Results 111 to 120 of about 4,431 (152)
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Radiotherapy and Oncology, 2009
The complexity of radiotherapy today demands thorough verification of the dose delivered to the patient. Dosimetry using electronic portal imaging devices (EPIDs) has received considerable attention recently, since with this method dose verification can be performed accurately and efficiently, both pre-treatment and in vivo.
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The complexity of radiotherapy today demands thorough verification of the dose delivered to the patient. Dosimetry using electronic portal imaging devices (EPIDs) has received considerable attention recently, since with this method dose verification can be performed accurately and efficiently, both pre-treatment and in vivo.
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2018
Introduction: The most modern radiotherapy devices are equipped with an Electronic Portal Imaging Device (EPID) system which is located on opposite side of the machine’s head. EPID system is often used to setting up the position verification during or between radiotherapy sessions.
Mohammadi, Mahdi, Haghparast, Abbas
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Introduction: The most modern radiotherapy devices are equipped with an Electronic Portal Imaging Device (EPID) system which is located on opposite side of the machine’s head. EPID system is often used to setting up the position verification during or between radiotherapy sessions.
Mohammadi, Mahdi, Haghparast, Abbas
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Characterization of EPID software for VMAT transit dosimetry
Australasian Physical & Engineering Sciences in Medicine, 2018Dosimetry check (DC) is a commercial software that allows reconstruction of 3D dose distributions using transit electronic portal imaging device (EPID) images. In this work, we evaluated the suitability of DC software for volumetric modulated arc therapy (VMAT) transit dosimetry.
Marco Esposito +6 more
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In vivo dosimetry by an aSi‐based EPID
Medical Physics, 2006A method for the in vivo determination of the isocenter dose, , and mid‐plane dose, , using the transmitted signal measured by 25 central pixels of an aSi‐based EPID is here reported. The method has been applied to check the conformal radiotherapy of pelvic tumors and supplies accurate in vivo dosimetry avoiding many of the disadvantages associated ...
Angelo, Piermattei +10 more
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Quality assurance measurements of a-si epid performance
Medical Dosimetry, 2004The performance stability of a Varian aS500 amorphous silicon (a-Si) electronic portal imaging device (EPID) was monitored over an 18-month period using a variety of standard quality assurance (QA) tests. The tests were selected to provide ongoing information about image quality and dose response from the time of EPID acceptance into clinical service ...
Geetha V, Menon, Ron S, Sloboda
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Compensator quality control with an amorphous silicon EPID
Medical Physics, 2003The calibration and quality control of compensators is conventionally performed with an ion chamber in a water‐equivalent phantom. In our center, the compensator factor and four off‐axis fluence ratios are measured to verify the central axis beam modulation and orientation of the compensator. Here we report the investigation of an alternative technique
Geetha V, Menon, Ron S, Sloboda
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Dosimetric IMRT verification with a flat‐panel EPID
Medical Physics, 2003A convolution‐based calibration procedure has been developed to use an amorphous silicon flat‐panel electronic portal imaging device (EPID) for accurate dosimetric verification of intensity‐modulated radiotherapy (IMRT) treatments. Raw EPID images were deconvolved to accurate, high‐resolution 2‐D distributions of primary fluence using a scatter kernel ...
B, Warkentin +3 more
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Dose‐response characteristics of an amorphous silicon EPID
Medical Physics, 2005Electronic portal imaging devices (EPIDs) were originally developed for the purpose of patient setup verification. Nowadays, they are increasingly used as dosimeters (e.g., for IMRT verification and linac‐specific QA). A prerequisite for any clinical dosimetric application is a detailed understanding of the detector's dose‐response behavior. The aim of
Peter, Winkler +2 more
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Transit dosimetry in dynamic IMRT with an a-Si EPID
Medical & Biological Engineering & Computing, 2014Using an amorphous silicon (a-Si) EPID for transit dosimetry requires detailed characterization of its dosimetric response in a variety of conditions. In this study, a measurement-based model was developed to calibrate an a-Si EPID response to dose for transit dosimetry by comparison with a reference ionization chamber. The ionization chamber reference
Mahsheed Sabet +3 more
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Simplifying EPID dosimetry for IMRT treatment verification
Medical Physics, 2011Purpose:Electronic portal imaging devices (EPIDs) are increasingly used for IMRT dose verification, both pretreatment andin vivo. In this study, an earlier developed backprojection model has been modified to avoid the need for patient‐specific transmission measurements and, consequently, leads to a faster procedure.Methods:Currently, the transmission ...
Van Herk, Marcel; id_orcid 0000-0001-6448-898X +7 more
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