A Model-based method for assessment of salivary gland and planning target volume dosimetry in volumetric-modulated arc therapy planning on head-and-neck cancer
This study examined the relationship of achievable mean dose and percent volumetric overlap of salivary gland with the planning target volume (PTV) in volumetric-modulated arc therapy (VMAT) plan in radiotherapy for a patient with head-and-neck cancer. The aim was to develop a model to predict the viability of planning objectives for both PTV coverage and organs-at-risk (OAR) sparing based on overlap volumes between PTVs and OARs, before the planning process. Forty patients with head-and-neck cancer were selected for this retrospective plan analysis. The patients were treated using 6 MV photons with 2-arc VMAT plan in pres...
Source: Journal of Medical Physics - September 12, 2019 Category: Physics Authors: Honglai Zhang Yijian Cao Jeffrey Antone Adam C Riegel Maged Ghaly Louis Potters Abolghassem Jamshidi Source Type: research
A novel design of N-fiducial phantom for automatic ultrasound calibration
Conclusions: The results showed that our proposed method has a high efficiency to perform automatic feature extraction compared to conventional extraction performed by humans. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - September 12, 2019 Category: Physics Authors: Maria Chatrasingh Jackrit Suthakorn Source Type: research
Correlation between biological effective dose and radiation-induced liver disease from hypofractionated radiotherapy
Conclusion: The strong correlations of the V10Gy and V15Gy PD-volume metrics as well as the V16.7Gy3(BED of V10Gy) to both classic and chronic RILD imply the appropriateness of the current 15Gy evaluation level for liver toxicity with hypo-fractionated treatments. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - September 12, 2019 Category: Physics Authors: Angelo M Bergamo Kevin Kauweloa Gregory Gan Zheng Shi Janeen Daniels Richard Crownover Ganesh Narayanasamy Sotirios Stathakis Panayiotis Mavroidis Niko Papanikolaou Alonso Gutierrez Source Type: research
Electronic portal imaging device-based three-dimensional volumetric dosimetry for intensity-modulated radiotherapy pretreatment quality assurance
Conclusion: The novel TPS-based heterogeneity correction can improve the 2D and 3D EPID-based back projection technique. Structures with large heterogeneities can also be handled using the proposed technique. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - September 12, 2019 Category: Physics Authors: Manikandan Arjunan Sureka Chandra Sekaran Biplab Sarkar Saran Kumar Manavalan Source Type: research
Out-of-field dose calculation by a commercial treatment planning system and comparison by monte carlo simulation for varian TrueBeam & #174;
Conclusion: In this work, it was observed that the TPS underestimates doses beyond the edges of treatment fields for a clinical treatment executed on a TB machine. This indicates that the out-of-field dose from TPSs should only be used with a clear understanding of the inaccuracy of dose calculations beyond the edge of the field. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - September 12, 2019 Category: Physics Authors: NS Shine Raghukumar Paramu M Gopinath RC Jaon Bos PM Jayadevan Source Type: research
An experimental slope method for a more accurate measurement of relative radiation doses using radiographic and radiochromic films and its application to megavoltage small-field dosimetry
Conclusions: The authors have developed a novel and more accurate method for the relative dosimetry of photon and electron beams. This offers a unique method to determine PDD and ROF with a high spatial resolution in fields of steep dose gradient, especially in small fields. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - September 12, 2019 Category: Physics Authors: Raghavendra Holla D Khanna Bhaskaran K Pillai KV Jafar Ali PS Renil Mon CO Clinto Tharmarnadar Ganesh Source Type: research
Basic physics and radiation safety in nuclear medicine
Ajai Kumar ShuklaJournal of Medical Physics 2019 44(2):142-143 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 10, 2019 Category: Physics Authors: Ajai Kumar Shukla Source Type: research
Clinical three-dimensional dosimetry in modern radiation therapy
Tharmarnadar GaneshJournal of Medical Physics 2019 44(2):139-141 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 10, 2019 Category: Physics Authors: Tharmarnadar Ganesh Source Type: research
External beam radiotherapy with telecobalt machine: Tissue deficiency compensation in head-and-neck region and effect on skin reactions
Ramamoorthy Ravichandran, Bandana Barman, Gopal Datta, Ravi KannanJournal of Medical Physics 2019 44(2):135-138 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 10, 2019 Category: Physics Authors: Ramamoorthy Ravichandran Bandana Barman Gopal Datta Ravi Kannan Source Type: research
Validation of the RapidArc delivery system using a volumetric phantom as per task group report 119 of the American association of physicists in medicine
Conclusion: Thus, the ArcCHECK can successfully be utilized for the validation of the RA delivery. The AXB has potential to perform dose calculations comparable to those of the AAA for RA plans in the homogeneous medium of the ArcCHECK phantom. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 10, 2019 Category: Physics Authors: Lalit Kumar Girigesh Yadav Vimal Kishore Manindra Bhushan Munish Gairola Deepak Tripathi Source Type: research
Impact of silver nanoparticles on the ultraviolet radiation direct and bystander effects on TK6 cell line
Conclusions: Our findings showed the induced DNA damage in TK6 cell by AgNPs and UVC radiation and also were seen BSE. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 10, 2019 Category: Physics Authors: Zohreh Eftekhari-Kenzerki Reza Fardid Abbas Behzad-Behbahani Source Type: research
Probing the effects of ionizing radiation on young & #39;s modulus of human erythrocytes cytoskeleton using atomic force microscopy
Conclusions: The elastic modulus of the erythrocytes could be an indicator of the adverse effect in the human blood generated by IR exposure through a radiotherapy treatment. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 10, 2019 Category: Physics Authors: Ellas Spyratou Maria Dilvoi George Patatoukas Kalliopi Platoni Mersini Makropoulou Efstathios Petros Efstathopoulos Source Type: research
Multi-energy computed tomography breast imaging with Monte Carlo simulations: Contrast-to-noise-based image weighting
Conclusions: The new proposed CNR-based image weighting scheme is easy to implement and can be used for complicated phantoms with varying structures. A large increase in the CNR is seen with or without the use of iodine contrast. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 10, 2019 Category: Physics Authors: D & #233;te Van Eeden Freek C. P Du Plessis Source Type: research
Performance validation of in-house developed four-dimensional dynamic phantom
Conclusions: The mechanical and imaging performances of FDDP were found within the acceptable limits. Therefore, this phantom can be used for quality assurance of 4D imaging process in radiotherapy. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 10, 2019 Category: Physics Authors: Rahul Kumar Chaudhary Rajesh Kumar SD Sharma Soumen Bera Vikram Mittal Sudesh Deshpande Source Type: research
Clinical evaluation of a two-dimensional liquid-filled ion chamber detector array for verification of high modulation small fields in radiotherapy
Conclusions: The Octavius 1000 SRS is a dosimetrically accurate device to perform quality assurance checks in SBRT treatments. The broad range of measurements performed in this study quantified the dosimetric accuracy of Octavius 1000 SRS detector in the clinical setup of the small fields in radiotherapy. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 10, 2019 Category: Physics Authors: Miljenko Markovic Ganesh Narayanasamy Sotirios Stathakis Panayiotis Mavroidis Ines-Ana Jurkovic Daniel Saenz Niko Papanikolaou Source Type: research
