Simultaneous measurement of In vivo and transit mid-plane doses with ionization chambers in gynecological malignancy patients undergoing three-dimensional conformal radiotherapy
Conclusion: The fundamental importance of this study lies in simultaneous validation of delivered dose in real time with two methods. A study in this small number of patients has given the confidence to apply transit measurements for quality assurance on a routine basis as an accepted clinical dosimetry for the selected patients. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - July 19, 2020 Category: Physics Authors: Putha Suman Kumar Challapalli Srinivas BM Vadhiraja Sourjya Banerjee R Shreyas PU Prakash Saxena Ramamoorthy Ravichandran Dilson Lobo Source Type: research
Monte carlo calculation of the energy spectrum of a 6 MeV electron beam using penetration and energy loss of positrons and electrons code
Conclusion: It was demonstrated that PENELOPE is an attractive and accurate tool for the obtaining of dosimetric parameters of a medical linear accelerator since it can reliably reproduce important clinical data such as the energy spectrum, depth dose, and dose profile. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - July 19, 2020 Category: Physics Authors: Danny Giancarlo Apaza Veliz Jorge Homero Wilches Visbal Felipe Chen Abrego Jos & #233; Luis Vega Ram & #237;rez Source Type: research
Assessment of four scatter correction methods in In-111 SPECT imaging: A simulation study
Conclusion: The use of the proposed correction methods, by considering both the photopeak windows, leads to improve the image contrast with a reasonable level of image noise. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - July 19, 2020 Category: Physics Authors: Mahsa Noori-Asl Source Type: research
Appraisal of deep-learning techniques on computer-aided lung cancer diagnosis with computed tomography screening
Conclusions: Thus, the proposed CNN models achieve efficient lung segmentation and two-dimensional nodule patch classification in CAD system for lung cancer diagnosis with CT screening. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - July 19, 2020 Category: Physics Authors: S Akila Agnes J Anitha Source Type: research
Study of asymmetric margins in prostate cancer radiation therapy using fuzzy logic
Conclusion: The advantage of using knowledge based fuzzy logic is that a practical limitation on the margin size is included in the model for limiting the dose received by the critical organs. It uses both physical and radiobiological data to optimize the required margin as per clinical requirement in real time or adaptive planning, which is an improvement on most margin models which mainly rely on physical data only. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - July 19, 2020 Category: Physics Authors: Santosh Kumar Patnaikuni Sapan Mohan Saini Rakesh Mohan Chandola Pradeep Chandrakar Vivek Chaudhary Source Type: research
Evaluation of dose distribution and normal tissue complication probability of a combined dose of cone-beam computed tomography imaging with treatment in prostate intensity-modulated radiation therapy
Conclusions: This study demonstrated a method to evaluate a combined dose of CBCT and a treatment dose using the constructed system. The combined dose distribution revealed increases of <1% volume in the rectal and bladder doses and approximately 0.07% in the rectal NTCP. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - July 19, 2020 Category: Physics Authors: Tetsuya Tomita Tomonori Isobe Yoshinobu Furuyama Hideyuki Takei Daisuke Kobayashi Yutaro Mori Toshiyuki Terunuma Eisuke Sato Hiroshi Yokota Takeji Sakae Source Type: research
Influence of cleaned-up commercial knowledge-based treatment planning on volumetric-modulated arc therapy of prostate cancer
Conclusions: The cleaned-up KBP model based on DVH and regression plots improved plan quality in the PTV–rectum overlap region. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - July 19, 2020 Category: Physics Authors: Mikoto Tamura Hajime Monzen Kenji Matsumoto Kazuki Kubo Yoshihiro Ueda Tatsuya Kamima Masahiro Inada Hiroshi Doi Kiyoshi Nakamatsu Yasumasa Nishimura Source Type: research
Design, fabrication, and validation of a polymethyl methacrylate head phantom for dosimetric verification of cranial radiotherapy treatment plans
Conclusions: The dosimetric study reveals that head phantom can be used for routine pretreatment verification for the cranial RT, especially for stereotactic radiosurgery/RT as a part of patient-specific quality assurance. The presently fabricated and validated phantom is novel, versatile, and cost-effective, and many institutes can afford it. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - July 19, 2020 Category: Physics Authors: VS Shaiju Rajesh Kumar Debjani Phani KV Rajasekhar George Zacharia Saju Bhasi Raghuram K Nair Source Type: research
Characterization and performance evaluation of the first-proton therapy facility in India
Conclusion: The PT-system performed well within the expected accuracy level and consistent over a period of 8 months. The methodology and data presented here may help upcoming modern PT center during their crucial phase of commissioning. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - July 19, 2020 Category: Physics Authors: Dayananda Sharma Shamurailatpam A Manikandan K Ganapathy MP Noufal Kartikeshwar C Patro T Rajesh R Jalali Source Type: research
Investigation of different factors affecting the quality of spect images: A simulation study
Conclusion: The MC simulation is a suitable tool for investigation of different factors affecting the quality of SPECT images, essentially in the studies based on the energy spectrum, such as the evaluation of the scatter correction methods. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 12, 2020 Category: Physics Authors: Mahsa Noori-Asl Source Type: research
A method of high-resolution radiotherapy delivery fluences with a pair of fields with orthogonal collimator settings: A study on ten head-and-neck cancer patients
Conclusions: At the time of writing of this study, there were more than 12,000 medical linear accelerators in clinical use, and XMLC can prove itself useful wherever linac is equipped with MLC but cannot delivery latest techniques, such as volumetric modulated arc therapy. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 12, 2020 Category: Physics Authors: Stipe Galic Marin Kovacevic Ivan Lasic Hrvoje Brkic Dario Faj Source Type: research
Validation of PRIMO monte carlo model of clinac & #174;ix 6mv photon beam
Conclusions: This study shows that the research software PRIMO can be used as a treatment planning system-independent quality assurance and dose verification tool in daily clinical practice. Further validation will be performed with different energies, complex multileaf collimators fields, and with dynamic treatment fields. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 12, 2020 Category: Physics Authors: B Sarin B Bindhu B Saju Raguram K Nair Source Type: research
Development and validation of a matlab software program for decoding the treatment errors in real-time position management & #8482; Gating-generated breathing trace
Conclusion: The developed GUI gave the same and acceptable results for all regular profiles. These errors were due to the lag time of the linear accelerator with gating treatment. This program can be used as to quantifying the intrafraction “beam-on” errors in breathing trace with both mode of gating techniques for irregular breathing trace, and in addition, it is capable to convert phase-based gating parameters to amplitude-based gating parameters for treatment. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 12, 2020 Category: Physics Authors: Naveen Kumawat Anil Kumar Shrotriya Malhotra Singh Heigrujam Kartikeswar Patro Satendra Kumar Anil Kumar Bansal Ram Kishan Munjal Anil Kumar Anand Source Type: research
Dosimetric Comparison of treatment plans computed with finite size pencil beam and monte carlo algorithms using the incise & #8482; multileaf collimator-equipped cyberknife & #174; system
Conclusion: In this study, it was found that FSPB overestimates dose to inhomogeneous treatment sites. This indicates, the employment of MC algorithm in CK-MLC-based lung SABR treatment plans is strongly suggested. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 12, 2020 Category: Physics Authors: Kalpani Nisansala Udeni Galpayage Dona Charles Shang Theodora Leventouri Source Type: research
Volumetric arc therapy treatment plan dosimetry correction method to account patient weight loss during a course of radiation therapy
Conclusion: Image-guided radiation therapy process detects the weight loss, which affects the treatment plan's dose distribution and should be corrected. Applying the correction method described here keeps the patient dosimetry within 1% of the original plan, which is clinically acceptable. The process of plan dosimetry correction to address weight loss can be completed within 30 min without repeating imaging and planning process. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 12, 2020 Category: Physics Authors: Harold DSouza Henry Weatherburn Abhishek Dwivedi Tharmarnadar Ganesh Source Type: research
