keyword
MENU ▼
Read by QxMD icon Read
search

imrt commissioning

keyword
https://www.readbyqxmd.com/read/27685107/initial-clinical-experience-with-arccheck-for-imrt-vmat-qa
#1
Michalis Aristophanous, Yelin Suh, Pai C Chi, Luke J Whittlesey, Scott LaNeave, Mary K Martel
Many devices designed for the purpose of performing patient-specific IMRT/VMAT QA are commercially available. In this work we report our experience and initial clinical results with the ArcCHECK. The ArcCHECK consists of a cylindrical array of diode detectors measuring entry and exit doses. The measured result is a cumulative dose displayed as a 2D matrix. The detector array requires both an absolute dose calibration, and a calibration of the detector response, relative to each other. In addition to the calibrations suggested by the manufacturer, various tests were performed in order to assess its stability and performance prior to clinical introduction...
September 8, 2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/27649474/the-ncs-code-of-practice-for-the-quality-assurance-and-control-for-volumetric-modulated-arc-therapy
#2
Anton Mans, Danny Schuring, Mark P Arends, Cornelia A J M Vugts, Jochem W H Wolthaus, Heidi T Lotz, Marjan Admiraal, Rob J W Louwe, Michel C Öllers, Jeroen B van de Kamer
In 2010, the NCS (Netherlands Commission on Radiation Dosimetry) installed a subcommittee to develop guidelines for quality assurance and control for volumetric modulated arc therapy (VMAT) treatments. The report (published in 2015) has been written by Dutch medical physicists and has therefore, inevitably, a Dutch focus. This paper is a condensed version of these guidelines, the full report in English is freely available from the NCS website www.radiationdosimetry.org. After describing the transition from IMRT to VMAT, the paper addresses machine quality assurance (QA) and treatment planning system (TPS) commissioning for VMAT...
October 7, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27461684/dosimetric-comparison-of-different-treatment-planning-techniques-with-international-commission-on-radiation-units-and-measurements-report-83-recommendations-in-adjuvant-pelvic-radiotherapy-of-gynecological-malignancies
#3
Evrim Duman, Aysun Inal, Aycan Sengul, Timur Koca, Yigit Cecen, Melek Nur Yavuz
AIM: The study evaluates the different treatment planning techniques according to three recommendation levels of the International Commission on Radiation Units and Measurements Report-83 in gynecologic cancer patients treated with adjuvant pelvic radiotherapy (APR). MATERIALS AND METHODS: Computerized tomography images of ten endometrial and cervical cancer patients who were treated with APR were assessed. For each patient, five different treatment plans were created...
April 2016: Journal of Cancer Research and Therapeutics
https://www.readbyqxmd.com/read/27440704/establishment-of-the-commissioning-procedure-for-modifying-the-beam-model-of-helical-tomotherapy
#4
Hidetoshi Shimizu, Koji Sasaki, Manabu Iwata, Tadashi Nakabayashi, Hiroshi Imamura, Kentaro Sugi, Takashi Kubota, Kazushi Yokoi, Kuniyasu Nakashima, Takeshi Kodaira
Although much evidence about the helical tomotherapy system are available, there is not a document about the procedure of quality assurance (QA) for changing the beam model. This study establishes the commissioning procedure for modifying the beam model of helical tomotherapy. Firstly, some intensity-modulated radiotherapy (IMRT) plans were created, and compared them with the calculated dose and the measured dose. Secondly, the absorbed doses to water in the machine-specific reference field and the plan-class specific reference field with a protocol in Japan; Standard Dosimetry of Absorbed Dose to Water in External Beam Radiotherapy (Standard Dosimetry 12) were measured...
July 2016: Nihon Hoshasen Gijutsu Gakkai Zasshi
https://www.readbyqxmd.com/read/27370123/a-gpu-accelerated-monte-carlo-dose-calculation-platform-and-its-application-toward-validating-an-mri-guided-radiation-therapy-beam-model
#5
Yuhe Wang, Thomas R Mazur, Olga Green, Yanle Hu, Hua Li, Vivian Rodriguez, H Omar Wooten, Deshan Yang, Tianyu Zhao, Sasa Mutic, H Harold Li
PURPOSE: The clinical commissioning of IMRT subject to a magnetic field is challenging. The purpose of this work is to develop a GPU-accelerated Monte Carlo dose calculation platform based on penelope and then use the platform to validate a vendor-provided MRIdian head model toward quality assurance of clinical IMRT treatment plans subject to a 0.35 T magnetic field. METHODS: penelope was first translated from fortran to c++ and the result was confirmed to produce equivalent results to the original code...
July 2016: Medical Physics
https://www.readbyqxmd.com/read/27051168/analyzing-the-characteristics-of-6-mv-photon-beam-at-low-monitor-unit-settings
#6
L Nithya, N Arunai Nambi Raj, Sasikumar Rathinamuthu
Analyzing the characteristics of a low monitor unit (MU) setting is essential, particularly for intensity-modulated techniques. Intensity modulation can be achieved through intensity-modulated radiotherapy (IMRT) or volumetric-modulated arc therapy (VMAT). There is possibility for low MUs in the segments of IMRT and VMAT plans. The minimum MU/segment must be set by the physicist in the treatment planning system at the time of commissioning. In this study, the characteristics such as dose linearity, stability, flatness, and symmetry of 6 MV photon beam of a Synergy linear accelerator at low MU settings were investigated for different dose rates...
January 2016: Journal of Medical Physics
https://www.readbyqxmd.com/read/27019460/optical-ct-3d-dosimetry-using-fresnel-lenses-with-minimal-refractive-index-matching-fluid
#7
Steven Bache, Javian Malcolm, John Adamovics, Mark Oldham
Telecentric optical computed tomography (optical-CT) is a state-of-the-art method for visualizing and quantifying 3-dimensional dose distributions in radiochromic dosimeters. In this work a prototype telecentric system (DFOS-Duke Fresnel Optical-CT Scanner) is evaluated which incorporates two substantial design changes: the use of Fresnel lenses (reducing lens costs from $10-30K t0 $1-3K) and the use of a 'solid tank' (which reduces noise, and the volume of refractively matched fluid from 1 ltr to 10 cc). The efficacy of DFOS was evaluated by direct comparison against commissioned scanners in our lab...
2016: PloS One
https://www.readbyqxmd.com/read/26894352/pinnacle3-modeling-and-end-to-end-dosimetric-testing-of-a-versa-hd-linear-accelerator-with-the-agility-head-and-flattening-filter-free-modes
#8
Daniel L Saenz, Ganesh Narayanasamy, Wilbert Cruz, Nikos Papanikolaou, Sotirios Stathakis
The Elekta Versa HD incorporates a variety of upgrades to the line of Elekta linear accelerators, primarily including the Agility head and flattening filter-free (FFF) photon beam delivery. The completely distinct dosimetric output of the head from its predecessors, combined with the FFF beams, requires a new investigation of modeling in treatment planning systems. A model was created in Pinnacle3 v9.8 with the commissioned beam data. A phantom consisting of several plastic water and Styrofoam slabs was scanned and imported into Pinnacle3, where beams of different field sizes, source-to-surface distances (SSDs), wedges, and gantry angles were devised...
2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/26894330/on-the-sensitivity-of-tg-119-and-iroc-credentialing-to-tps-commissioning-errors
#9
Drew McVicker, Fang-Fang Yin, Justus D Adamson
We investigate the sensitivity of IMRT commissioning using the TG-119 C-shape phantom and credentialing with the IROC head and neck phantom to treatment planning system commissioning errors. We introduced errors into the various aspects of the commissioning process for a 6X photon energy modeled using the analytical anisotropic algorithm within a commercial treatment planning system. Errors were implemented into the various components of the dose calculation algorithm including primary photons, secondary photons, electron contamination, and MLC parameters...
2016: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/26699564/quantitative-analysis-of-brass-compensators-for-commissioning-of-the-pinnacle-planning-system-for-imrt
#10
Larry L Gates, David J Gladstone
Brass compensators for beam modulation present an alternative method for IMRT treatment planning to traditional dynamic leaf modulation. In this work, we present a detailed method to commission the Pinnacle treatment planning system for IMRT using brass compensators. Beam attenuation from various brass thicknesses were measured using an ion chamber, as well as a MapCHECK device, for a representative seven-field IMRT plan. We show that Pinnacle's parameters for compensators can be optimized to match the measured results while still maintaining the original open-beam model...
2015: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/26699557/practical-dose-delivery-verification-of-craniospinal-imrt
#11
COMPARATIVE STUDY
Young K Lee, Anthony T Kim, Peiying Zhao, Aliaksandr Karotki
Craniospinal irradiation (CSI) using IMRT allows dose sparing to organs-at-risk (OAR) whilst conforming the dose to the target volume. Due to the complexity of treatment involving several isocenters, the dose distribution created by the inverse-planned segmented fields must be verified prior to treatment. We propose and test methods to verify dose delivery using commonly available dosimetry equipment for commissioning and routine patient-specific dose verification of craniospinal IMRT. Ten patients treated with conventional CSI were retrospectively planned with a 3-isocenter (cranial, upper spine, and lower spine) IMRT technique...
2015: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/26311077/the-effect-of-slice-thickness-on-target-and-organs-at-risk-volumes-dosimetric-coverage-and-radiobiological-impact-in-imrt-planning
#12
S P Srivastava, C-W Cheng, I J Das
PURPOSE: Dose-volume histogram (DVH) has become an important tool for evaluation of radiation outcome as reflected from many clinical protocols. While dosimetric accuracy in treatment planning system (TPS) is well quantified, the variability in volume estimation is uncertain due to reconstruction algorithm that is investigated in this study. In addition, the impact of dose distribution and tumor control probability (TCP) were also investigated with CT slice thickness for IMRT planning...
May 2016: Clinical & Translational Oncology
https://www.readbyqxmd.com/read/26229657/intensity-modulated-radiation-therapy-to-bilateral-lower-limb-extremities-concurrently-a-planning-case-study
#13
Emma Fitzgerald, Wesley Miles, Paul Fenton, Jim Frantzis
Non-melanomatous skin cancers represent 80% of all newly diagnosed cancers in Australia with basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) being the most common. A previously healthy 71-year-old woman presented with widespread and tender superficial skin cancers on the lower bilateral limbs. External beam radiation therapy through the use of intensity-modulated radiation therapy (IMRT) was employed as the treatment modality of choice as this technique provides conformal dose distribution to a three-dimensional treatment volume while reducing toxicity to surrounding tissues...
September 2014: Journal of Medical Radiation Sciences
https://www.readbyqxmd.com/read/26226323/a-novel-convolution-based-approach-to-address-ionization-chamber-volume-averaging-effect-in-model-based-treatment-planning-systems
#14
Brendan Barraclough, Jonathan G Li, Sharon Lebron, Qiyong Fan, Chihray Liu, Guanghua Yan
The ionization chamber volume averaging effect is a well-known issue without an elegant solution. The purpose of this study is to propose a novel convolution-based approach to address the volume averaging effect in model-based treatment planning systems (TPSs). Ionization chamber-measured beam profiles can be regarded as the convolution between the detector response function and the implicit real profiles. Existing approaches address the issue by trying to remove the volume averaging effect from the measurement...
August 21, 2015: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/26219014/dosimetric-comparison-of-acuros-xb-with-collapsed-cone-convolution-superposition-and-anisotropic-analytic-algorithm-for-stereotactic-ablative-radiotherapy-of-thoracic-spinal-metastases
#15
Heming Zhen, Brian Hrycushko, Huichen Lee, Robert Timmerman, Arnold Pompoš, Strahinja Stojadinovic, Ryan Foster, Steve B Jiang, Timothy Solberg, Xuejun Gu
The aim of this study is to compare the recent Eclipse Acuros XB (AXB) dose calculation engine with the Pinnacle collapsed cone convolution/superposition (CCC) dose calculation algorithm and the Eclipse anisotropic analytic algorithm (AAA) for stereotactic ablative radiotherapy (SAbR) treatment planning of thoracic spinal (T-spine) metastases using IMRT and VMAT delivery techniques. The three commissioned dose engines (CCC, AAA, and AXB) were validated with ion chamber and EBT2 film measurements utilizing a heterogeneous slab-geometry water phantom and an anthropomorphic phantom...
2015: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/26129585/th-ef-brd-02-an-analytic-linear-accelerator-source-model-and-automatic-source-commissioning-for-gpu-based-fast-monte-carlo-dose-calculation
#16
Z Tian, M Folkerts, Y Li, F Shi, S Jiang, X Jia
PURPOSE: GPU-based Monte Carlo (MC) dose calculations have become available. Linac source modeling for it is still a problem to be addressed. The model should be carefully designed for sufficient accuracy, ease of automatic commissioning, and more importantly suitability for parallelization. This abstract presents an analytical source model for GPU-based MC dose engines with these factors considered. METHODS: Analytical source models are preferred for GPU comparing to phase-space-file based models due to the avoidance of loading and transferring large data...
June 2015: Medical Physics
https://www.readbyqxmd.com/read/26129196/we-ab-201-02-tps-commissioning-and-qa-a-process-orientation-and-application-of-control-charts
#17
M Sharpe
UNLABELLED: Treatment planning systems (TPS) are a cornerstone of modern radiation therapy. Errors in their commissioning or use can have a devastating impact on many patients. To support safe and high quality care, medical physicists must conduct efficient and proper commissioning, good clinical integration, and ongoing quality assurance (QA) of the TPS. AAPM Task Group 53 and related publications have served as seminal benchmarks for TPS commissioning and QA over the past two decades...
June 2015: Medical Physics
https://www.readbyqxmd.com/read/26129195/we-ab-201-01-treatment-planning-system-commissioning-and-qa-challenges-and-opportunities
#18
G Salomons
UNLABELLED: Treatment planning systems (TPS) are a cornerstone of modern radiation therapy. Errors in their commissioning or use can have a devastating impact on many patients. To support safe and high quality care, medical physicists must conduct efficient and proper commissioning, good clinical integration, and ongoing quality assurance (QA) of the TPS. AAPM Task Group 53 and related publications have served as seminal benchmarks for TPS commissioning and QA over the past two decades...
June 2015: Medical Physics
https://www.readbyqxmd.com/read/26129194/we-ab-201-03-tps-commissioning-and-qa-incorporating-the-entire-planning-process
#19
S Mutic
UNLABELLED: Treatment planning systems (TPS) are a cornerstone of modern radiation therapy. Errors in their commissioning or use can have a devastating impact on many patients. To support safe and high quality care, medical physicists must conduct efficient and proper commissioning, good clinical integration, and ongoing quality assurance (QA) of the TPS. AAPM Task Group 53 and related publications have served as seminal benchmarks for TPS commissioning and QA over the past two decades...
June 2015: Medical Physics
https://www.readbyqxmd.com/read/26129190/we-ab-201-04-the-recommendations-of-mppg-5-and-practical-implementation-strategies
#20
J Smilowitz
UNLABELLED: Treatment planning systems (TPS) are a cornerstone of modern radiation therapy. Errors in their commissioning or use can have a devastating impact on many patients. To support safe and high quality care, medical physicists must conduct efficient and proper commissioning, good clinical integration, and ongoing quality assurance (QA) of the TPS. AAPM Task Group 53 and related publications have served as seminal benchmarks for TPS commissioning and QA over the past two decades...
June 2015: Medical Physics
keyword
keyword
57701
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"