Dosimetric dependence on the collimator angle in prostate volumetric modulated arc therapy

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SU-E-T-604: Dosimetric Dependence On the Collimator Angle in Prostate Volumetric Modulated Arc Therapy.

PURPOSE The purpose of this study is to investigate the dose-volume variations of planning target volume (PTV) and organs-at-risk (OARs) in prostate volumetric modulated arc therapy (VMAT) when using different collimator angles. It is because collimator angle awareness is essential for planner to produce an optimal prostate VMAT plan in a rational time. METHODS Single-arc VMAT plans at differ...

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Dosimetric Effect of Jaw Tracking in Volumetric-Modulated Arc Therapy

The aim of this study was to investigate the potential of jaw tracking with the volumetric-modulated arc therapy (VMAT) to reduce the normal tissue dose. Plans of nasopharynx, lung, and prostate cancers (10 plans for each) were used to perform VMAT with and without jaw tracking. The dose reduction was evaluated in terms of organ doses and integral doses. Organ-dose reduction with jaw tracking w...

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Dosimetric effects of sectional adjustments of collimator angles on volumetric modulated arc therapy for irregularly-shaped targets

PURPOSE To calculate an optimal collimator angle at each of sectional arcs in a full-arc volumetric modulated arc therapy (VMAT) plan and evaluate dosimetric quality of these VMAT plans comparing full-arc VMAT plans with a fixed collimator angle. METHODS Seventeen patients who had irregularly-shaped target in abdominal, head and neck, and chest cases were selected retrospectively. To calculat...

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Dosimetric impact of mixed - energy volumetric modulated arc therapy plans for high - risk prostate cancer

Purpose: This study investigated the dosimetric impact of mixing low and high energy treatment plans for high prostate cancer treated with volumetric modulated arc therapy (VMAT) technique in the form of RapidArc. Methods: A cohort of 12 prostate cases involving proximal seminal vesicles and lymph nodes was selected for this retrospective study. For each prostate case, the single-energy plans (...

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Quantification and modelling of the dosimetric impact of the treatment couch in volumetric modulated arc therapy (VMAT)

Background: As the volumetric modulated arc therapy (VMAT) becoming a main role of treatment ways, the effect of couch top becomes more significant. It is imperative to re-evaluate the couches that previously may have been considered of no importance during early treatment techniques. The impact of couch top on radiation delivery was explored and the couch model was tested with the aim of reduc...

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ژورنال

عنوان ژورنال: International Journal of Cancer Therapy and Oncology

سال: 2014

ISSN: 2330-4049

DOI: 10.14319/ijcto.0204.19