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Journal of Applied Clinical Medical Physics

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https://www.readbyqxmd.com/read/29239528/quantifying-the-effect-of-air-gap-depth-and-range-shifter-thickness-on-tps-dosimetric-accuracy-in-superficial-pbs-proton-therapy
#1
Robert J Shirey, Hsinshun Terry Wu
This study quantifies the dosimetric accuracy of a commercial treatment planning system as functions of treatment depth, air gap, and range shifter thickness for superficial pencil beam scanning proton therapy treatments. The RayStation 6 pencil beam and Monte Carlo dose engines were each used to calculate the dose distributions for a single treatment plan with varying range shifter air gaps. Central axis dose values extracted from each of the calculated plans were compared to dose values measured with a calibrated PTW Markus chamber at various depths in RW3 solid water...
December 14, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29226607/comparison-of-the-convolution-algorithm-with-tmr10-for-leksell-gamma-knife-and-dosimetric-verification-with-radiochromic-gel-dosimeter
#2
Petra Osmancikova, Josef Novotny, Jaroslav Solc, Jan Pipek
The Convolution algorithm, implemented in Leksell GammaPlan® ver. Here, 10, is the first algorithm for Leksell Gamma Knife that takes heterogeneities into account and models dose build-up effects close to tissue boundaries. The aim of this study was preliminary comparison of the Convolution and TMR10 algorithms for real clinical cases and dosimetric verification of the algorithms, using measurements in a phantom. A total of 25 patients involved in comparison of the Convolution and TMR10 algorithms were divided into three groups: patients with benign tumors close to heterogeneities, patients with functional disorders, and patients with tumors located far from heterogeneities...
December 10, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29218841/improvement-of-conformal-arc-plans-by-using-deformable-margin-delineation-method-for-stereotactic-lung-radiotherapy
#3
Görkem Güngör, Melek Demir, Gökhan Aydın, Bülent Yapıcı, Banu Atalar, Enis Özyar
PURPOSE: Stereotactic body radiotherapy (SBRT) is an established treatment technique in the management of medically inoperable early stage non-small cell lung cancer (NSCLC). Different techniques such as volumetric modulated arc (VMAT) and three-dimensional conformal arc (DCA) can be used in SBRT. Previously, it has been shown that VMAT is superior to DCA technique in terms of plan evaluation parameters. However, DCA technique has several advantages such as ease of use and considerable shortening of the treatment time...
December 7, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29205837/comp-report-cpqr-technical-quality-control-guideline-for-medical-linear-accelerators-and-multileaf-collimators
#4
Charles Kirkby, Esmaeel Ghasroddashti, Crystal Plume Angers, Grace Zeng, Erin Barnett
The Canadian Organization of Medical Physicists (COMP), in close partnership with the Canadian Partnership for Quality Radiotherapy (CPQR) has developed a series of Technical Quality Control (TQC) guidelines for radiation treatment equipment. These guidelines outline the performance objectives that equipment should meet in order to ensure an acceptable level of radiation treatment quality. The TQC guidelines have been rigorously reviewed and field tested in a variety of Canadian radiation treatment facilities...
December 4, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29205763/a-comparison-of-two-pencil-beam-scanning-treatment-planning-systems-for-proton-therapy
#5
Ulrich W Langner, Michelle Mundis, Dan Strauss, Mingyao Zhu, Sina Mossahebi
OBJECTIVE: Analytical dose calculation algorithms for Eclipse and Raystation treatment planning systems (TPS), as well as a Raystation Monte Carlo model are compared to corresponding measured point doses. METHOD: The TPS were modeled with the same beam data acquired during commissioning. Thirty-five typical plans were made with each planning system, 31 without range shifter and four with a 5 cm range shifter. Point doses in these planes were compared to measured doses...
December 4, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29194940/the-development-of-a-4d-treatment-planning-methodology-to-simulate-the-tracking-of-central-lung-tumors-in-an-mri-linac
#6
Shahad M Al-Ward, Anthony Kim, Claire McCann, Mark Ruschin, Patrick Cheung, Arjun Sahgal, Brian M Keller
PURPOSE: Targeting and tracking of central lung tumors may be feasible on the Elekta MRI-linac (MRL) due to the soft-tissue visualization capabilities of MRI. The purpose of this work is to develop a novel treatment planning methodology to simulate tracking of central lung tumors with the MRL and to quantify the benefits in OAR sparing compared with the ITV approach. METHODS: Full 4D-CT datasets for five central lung cancer patients were selected to simulate the condition of having 4D-pseudo-CTs derived from 4D-MRI data available on the MRL with real-time tracking capabilities...
December 1, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29193644/the-use-of-needle-holders-in-ctf-guided-biopsies-as-a-dose-reduction-tool
#7
Sandra Sarmento, Joana S Pereira, Maria José Sousa, Luís T Cunha, Anabela G Dias, Miguel F Pereira, Augusto D Oliveira, João V Cardoso, Luís M Santos, João A M Santos, João G Alves
PURPOSE: The purpose of this study was to evaluate the efficacy of needle holders in reducing staff hand exposure during biopsies guided by computed tomography fluoroscopy (CTF), through the analysis of data acquired during a detailed monitoring study, undertaken in parallel with an ongoing optimization process to reduce hand irradiation. METHODS: Hand monitoring was performed with 11 extremity detectors, two per finger (base and tip) and one on the back of the wrist, for the left (dominant) hand, during two series of biopsies with comparable characteristics...
November 29, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29178595/a-simplified-monte-carlo-algorithm-considering-large-angle-scattering-for-fast-and-accurate-calculation-of-proton-dose
#8
Taisuke Takayanagi, Shusuke Hirayama, Shinichiro Fujitaka, Rintaro Fujimoto
PURPOSE: The purpose of this study is to improve dose calculation accuracy of the simplified Monte Carlo (SMC) algorithm in the low-dose region. Because conventional SMC algorithms calculate particle scattering in consideration of multiple Coulomb scattering (MCS) only, they approximate lateral dose profiles by a single Gaussian function. However, it is well known that the low-dose region spreads away from the beam axis, and it has been pointed out that modeling of the low-dose region is important to calculated dose accurately...
November 27, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29178585/volumetric-modulated-arc-therapy-versus-intensity-modulated-radiotherapy-for-large-volume-retroperitoneal-sarcomas-a-comparative-analysis-of-dosimetric-and-treatment-delivery-parameters
#9
Amandeep S Taggar, Darren Graham, Elizabeth Kurien, James L Gräfe
PURPOSE: To compare dosimetric and treatment delivery parameter differences between volumetric-modulated arc radiotherapy (VMAT) and intensity-modulated radiotherapy (IMRT) for large volume retroperitoneal sarcomas (RPS). MATERIALS AND METHODS: Both VMAT and IMRT planning were performed on CT datasets of 10 patients with RPS who had been previously treated with preoperative radiotherapy. Plans were optimized to deliver ≥95% dose to the PTV and were evaluated for conformity and homogeneity...
November 27, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29178549/evaluation-of-aapm-reports-204-and-220-estimation-of-effective-diameter-water-equivalent-diameter-and-ellipticity-ratios-for-chest-abdomen-pelvis-and-head-ct-scans
#10
Christiane S Burton, Timothy P Szczykutowicz
PURPOSE: To confirm AAPM Reports 204/220 and provide data for the future expansion of these reports by: (a) presenting the first large-scale confirmation of the reports using clinical data, (b) providing the community with size surrogate data for the head region which was not provided in the original reports, and additionally providing the measurements of patient ellipticity ratio for different body regions. METHOD: A total of 884 routine scans were included in our analysis including data from the head, thorax, abdomen, and pelvis for adults and pediatrics...
November 27, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29178546/evaluation-of-dosimetric-advantages-of-using-patient-specific-aperture-system-with-intensity-modulated-proton-therapy-for-the-shallow-depth-tumor
#11
Keisuke Yasui, Toshiyuki Toshito, Chihiro Omachi, Kensuke Hayashi, Kenichiro Tanaka, Kumiko Asai, Akira Shimomura, Rie Muramatsu, Naoki Hayashi
In this study, we evaluate dosimetric advantages of using patient-specific aperture system with intensity-modulated proton therapy (IMPT) for head and neck tumors at the shallow depth. We used four types of patient-specific aperture system (PSAS) to irradiate shallow regions less than 4 g/cm2 with a sharp lateral penumbra. Ten head and neck IMPT plans with or without aperture were optimized separately with the same 95% prescription dose and same dose constraint for organs at risk (OARs). The plans were compared using dose volume histograms (DVHs), dose distributions, and some dose indexes such as volume receiving 50% of the prescribed dose (V50 ), mean or maximum dose (Dmean and Dmax ) to the OARs...
November 27, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29165915/development-and-implementation-of-a-radiation-therapy-incident-learning-system-compatible-with-local-workflow-and-a-national-taxonomy
#12
Logan Montgomery, Palma Fava, Carolyn R Freeman, Tarek Hijal, Ciro Maietta, William Parker, John Kildea
PURPOSE: Collaborative incident learning initiatives in radiation therapy promise to improve and standardize the quality of care provided by participating institutions. However, the software interfaces provided with such initiatives must accommodate all participants and thus are not optimized for the workflows of individual radiation therapy centers. This article describes the development and implementation of a radiation therapy incident learning system that is optimized for a clinical workflow and uses the taxonomy of the Canadian National System for Incident Reporting - Radiation Treatment (NSIR-RT)...
November 22, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29165913/comp-report-cqpr-technical-quality-control-guidelines-for-kilovoltage-x-ray-radiotherapy-machines
#13
Christophe Furstoss
The Canadian Organization of Medical Physicists (COMP) in close partnership with the Canadian Partnership for Quality Radiotherapy (CPQR) has developed a series of Technical Quality Control (TQC) guidelines for radiation treatment equipment. These guidelines outline the performance objectives that equipment should meet in order to ensure an acceptable level of radiation treatment quality. The TQC guidelines have been rigorously reviewed and field tested at various Canadian radiation treatment facilities. The development process enables rapid review and update to keep the guidelines current with changes in technology (the most updated version of this guideline can be found on the CPQR website)...
November 22, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29165912/reproducibility-of-radioactive-iodine-uptake-raiu-measurements
#14
Matthieu Pelletier-Galarneau, Patrick Martineau, Ran Klein, Matthew Henderson, Lionel S Zuckier
BACKGROUND: Measurement of radioactive iodine uptake (RAIU) is an important aspect of the assessment and treatment of patients with hyperthyroidism. Its uncertainty affects how much of a true change in RAIU can be detected as well as appropriateness of the therapy dosage upon which it is based. In this study, a method of estimating the reproducibility and least significant change (LSC) values for RAIU measurements, and the implications of the values observed are discussed, with emphasis on application to quality assurance initiatives...
November 22, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29159920/quality-assurance-for-a-six-degrees-of-freedom-table-using-a-3d-printed-phantom
#15
Kyle Woods, Ahmet S Ayan, Jeffrey Woollard, Nilendu Gupta
PURPOSE: To establish a streamlined end-to-end test of a 6 degrees-of-freedom (6DoF) robotic table using a 3D printed phantom for periodic quality assurance. METHODS: A 3D printed phantom was fabricated with translational and rotational offsets and an imbedded central ball-bearing (BB). The phantom underwent each step of the radiation therapy process: CT simulation in a straight orientation, plan generation using the treatment planning software, setup to offset marks at the linac, registration and corrected 6DoF table adjustments via hidden target test, delivery of a Winston-Lutz test to the BB, and verification of table positioning via field and laser lights...
November 21, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29152898/tolerance-levels-of-ct-number-to-electron-density-table-for-photon-beam-in-radiotherapy-treatment-planning-system
#16
Minoru Nakao, Shuichi Ozawa, Kiyoshi Yamada, Katsunori Yogo, Fumika Hosono, Masahiro Hayata, Akito Saito, Kentaro Miki, Takeo Nakashima, Yusuke Ochi, Daisuke Kawahara, Yoshiharu Morimoto, Toru Yoshizaki, Hiroshige Nozaki, Kosaku Habara, Yasushi Nagata
The accuracy of computed tomography number to electron density (CT-ED) calibration is a key component for dose calculations in an inhomogeneous medium. In a previous work, it was shown that the tolerance levels of CT-ED calibration became stricter with an increase in tissue thickness and decrease in the effective energy of a photon beam. For the last decade, a low effective energy photon beam (e.g., flattening-filter-free (FFF)) has been used in clinical sites. However, its tolerance level has not been established yet...
November 20, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29152846/on-the-geud-biological-optimization-objective-for-organs-at-risk-in-photon-optimizer-of-eclipse-treatment-planning-system
#17
Antonella Fogliata, Stephen Thompson, Antonella Stravato, Stefano Tomatis, Marta Scorsetti, Luca Cozzi
Inverse planning optimization using biologically based objectives is becoming part of the intensity modulated optimization process. The performances and efficacy of the biologically based gEUD (generalized Equivalent Uniform Dose) objective implemented in the Photon Optimizer (PO) of Varian Eclipse treatment planning system have been here analyzed. gEUD is associated with the parameter a that accounts for the seriality of a structure, being higher for more serial organs. The PO was used to optimize volumetric modulated arc therapy (VMAT) plans on a virtual homogeneous cylindrical phantom presenting a target and an organ at risk (OAR)...
November 20, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29152840/on-the-use-of-bolus-for-pacemaker-dose-measurement-and-reduction-in-radiation-therapy
#18
Huagang Yan, Fanqing Guo, Dengsong Zhu, Stefan Stryker, Sharron Trumpore, Kenneth Roberts, Susan Higgins, Ravinder Nath, Zhe Chen, Wu Liu
Special attention is required in planning and administering radiation therapy to patients with cardiac implantable electronic devices (CIEDs), such as pacemaker and defibrillator. The range of dose to CIEDs that can induce malfunction is large among CIEDs. Clinically significant defects have been reported at dose as low as 0.15 Gy. Therefore, accurate estimation of dose to CIED and dose reduction are both important even if the dose is expected to be less than the often-used 2-Gy limit. We investigated the use of bolus in in vivo dosimetry for CIEDs...
November 20, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29152838/commissioning-of-the-world-s-first-compact-pencil-beam-scanning-proton-therapy-system
#19
Rajesh Pidikiti, Bijal C Patel, Matthew R Maynard, Joseph P Dugas, Joseph Syh, Narayan Sahoo, Hsinshun Terry Wu, Lane R Rosen
This paper summarizes clinical commissioning of the world's first commercial, clinically utilized installation of a compact, image-guided, pencil-beam scanning, intensity-modulated proton therapy system, the IBA Proteus(®) ONE, at the Willis-Knighton Cancer Center (WKCC) in Shreveport, LA. The Proteus(®) ONE is a single-room, compact-gantry system employing a cyclotron-generated proton beam with image guidance via cone-beam CT as well as stereoscopic orthogonal and oblique planar kV imaging. Coupling 220° of gantry rotation with a 6D robotic couch capable of in plane patient rotations of over 180° degrees allows for 360° of treatment access...
November 20, 2017: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29152835/intra-and-inter-fractional-liver-and-lung-tumor-motions-treated-with-sbrt-under-active-breathing-control
#20
Lan Lu, Claudiu Diaconu, Toufik Djemil, Gregory Mm Videtic, May Abdel-Wahab, Naichang Yu, John Greskovich, Kevin L Stephans, Ping Xia
PURPOSE: To assess intra- and inter-fractional motions of liver and lung tumors using active breathing control (ABC). METHODS AND MATERIALS: Nineteen patients with liver cancer and 15 patients with lung cancer treated with stereotactic body radiotherapy (SBRT) were included in this retrospective study. All patients received a series of three CTs at simulation to test breath-hold reproducibility. The centroids of the whole livers and of the lung tumors from the three CTs were compared to assess intra-fraction variability...
November 20, 2017: Journal of Applied Clinical Medical Physics
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