Evaluation of the quality of fit of flexible bolus material created using 3D printing technology
CONCLUSION: This evaluation demonstrates that 3D printed bolus, created using semi-flexible materials such as TPU, is an effective and practical bolus choice for radiotherapy. In particular, using a 3D printed approach for H&N, scalp, and extremities was found to have a highly conformal fit.PMID:35048501 | DOI:10.1002/acm2.13490 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 20, 2022 Category: Physics Authors: Ciaran Malone Elaine Gill Tanith Lott Catherine Rogerson Sinead Keogh Majed Mousli Denise Carroll Caitriona Kelly John Gaffney Brendan McClean Source Type: research

A uniform and versatile surface-guided radiotherapy procedure and workflow for high-quality breast deep-inspiration breath-hold treatment in a multi-center institution
CONCLUSION: The uniform and versatile breast SGRT DIBH procedure and workflow have been developed to ensure smooth and optimal clinical operations, simplify clinical staff training and clinical troubleshooting, and allow high-quality SGRT delivery in a busy multi-center institution.PMID:35049108 | DOI:10.1002/acm2.13511 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 20, 2022 Category: Physics Authors: Guang Li Wei Lu Kyle O'Grady Iris Yan Ellen Yorke Laura I Cervino Arriba Simon Powell Linda Hong Source Type: research

A method for time-independent film dosimetry: Can we obtain accurate patient-specific QA results at any time postirradiation?
CONCLUSIONS: We have developed a methodology that allows radiochromic film to be accurately used as a dosimeter at any arbitrary scan postirradiation time, whereas previously, waiting periods of 16-24 h before readout were needed to ensure the postirradiation changes had stabilized. The creation of a TCM can enable results from radiochromic film measurements to be obtained quickly postirradiation. Using a conventional single calibration curve generated at 20 h postirradiation can result in gamma pass-rate difference of up to 75% for measurement films scanned at a much shorter postirradiation time.PMID:35049118 | DOI:10.100...
Source: Journal of Applied Clinical Medical Physics - January 20, 2022 Category: Physics Authors: Leon Dunn Guy Godwin James Hellyer Xiaolei Xu Source Type: research

Intra-fractional motion error during HyperArc stereotactic radiosurgery on patients with brain metastases: Comparison of open and full-face clamshell-style immobilization devices
CONCLUSIONS: The IME during STI using open- and full-face clamshell-style immobilization devices is approximately equal considering the adequate accuracy in patient positioning.PMID:35049125 | DOI:10.1002/acm2.13536 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 20, 2022 Category: Physics Authors: Shingo Ohira Riho Komiyama Naoyuki Kanayama Yoshihiro Ueda Shoki Inui Masayoshi Miyazaki Masahiko Koizumi Koji Konishi Source Type: research

Optimization of < sup > 99m < /sup > Tc whole-body SPECT/CT image quality: A phantom study
CONCLUSION: Optimized reconstruction parameters preserved image quality with reduce acquisition time in present study. This study suggests an optimal protocol for clinical 99m Tc SPECT/CT can be reached at 8 s per projection angle, with data reconstructed using 12 iterations and eight subset of the 3D OSEM algorithm and 8 mm Gaussian post-filter.PMID:35049129 | DOI:10.1002/acm2.13528 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 20, 2022 Category: Physics Authors: Mansour M Alqahtani Kathy P Willowson Chris Constable Roger Fulton Peter L Kench Source Type: research

Head and neck cancer patient positioning using synthetic CT data in MRI-only radiation therapy
This study included 14 H&N cancer patients, with generated sCT data (MRI Planner v2.2) and the CT deformably registered to the MRI. Patient positioning was evaluated by comparing sCT against CT data: 3D cone beam CT (CBCT) was registered to the deformed CT (dCT) and sCT in six degrees of freedom (DoF) with a rigid auto-registration algorithm and bone threshold, and 2D deformed digital reconstructed radiographs (dDRR) and synthetic DRRs (sDRR) were manually registered to orthogonal projections in five DoF by six blinded observers. The difference in displacement in all DoF were calculated for dCT and sCT, as well as for ...
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Emilia Palm ér Fredrik Nordstr öm Anna Karlsson Karin Petruson Maria Ljungberg Maja Sohlin Source Type: research

Target margin design through analyzing a large cohort of clinical log data in the cyberknife system
CONCLUSIONS: The current study can address two limitations in previous researches, namely insufficient sample sites and a smaller number of patients. A comparison of the present results concerning the lung and abdomen areas with other studies reveals that the proposed strategy could provide a better reference in selection the PTV margins. To our knowledge, this study is one of the first attempts to estimate the PTV margins in the lung and abdomen regions for a large cohort of patients treated using the Cyberknife system.PMID:35044071 | DOI:10.1002/acm2.13476 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Payam Samadi Miandoab Shahyar Saramad Saeed Setayeshi Source Type: research

Deep learning-based convolutional neural network for intramodality brain MRI synthesis
CONCLUSIONS: Our U-Net model exhibited that it can accurately perform image-to-image translation across brain MRI contrasts. It could hold great promise for clinical use for improved clinical decision-making and better diagnosis of brain cancer patients due to the availability of multicontrast MRIs. This approach may be clinically relevant and setting a significant step to efficiently fill a gap of absent MR sequences without additional scanning.PMID:35044073 | DOI:10.1002/acm2.13530 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Alexander F I Osman Nissren M Tamam Source Type: research

A pilot study of function-based radiation therapy planning for lung cancer using hyperpolarized xenon-129 ventilation MRI
J Appl Clin Med Phys. 2022 Jan 19:e13502. doi: 10.1002/acm2.13502. Online ahead of print.ABSTRACTPURPOSE: Radiation-induced lung injury (RILI) is a common side effect in patients with non-small cell lung cancer (NSCLC) treated with radiotherapy. Minimizing irradiation into highly functional areas of the lung may reduce the occurrence of RILI. The aim of this study is to evaluate the feasibility and utility of hyperpolarized xenon-129 magnetic resonance imaging (MRI), an imaging tool for evaluation of the pulmonary function, to guide radiotherapy planning.METHODS: Ten locally advanced NSCLC patients were recruited. Each pat...
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Yi Ding Lu Yang Qian Zhou Jianping Bi Ying Li Guoliang Pi Wei Wei Desheng Hu Qiuchen Rao Haidong Li Li Zhao An Liu Dongsu Du Xiao Wang Xin Zhou Guang Han Kun Qing Source Type: research

Dosimetric advantages of daily adaptive strategy in IMPT for high-risk prostate cancer
J Appl Clin Med Phys. 2022 Jan 19:e13531. doi: 10.1002/acm2.13531. Online ahead of print.ABSTRACTPURPOSE: To evaluate the dosimetric advantages of daily adaptive radiotherapy (DART) in intensity-modulated proton therapy (IMPT) for high-risk prostate cancer by comparing estimated doses of the conventional non-adaptive radiotherapy (NART) that irradiates according to an original treatment plan through the entire treatment and the DART that uses an adaptive treatment plan generated by using daily CT images acquired before each treatment.METHODS: Twenty-three patients with prostate cancer were included. A treatment plan with 6...
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Hiroshi Tamura Keiji Kobashi Kentaro Nishioka Takaaki Yoshimura Takayuki Hashimoto Shinichi Shimizu Yoichi M Ito Yoshikazu Maeda Makoto Sasaki Kazutaka Yamamoto Hiroyasu Tamamura Hidefumi Aoyama Hiroki Shirato Source Type: research

Estimating radiation exposure of the brain of a physician with a protective flap in interventional radiology: A phantom study
CONCLUSIONS: At the left anterior oblique in interventional radiology, the flap can reduce exposure to the brain.PMID:35045212 | DOI:10.1002/acm2.13532 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Shota Hattori Hajime Monzen Mikoto Tamura Hiroyuki Kosaka Yasunori Nakamura Yasumasa Nishimura Source Type: research

Head and neck cancer patient positioning using synthetic CT data in MRI-only radiation therapy
This study included 14 H&N cancer patients, with generated sCT data (MRI Planner v2.2) and the CT deformably registered to the MRI. Patient positioning was evaluated by comparing sCT against CT data: 3D cone beam CT (CBCT) was registered to the deformed CT (dCT) and sCT in six degrees of freedom (DoF) with a rigid auto-registration algorithm and bone threshold, and 2D deformed digital reconstructed radiographs (dDRR) and synthetic DRRs (sDRR) were manually registered to orthogonal projections in five DoF by six blinded observers. The difference in displacement in all DoF were calculated for dCT and sCT, as well as for ...
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Emilia Palm ér Fredrik Nordstr öm Anna Karlsson Karin Petruson Maria Ljungberg Maja Sohlin Source Type: research

Target margin design through analyzing a large cohort of clinical log data in the cyberknife system
CONCLUSIONS: The current study can address two limitations in previous researches, namely insufficient sample sites and a smaller number of patients. A comparison of the present results concerning the lung and abdomen areas with other studies reveals that the proposed strategy could provide a better reference in selection the PTV margins. To our knowledge, this study is one of the first attempts to estimate the PTV margins in the lung and abdomen regions for a large cohort of patients treated using the Cyberknife system.PMID:35044071 | DOI:10.1002/acm2.13476 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Payam Samadi Miandoab Shahyar Saramad Saeed Setayeshi Source Type: research

Deep learning-based convolutional neural network for intramodality brain MRI synthesis
CONCLUSIONS: Our U-Net model exhibited that it can accurately perform image-to-image translation across brain MRI contrasts. It could hold great promise for clinical use for improved clinical decision-making and better diagnosis of brain cancer patients due to the availability of multicontrast MRIs. This approach may be clinically relevant and setting a significant step to efficiently fill a gap of absent MR sequences without additional scanning.PMID:35044073 | DOI:10.1002/acm2.13530 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Alexander F I Osman Nissren M Tamam Source Type: research

A pilot study of function-based radiation therapy planning for lung cancer using hyperpolarized xenon-129 ventilation MRI
J Appl Clin Med Phys. 2022 Jan 19:e13502. doi: 10.1002/acm2.13502. Online ahead of print.ABSTRACTPURPOSE: Radiation-induced lung injury (RILI) is a common side effect in patients with non-small cell lung cancer (NSCLC) treated with radiotherapy. Minimizing irradiation into highly functional areas of the lung may reduce the occurrence of RILI. The aim of this study is to evaluate the feasibility and utility of hyperpolarized xenon-129 magnetic resonance imaging (MRI), an imaging tool for evaluation of the pulmonary function, to guide radiotherapy planning.METHODS: Ten locally advanced NSCLC patients were recruited. Each pat...
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Yi Ding Lu Yang Qian Zhou Jianping Bi Ying Li Guoliang Pi Wei Wei Desheng Hu Qiuchen Rao Haidong Li Li Zhao An Liu Dongsu Du Xiao Wang Xin Zhou Guang Han Kun Qing Source Type: research

Dosimetric advantages of daily adaptive strategy in IMPT for high-risk prostate cancer
J Appl Clin Med Phys. 2022 Jan 19:e13531. doi: 10.1002/acm2.13531. Online ahead of print.ABSTRACTPURPOSE: To evaluate the dosimetric advantages of daily adaptive radiotherapy (DART) in intensity-modulated proton therapy (IMPT) for high-risk prostate cancer by comparing estimated doses of the conventional non-adaptive radiotherapy (NART) that irradiates according to an original treatment plan through the entire treatment and the DART that uses an adaptive treatment plan generated by using daily CT images acquired before each treatment.METHODS: Twenty-three patients with prostate cancer were included. A treatment plan with 6...
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Hiroshi Tamura Keiji Kobashi Kentaro Nishioka Takaaki Yoshimura Takayuki Hashimoto Shinichi Shimizu Yoichi M Ito Yoshikazu Maeda Makoto Sasaki Kazutaka Yamamoto Hiroyasu Tamamura Hidefumi Aoyama Hiroki Shirato Source Type: research

Estimating radiation exposure of the brain of a physician with a protective flap in interventional radiology: A phantom study
CONCLUSIONS: At the left anterior oblique in interventional radiology, the flap can reduce exposure to the brain.PMID:35045212 | DOI:10.1002/acm2.13532 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 19, 2022 Category: Physics Authors: Shota Hattori Hajime Monzen Mikoto Tamura Hiroyuki Kosaka Yasunori Nakamura Yasumasa Nishimura Source Type: research

The need for dedicated time for medical physicists practice quality improvement efforts in radiation oncology department: A commentary
J Appl Clin Med Phys. 2022 Jan 18. doi: 10.1002/acm2.13515. Online ahead of print.NO ABSTRACTPMID:35040244 | DOI:10.1002/acm2.13515 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 18, 2022 Category: Physics Authors: Richard Zellars Christopher Njeh Scott Marquette Source Type: research

Artificial intelligence can overcome challenges in brachytherapy treatment planning
J Appl Clin Med Phys. 2022 Jan;23(1):e13504. doi: 10.1002/acm2.13504.NO ABSTRACTPMID:35041263 | DOI:10.1002/acm2.13504 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 18, 2022 Category: Physics Authors: Xun Jia J Adam M Cunha Yi Rong Source Type: research

The measurement of entrance surface dose using optically stimulated luminescence dosimeters for determining average glandular dose in digital breast tomosynthesis: Measurement and simulation study
This study aimed to evaluate the feasibility of using optically stimulated luminescence dosimeters (OSLDs), nanoDots, for the determination of an average glandular dose (AGD) with a specific digital breast tomosynthesis (DBT) system, whereas the X-ray tube was fixed (2D mode) and moved (3D mode). The entrance surface air kerma (ESAK) was measured by placing the nanoDots on the surface of a polymethyl methacrylate (PMMA) phantom with 25, 28, and 34 kV W/Rh techniques. The experimental setup of the ESAK measurement was simulated using a Monte Carlo simulation code to determine the ESAK and the backscatter factor (BSF). The A...
Source: Journal of Applied Clinical Medical Physics - January 18, 2022 Category: Physics Authors: Thunyarat Chusin Sumalee Yabsantia Kosuke Matsubara Source Type: research

The need for dedicated time for medical physicists practice quality improvement efforts in radiation oncology department: A commentary
J Appl Clin Med Phys. 2022 Jan 18. doi: 10.1002/acm2.13515. Online ahead of print.NO ABSTRACTPMID:35040244 | DOI:10.1002/acm2.13515 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 18, 2022 Category: Physics Authors: Richard Zellars Christopher Njeh Scott Marquette Source Type: research

Reproducibility of deep inspiration breath-hold technique for left-side breast cancer with respiratory monitoring device, Abches
CONCLUSION: Our study showed that DIBH using Abches can be performed with good target reproducibility of less than 3 mm with proper breath-hold practice, whereas the heartbeat-derived reproducibility of the cardiac position is poor and needs to be monitored carefully during treatment simulation.PMID:35018712 | DOI:10.1002/acm2.13529 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 12, 2022 Category: Physics Authors: Masahide Saito Daichi Kajihara Hidekazu Suzuki Takafumi Komiyama Kan Marino Shinichi Aoki Koji Ueda Naoki Sano Hiroshi Onishi Source Type: research

Quality assurance for on-table adaptive magnetic resonance guided radiation therapy: A software tool to complement secondary dose calculation and failure modes discovered in clinical routine
J Appl Clin Med Phys. 2022 Jan 12:e13523. doi: 10.1002/acm2.13523. Online ahead of print.ABSTRACTOnline adaption of treatment plans on a magnetic resonance (MR)-Linac enables the daily creation of new (adapted) treatment plans using current anatomical information of the patient as seen on MR images. Plan quality assurance (QA) relies on a secondary dose calculation (SDC) that is required because a pretreatment measurement is impossible during the adaptive workflow. However, failure mode and effect analysis of the adaptive planning process shows a large number of error sources, and not all of them are covered by SDC. As the...
Source: Journal of Applied Clinical Medical Physics - January 12, 2022 Category: Physics Authors: Carolin Rippke Oliver Schrenk C Katharina Renkamp Carolin Buchele Juliane H örner-Rieber J ürgen Debus Markus Alber Sebastian Kl üter Source Type: research

Reproducibility of deep inspiration breath-hold technique for left-side breast cancer with respiratory monitoring device, Abches
CONCLUSION: Our study showed that DIBH using Abches can be performed with good target reproducibility of less than 3 mm with proper breath-hold practice, whereas the heartbeat-derived reproducibility of the cardiac position is poor and needs to be monitored carefully during treatment simulation.PMID:35018712 | DOI:10.1002/acm2.13529 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 12, 2022 Category: Physics Authors: Masahide Saito Daichi Kajihara Hidekazu Suzuki Takafumi Komiyama Kan Marino Shinichi Aoki Koji Ueda Naoki Sano Hiroshi Onishi Source Type: research

Quality assurance for on-table adaptive magnetic resonance guided radiation therapy: A software tool to complement secondary dose calculation and failure modes discovered in clinical routine
J Appl Clin Med Phys. 2022 Jan 12:e13523. doi: 10.1002/acm2.13523. Online ahead of print.ABSTRACTOnline adaption of treatment plans on a magnetic resonance (MR)-Linac enables the daily creation of new (adapted) treatment plans using current anatomical information of the patient as seen on MR images. Plan quality assurance (QA) relies on a secondary dose calculation (SDC) that is required because a pretreatment measurement is impossible during the adaptive workflow. However, failure mode and effect analysis of the adaptive planning process shows a large number of error sources, and not all of them are covered by SDC. As the...
Source: Journal of Applied Clinical Medical Physics - January 12, 2022 Category: Physics Authors: Carolin Rippke Oliver Schrenk C Katharina Renkamp Carolin Buchele Juliane H örner-Rieber J ürgen Debus Markus Alber Sebastian Kl üter Source Type: research

Reproducibility of deep inspiration breath-hold technique for left-side breast cancer with respiratory monitoring device, Abches
CONCLUSION: Our study showed that DIBH using Abches can be performed with good target reproducibility of less than 3 mm with proper breath-hold practice, whereas the heartbeat-derived reproducibility of the cardiac position is poor and needs to be monitored carefully during treatment simulation.PMID:35018712 | DOI:10.1002/acm2.13529 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 12, 2022 Category: Physics Authors: Masahide Saito Daichi Kajihara Hidekazu Suzuki Takafumi Komiyama Kan Marino Shinichi Aoki Koji Ueda Naoki Sano Hiroshi Onishi Source Type: research

Quality assurance for on-table adaptive magnetic resonance guided radiation therapy: A software tool to complement secondary dose calculation and failure modes discovered in clinical routine
J Appl Clin Med Phys. 2022 Jan 12:e13523. doi: 10.1002/acm2.13523. Online ahead of print.ABSTRACTOnline adaption of treatment plans on a magnetic resonance (MR)-Linac enables the daily creation of new (adapted) treatment plans using current anatomical information of the patient as seen on MR images. Plan quality assurance (QA) relies on a secondary dose calculation (SDC) that is required because a pretreatment measurement is impossible during the adaptive workflow. However, failure mode and effect analysis of the adaptive planning process shows a large number of error sources, and not all of them are covered by SDC. As the...
Source: Journal of Applied Clinical Medical Physics - January 12, 2022 Category: Physics Authors: Carolin Rippke Oliver Schrenk C Katharina Renkamp Carolin Buchele Juliane H örner-Rieber J ürgen Debus Markus Alber Sebastian Kl üter Source Type: research

Reproducibility of deep inspiration breath-hold technique for left-side breast cancer with respiratory monitoring device, Abches
CONCLUSION: Our study showed that DIBH using Abches can be performed with good target reproducibility of less than 3 mm with proper breath-hold practice, whereas the heartbeat-derived reproducibility of the cardiac position is poor and needs to be monitored carefully during treatment simulation.PMID:35018712 | DOI:10.1002/acm2.13529 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 12, 2022 Category: Physics Authors: Masahide Saito Daichi Kajihara Hidekazu Suzuki Takafumi Komiyama Kan Marino Shinichi Aoki Koji Ueda Naoki Sano Hiroshi Onishi Source Type: research

Quality assurance for on-table adaptive magnetic resonance guided radiation therapy: A software tool to complement secondary dose calculation and failure modes discovered in clinical routine
J Appl Clin Med Phys. 2022 Jan 12:e13523. doi: 10.1002/acm2.13523. Online ahead of print.ABSTRACTOnline adaption of treatment plans on a magnetic resonance (MR)-Linac enables the daily creation of new (adapted) treatment plans using current anatomical information of the patient as seen on MR images. Plan quality assurance (QA) relies on a secondary dose calculation (SDC) that is required because a pretreatment measurement is impossible during the adaptive workflow. However, failure mode and effect analysis of the adaptive planning process shows a large number of error sources, and not all of them are covered by SDC. As the...
Source: Journal of Applied Clinical Medical Physics - January 12, 2022 Category: Physics Authors: Carolin Rippke Oliver Schrenk C Katharina Renkamp Carolin Buchele Juliane H örner-Rieber J ürgen Debus Markus Alber Sebastian Kl üter Source Type: research

Reproducibility of deep inspiration breath-hold technique for left-side breast cancer with respiratory monitoring device, Abches
CONCLUSION: Our study showed that DIBH using Abches can be performed with good target reproducibility of less than 3 mm with proper breath-hold practice, whereas the heartbeat-derived reproducibility of the cardiac position is poor and needs to be monitored carefully during treatment simulation.PMID:35018712 | DOI:10.1002/acm2.13529 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 12, 2022 Category: Physics Authors: Masahide Saito Daichi Kajihara Hidekazu Suzuki Takafumi Komiyama Kan Marino Shinichi Aoki Koji Ueda Naoki Sano Hiroshi Onishi Source Type: research

Quality assurance for on-table adaptive magnetic resonance guided radiation therapy: A software tool to complement secondary dose calculation and failure modes discovered in clinical routine
J Appl Clin Med Phys. 2022 Jan 12:e13523. doi: 10.1002/acm2.13523. Online ahead of print.ABSTRACTOnline adaption of treatment plans on a magnetic resonance (MR)-Linac enables the daily creation of new (adapted) treatment plans using current anatomical information of the patient as seen on MR images. Plan quality assurance (QA) relies on a secondary dose calculation (SDC) that is required because a pretreatment measurement is impossible during the adaptive workflow. However, failure mode and effect analysis of the adaptive planning process shows a large number of error sources, and not all of them are covered by SDC. As the...
Source: Journal of Applied Clinical Medical Physics - January 12, 2022 Category: Physics Authors: Carolin Rippke Oliver Schrenk C Katharina Renkamp Carolin Buchele Juliane H örner-Rieber J ürgen Debus Markus Alber Sebastian Kl üter Source Type: research

Replacing gamma knife beam-profiles on film with point-detector scans
CONCLUSIONS: Small-volume field detectors, used in conjunction with a clinically available phantom, an electrometer with data-logging, and treatment plans created in clinical mode offer an efficient and viable alternative for film-based profile tests. Position verification can be accurately performed when CBCT-imaging is available to correct for residual detector-position uncertainty. Scans are easily set up within the treatment-planning-system and, when coupled with an automated analysis, can provide accurate measurements within minutes.PMID:35001499 | DOI:10.1002/acm2.13522 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 10, 2022 Category: Physics Authors: Benedikt Rudek Kenneth Bernstein Sunshine Osterman Tanxia Qu Source Type: research

Investigation of Halcyon multi-leaf collimator model in Eclipse treatment planning system: A focus on the VMAT dose calculation with the Acuros XB algorithm
CONCLUSION: No significant change was confirmed in the dose calculation accuracy between the leaf sequences. Therefore, it is suggested that the dosimetric consequence due to the leaf trailing was negligibly small in clinical VMAT plans. The DLG tuning for Halcyon can be useful for reducing the dose calculation uncertainties in Eclipse VMAT and required in the commissioning for Acuros XB.PMID:35001518 | DOI:10.1002/acm2.13519 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 10, 2022 Category: Physics Authors: Ryohei Miyasaka SangYong Cho Takuya Hiraoka Kohei Chiba Toru Kawachi Tetsurou Katayose Yuhi Suda Ryusuke Hara Source Type: research

Replacing gamma knife beam-profiles on film with point-detector scans
CONCLUSIONS: Small-volume field detectors, used in conjunction with a clinically available phantom, an electrometer with data-logging, and treatment plans created in clinical mode offer an efficient and viable alternative for film-based profile tests. Position verification can be accurately performed when CBCT-imaging is available to correct for residual detector-position uncertainty. Scans are easily set up within the treatment-planning-system and, when coupled with an automated analysis, can provide accurate measurements within minutes.PMID:35001499 | DOI:10.1002/acm2.13522 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 10, 2022 Category: Physics Authors: Benedikt Rudek Kenneth Bernstein Sunshine Osterman Tanxia Qu Source Type: research

Investigation of Halcyon multi-leaf collimator model in Eclipse treatment planning system: A focus on the VMAT dose calculation with the Acuros XB algorithm
CONCLUSION: No significant change was confirmed in the dose calculation accuracy between the leaf sequences. Therefore, it is suggested that the dosimetric consequence due to the leaf trailing was negligibly small in clinical VMAT plans. The DLG tuning for Halcyon can be useful for reducing the dose calculation uncertainties in Eclipse VMAT and required in the commissioning for Acuros XB.PMID:35001518 | DOI:10.1002/acm2.13519 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 10, 2022 Category: Physics Authors: Ryohei Miyasaka SangYong Cho Takuya Hiraoka Kohei Chiba Toru Kawachi Tetsurou Katayose Yuhi Suda Ryusuke Hara Source Type: research

Brain stereotactic radiosurgery using MR-guided online adaptive planning for daily setup variation: An end-to-end test
J Appl Clin Med Phys. 2022 Jan 7:e13518. doi: 10.1002/acm2.13518. Online ahead of print.ABSTRACTOnline magnetic resonance (MR)-guided radiotherapy is expected to benefit brain stereotactic radiosurgery (SRS) due to superior soft tissue contrast and capability of daily adaptive planning. The purpose of this study was to investigate daily adaptive plan quality with setup variations and to perform an end-to-end test for brain SRS with multiple metastases treated with a 1.5-Tesla MR-Linac (MRL). The RTsafe PseudoPatient Prime brain phantom was used with a delineation insert that includes two predefined structures mimicking gad...
Source: Journal of Applied Clinical Medical Physics - January 7, 2022 Category: Physics Authors: Eun Young Han He Wang Tina Marie Briere Debra Nana Yeboa Themistoklis Boursianis Georgios Kalaitzakis Evangelos Pappas Pamela Castillo Jinzhong Yang Source Type: research

Brain stereotactic radiosurgery using MR-guided online adaptive planning for daily setup variation: An end-to-end test
J Appl Clin Med Phys. 2022 Jan 7:e13518. doi: 10.1002/acm2.13518. Online ahead of print.ABSTRACTOnline magnetic resonance (MR)-guided radiotherapy is expected to benefit brain stereotactic radiosurgery (SRS) due to superior soft tissue contrast and capability of daily adaptive planning. The purpose of this study was to investigate daily adaptive plan quality with setup variations and to perform an end-to-end test for brain SRS with multiple metastases treated with a 1.5-Tesla MR-Linac (MRL). The RTsafe PseudoPatient Prime brain phantom was used with a delineation insert that includes two predefined structures mimicking gad...
Source: Journal of Applied Clinical Medical Physics - January 7, 2022 Category: Physics Authors: Eun Young Han He Wang Tina Marie Briere Debra Nana Yeboa Themistoklis Boursianis Georgios Kalaitzakis Evangelos Pappas Pamela Castillo Jinzhong Yang Source Type: research

Small spot size versus large spot size: Effect on plan quality for lung cancer in pencil beam scanning proton therapy
CONCLUSION: For robustly optimized PBS lung cancer plans in our study, a small spot machine resulted in a more robust CTV against the setup and range errors when compared to a large spot machine. In the absence of volumetric repainting, large spot PBS lung plans were more robust against the interplay effect. The use of a volumetric repainting technique in both small and large spot PBS lung plans led to comparable interplay target coverage.PMID:34989458 | DOI:10.1002/acm2.13512 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 6, 2022 Category: Physics Authors: Suresh Rana Anatoly B Rosenfeld Source Type: research

Accuracy evaluation of surface registration algorithm using normal distribution transform in stereotactic body radiotherapy/radiosurgery: A phantom study
J Appl Clin Med Phys. 2022 Jan 5. doi: 10.1002/acm2.13521. Online ahead of print.ABSTRACTPURPOSE: To evaluate a feasibility of normal distribution transform (NDT) algorithm compared with the iterative closest point (ICP) method as a useful surface registration in stereotactic body radiotherapy (SBRT)/stereotactic radiosurgery (SRS).METHODS: Point cloud images using the 3D triangulation technology were obtained from a depth camera-based optical imaging (OSI) system equipped in a radiosurgery room. Two surface registration algorithms, NDT and ICP, were used to measure and compare the discrepancy values between the reference ...
Source: Journal of Applied Clinical Medical Physics - January 5, 2022 Category: Physics Authors: Haenghwa Lee Jeong-Mee Park Kwang Hyeon Kim Dong-Hoon Lee Moon-Jun Sohn Source Type: research

Effect of total body irradiation lung block parameters on lung doses using three-dimensional dosimetry
CONCLUSIONS: The TPS-derived 3D lung dose is substantially different from the nominal dose assumed with HVL lung blocks. Point doses under the block are insufficient to accurately gauge the relationship between dose and pneumonitis, and TBI dosimetry could be highly variable between patients and institutions as more descriptive parameters are not included in protocols. Much progress remains to be made to optimize and standardize technical aspects of TBI, and better dosimetry could provide more precise dosimetric predictors for pneumonitis risk.PMID:34985180 | DOI:10.1002/acm2.13513 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - January 5, 2022 Category: Physics Authors: Samuel M H Luk Kent Wallner Mallory C Glenn Ralph Ermoian Mark H Phillips Yolanda D Tseng Minsun Kim Source Type: research

Augmented reality-guided positioning system for radiotherapy patients
J Appl Clin Med Phys. 2022 Jan 5. doi: 10.1002/acm2.13516. Online ahead of print.ABSTRACTIn modern radiotherapy, error reduction in the patients' daily setup error is important for achieving accuracy. In our study, we proposed a new approach for the development of an assist system for the radiotherapy position setup by using augmented reality (AR). We aimed to improve the accuracy of the position setup of patients undergoing radiotherapy and to evaluate the error of the position setup of patients who were diagnosed with head and neck cancer, and that of patients diagnosed with chest and abdomen cancer. We acquired the pati...
Source: Journal of Applied Clinical Medical Physics - January 5, 2022 Category: Physics Authors: Chunying Li Zhengda Lu Mu He Jianfeng Sui Tao Lin Kai Xie Jiawei Sun Xinye Ni Source Type: research

Quantitative assessment of intra- and inter-modality deformable image registration of the heart, left ventricle, and thoracic aorta on longitudinal 4D-CT and MR images
CONCLUSIONS: DIR of the heart, LV, and TA between non-cardiac-gated longitudinal 4D-CT and MRI across two modalities, breathing phases, and pre/post-contrast is acceptably accurate per AAPM TG-132 guidelines. This study paves the way for future evaluation of RT-induced cardiotoxicity and its related factors using multimodality DIR.PMID:34962065 | DOI:10.1002/acm2.13500 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - December 28, 2021 Category: Physics Authors: Alireza Omidi Elisabeth Weiss John S Wilson Mihaela Rosu-Bubulac Source Type: research

Quantitative assessment of intra- and inter-modality deformable image registration of the heart, left ventricle, and thoracic aorta on longitudinal 4D-CT and MR images
CONCLUSIONS: DIR of the heart, LV, and TA between non-cardiac-gated longitudinal 4D-CT and MRI across two modalities, breathing phases, and pre/post-contrast is acceptably accurate per AAPM TG-132 guidelines. This study paves the way for future evaluation of RT-induced cardiotoxicity and its related factors using multimodality DIR.PMID:34962065 | DOI:10.1002/acm2.13500 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - December 28, 2021 Category: Physics Authors: Alireza Omidi Elisabeth Weiss John S Wilson Mihaela Rosu-Bubulac Source Type: research

Quantitative assessment of intra- and inter-modality deformable image registration of the heart, left ventricle, and thoracic aorta on longitudinal 4D-CT and MR images
CONCLUSIONS: DIR of the heart, LV, and TA between non-cardiac-gated longitudinal 4D-CT and MRI across two modalities, breathing phases, and pre/post-contrast is acceptably accurate per AAPM TG-132 guidelines. This study paves the way for future evaluation of RT-induced cardiotoxicity and its related factors using multimodality DIR.PMID:34962065 | DOI:10.1002/acm2.13500 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - December 28, 2021 Category: Physics Authors: Alireza Omidi Elisabeth Weiss John S Wilson Mihaela Rosu-Bubulac Source Type: research

Quantitative assessment of intra- and inter-modality deformable image registration of the heart, left ventricle, and thoracic aorta on longitudinal 4D-CT and MR images
CONCLUSIONS: DIR of the heart, LV, and TA between non-cardiac-gated longitudinal 4D-CT and MRI across two modalities, breathing phases, and pre/post-contrast is acceptably accurate per AAPM TG-132 guidelines. This study paves the way for future evaluation of RT-induced cardiotoxicity and its related factors using multimodality DIR.PMID:34962065 | DOI:10.1002/acm2.13500 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - December 28, 2021 Category: Physics Authors: Alireza Omidi Elisabeth Weiss John S Wilson Mihaela Rosu-Bubulac Source Type: research

Quantitative assessment of intra- and inter-modality deformable image registration of the heart, left ventricle, and thoracic aorta on longitudinal 4D-CT and MR images
CONCLUSIONS: DIR of the heart, LV, and TA between non-cardiac-gated longitudinal 4D-CT and MRI across two modalities, breathing phases, and pre/post-contrast is acceptably accurate per AAPM TG-132 guidelines. This study paves the way for future evaluation of RT-induced cardiotoxicity and its related factors using multimodality DIR.PMID:34962065 | DOI:10.1002/acm2.13500 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - December 28, 2021 Category: Physics Authors: Alireza Omidi Elisabeth Weiss John S Wilson Mihaela Rosu-Bubulac Source Type: research

Quantitative assessment of intra- and inter-modality deformable image registration of the heart, left ventricle, and thoracic aorta on longitudinal 4D-CT and MR images
CONCLUSIONS: DIR of the heart, LV, and TA between non-cardiac-gated longitudinal 4D-CT and MRI across two modalities, breathing phases, and pre/post-contrast is acceptably accurate per AAPM TG-132 guidelines. This study paves the way for future evaluation of RT-induced cardiotoxicity and its related factors using multimodality DIR.PMID:34962065 | DOI:10.1002/acm2.13500 (Source: Journal of Applied Clinical Medical Physics)
Source: Journal of Applied Clinical Medical Physics - December 28, 2021 Category: Physics Authors: Alireza Omidi Elisabeth Weiss John S Wilson Mihaela Rosu-Bubulac Source Type: research

Image quality and acquisition time assessments for phase oversampling in compressed sensing sensitivity encoding: Comparison with conventional SENSE
This study compared sensitivity encoding (SENSE) and compressed sensing sensitivity encoding (CS-SENSE) for phase oversampling distance and assessed its impact on image quality and image acquisition time. The experiment was performed with a large diameter phantom using 16-channel anterior body coils. All imaging data were divided into three groups according to the parallel imaging technique and oversampling distances: groups A (SENSE with phase oversampling distance of 150 mm), B (CS-SENSE with phase oversampling distance of 100 mm), and C (CS-SENSE with phase oversampling distance of 75 mm). No statistically significant d...
Source: Journal of Applied Clinical Medical Physics - December 25, 2021 Category: Physics Authors: Ji Sung Jang Ho Beom Lee Chong Hyun Suh Min Hee Lee Source Type: research

Image quality and acquisition time assessments for phase oversampling in compressed sensing sensitivity encoding: Comparison with conventional SENSE
This study compared sensitivity encoding (SENSE) and compressed sensing sensitivity encoding (CS-SENSE) for phase oversampling distance and assessed its impact on image quality and image acquisition time. The experiment was performed with a large diameter phantom using 16-channel anterior body coils. All imaging data were divided into three groups according to the parallel imaging technique and oversampling distances: groups A (SENSE with phase oversampling distance of 150 mm), B (CS-SENSE with phase oversampling distance of 100 mm), and C (CS-SENSE with phase oversampling distance of 75 mm). No statistically significant d...
Source: Journal of Applied Clinical Medical Physics - December 25, 2021 Category: Physics Authors: Ji Sung Jang Ho Beom Lee Chong Hyun Suh Min Hee Lee Source Type: research

Image quality and acquisition time assessments for phase oversampling in compressed sensing sensitivity encoding: Comparison with conventional SENSE
This study compared sensitivity encoding (SENSE) and compressed sensing sensitivity encoding (CS-SENSE) for phase oversampling distance and assessed its impact on image quality and image acquisition time. The experiment was performed with a large diameter phantom using 16-channel anterior body coils. All imaging data were divided into three groups according to the parallel imaging technique and oversampling distances: groups A (SENSE with phase oversampling distance of 150 mm), B (CS-SENSE with phase oversampling distance of 100 mm), and C (CS-SENSE with phase oversampling distance of 75 mm). No statistically significant d...
Source: Journal of Applied Clinical Medical Physics - December 25, 2021 Category: Physics Authors: Ji Sung Jang Ho Beom Lee Chong Hyun Suh Min Hee Lee Source Type: research