Results 171 to 180 of about 12,436 (210)
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Modulation indices for volumetric modulated arc therapy
Physics in Medicine and Biology, 2014The aim of this study is to present a modulation index (MI) for volumetric modulated arc therapy (VMAT) based on the speed and acceleration analysis of modulating-parameters such as multi-leaf collimator (MLC) movements, gantry rotation and dose-rate, comprehensively.
Jong Min, Park +5 more
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Commissioning of Volumetric Modulated Arc Therapy (VMAT)
International Journal of Radiation Oncology*Biology*Physics, 2009Volumetric modulated arc therapy (VMAT) involves the simultaneous use of dynamic multileaf collimator (DMLC) techniques and gantry arcing; appropriate quality assurance is therefore required. This article describes the development and implementation of procedures for commissioning VMAT on a commercial linear accelerator (Elekta PreciseBeam VMAT with ...
James L, Bedford, Alan P, Warrington
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Clinical Neurology and Neurosurgery, 2019
Advanced techniques such as volumetric-modulated arc therapy (VMAT) may reduce radiation damage and improve the quality of life for patients.We performed a study comparing dose distributions to the planning target volumes(PTVs) and other organs at risk (OARs) of intensity-modulated radiotherapy (IMRT),coplanar VMAT (coVMAT), and non-coplanar VMAT ...
Yong Hou +6 more
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Advanced techniques such as volumetric-modulated arc therapy (VMAT) may reduce radiation damage and improve the quality of life for patients.We performed a study comparing dose distributions to the planning target volumes(PTVs) and other organs at risk (OARs) of intensity-modulated radiotherapy (IMRT),coplanar VMAT (coVMAT), and non-coplanar VMAT ...
Yong Hou +6 more
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Couch modelling for volumetric modulated arc therapy (VMAT)
Australasian Physical & Engineering Sciences in Medicine, 2017The aim of this work was to investigate the impact of the accuracy of a certain couch model on the overall accuracy of the dose calculation. For this purpose two models of the Varian Exact Couch (Varian Medical Systems, Palo Alto, CA, USA) for use in the planning of volumetric modulated arc therapy (VMAT) were created in Monaco 5.1 (Elekta, Stockholm ...
Te-yu Chyou, Friedlieb Lorenz
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MO-A-211-01: Volumetric Modulated Arc Therapy
Medical Physics, 2012Volumetric Modulated Arc Therapy (VMAT) is a rotational approach to the delivery of intensity modulated radiation therapy (IMRT) that can be delivered on a conventional linear accelerator. VMAT combines the dosimetric advantages of rotational delivery with the dose painting capabilities of IMRT.
D, Shepard, R, Popple
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Treatment planning for volumetric modulated arc therapy
Medical Physics, 2009Purpose: Volumetric modulated arc therapy (VMAT) is a specific type of intensity‐modulated radiation therapy (IMRT) in which the gantry speed, multileaf collimator (MLC) leaf position, and dose rate vary continuously during delivery. A treatment planning system for VMAT is presented.Methods: Arc control points are created uniformly throughout one or ...
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Intensity-Modulated Radiation Therapy and Volumetric-Modulated Arc Therapy
2019Due to its dosimetric superiority relative to traditional techniques, intensity-modulated radiation therapy (IMRT) has become increasingly common in the management of gynecologic malignancies. The increased conformality of the dose distribution delivered via IMRT permits the delivery of an effective dose to irregularly shaped targets while ...
O. Lee Burnett +3 more
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Volumetric modulated arc therapy: IMRT in a single gantry arc
Medical Physics, 2007In this work a novel plan optimization platform is presented where treatment is delivered efficiently and accurately in a single dynamically modulated arc. Improvements in patient care achieved through image‐guided positioning and plan adaptation have resulted in an increase in overall treatment times.
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Simultaneous trajectory generation and volumetric modulated arc therapy optimization
Medical Physics, 2020PurposeTrajectory‐based treatment planning involves the combination of a gantry‐couch trajectory with volumetric modulated arc therapy (VMAT) treatment plan optimization. This work presents the implementation of an optimization methodology that generates a trajectory simultaneous with treatment plan optimization (simTr‐VMAT).MethodsThe optimization ...
Joel, Mullins +3 more
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An algorithm to calculate a collapsed arc dose matrix in volumetric modulated arc therapy
Medical Physics, 2013Purpose:The delivery of volumetric modulated arc therapy (VMAT) is more complex than other conformal radiotherapy techniques. In this work, the authors present the feasibility of performing routine verification of VMAT delivery using a dose matrix measured by a gantry mounted 2D ion chamber array and corresponding dose matrix calculated by an inhouse ...
Arumugam, Sankar +3 more
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