نتایج جستجو برای: transit dosimetry epid
تعداد نتایج: 29182 فیلتر نتایج به سال:
Abstract In this study, the feasibility of using electronic portal imaging device (EPID) as an analysing equipment for bolus material was evaluated in terms its dosimetric parameters. Seven superflab samples, 4 samples 0.5 cm (S1–S4) and 3 1 thickness (S5–S7), were analysed compared with tissue equivalent water phantom, which selected reference material. Gamma analysis method used to evaluate d...
Beams-eye-view imaging applications such as real-time soft-tissue motion estimation are hindered by the inherently low image contrast of electronic portal imaging devices (EPID) currently available for clinical use. We introduce and characterize a novel EPID design that provides substantially increased detective quantum efficiency (DQE), contrast-to-noise ratio (CNR) and sensitivity without deg...
AIM To compare the accuracy of radiotherapy set-up using an electronic portal imaging device (EPID) versus megavoltage cone beam computed tomography (MV-CBCT) in paediatric patients. MATERIALS AND METHODS In total, 204 pairs of EPID and MV-CBCT were carried out for 72 patients in the first 3 treatment days and weekly thereafter. RESULTS For the whole group, the mean systematic EPID set-up e...
PURPOSE A software program (MU-EPID) has been developed to perform patient specific IMRT pre-treatment QA verification using an electronic portal imaging device. METHODS The software converts measured images of intensity modulated beams delivered to an EPID, into fluence maps that can be imported in the treatment planning system. The dose can then be calculated in the patient anatomy and comp...
Radiotherapy is one of the main treatment modalities to treat cancer. Image based treatment verification has been recently introduced. However, a quantitative comparison between the planned and delivered dose is a novel development in the field of radiotherapy. In this thesis, the added value of quantitative in-treatment dose measurements techniques to facilitate adaptive radiotherapy has been ...
ID: 5462 Title: Advances in Co-60 based Tomotherapy Including Megavoltage CT Purpose: To evaluate the potential for Co-60 based tomotherapy including dose delivery and mega-voltage CT (MVCT). Tomotherapy is a rotational implementation of IMRT that provides highly conformal doses and patient setup verification using MVCT. Current tomotherapy is limited to linear accelerators. This poster present...
PURPOSE To investigate the long term stability and viability of using EPID-based daily output QA via in-house and vendor driven protocol, to replace conventional QA tools and improve QA efficiency. METHODS Two Varian TrueBeam machines (TB1&TB2) equipped with electronic portal imaging devices (EPID) were employed in this study. Both machines were calibrated per TG-51 and used clinically since ...
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