Results 161 to 170 of about 7,739 (203)
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Displays, 2006
Electrophoretic image displays (EPIDs) are a very promising solution in the search for low-power, paper like reflective displays. While the technology is already mature, little is known about the internal physical properties. In this paper, we will describe which elements contribute to the charge transport and give an explanation of the steady state ...
Tom Bert +3 more
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Electrophoretic image displays (EPIDs) are a very promising solution in the search for low-power, paper like reflective displays. While the technology is already mature, little is known about the internal physical properties. In this paper, we will describe which elements contribute to the charge transport and give an explanation of the steady state ...
Tom Bert +3 more
openaire +3 more sources
Detection and correction for EPID and gantry sag during arc delivery using cine EPID imaging
Medical Physics, 2012Electronic portal imaging devices (EPIDs) have been studied and used for pretreatment and in-vivo dosimetry applications for many years. The application of EPIDs for dosimetry in arc treatments requires accurate characterization of the mechanical sag of the EPID and gantry during rotation. Several studies have investigated the effects of gravity on the
Peter Greer +2 more
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Medical Physics, 2001
There has been an increasing interest in the application of electronic portal imaging devices (EPIDs) to dosimetric verification, particularly for intensity modulated radiotherapy. Although not water equivalent, the phantom scatter factor of an EPID, is generally assumed to be that of a full phantom, a slab phantom, or a mini phantom.
J, Chang +3 more
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There has been an increasing interest in the application of electronic portal imaging devices (EPIDs) to dosimetric verification, particularly for intensity modulated radiotherapy. Although not water equivalent, the phantom scatter factor of an EPID, is generally assumed to be that of a full phantom, a slab phantom, or a mini phantom.
J, Chang +3 more
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WE‐G‐BRB‐02: MU‐EPID an EPID Based Tool for IMRT Quality Assurance
Medical Physics, 2012Purpose: 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
L Vazquez, Quino +5 more
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Generalized EPID calibration for in vivo transit dosimetry
Physica Medica, 2011Many researchers are studying new in vivo dosimetry methods based on the use of Elelctronic portal imaging devices (EPIDs) that are simple and efficient in their daily use. However the need of time consuming implementation measurements with solid water phantoms for the in vivo dosimetry implementation can discourage someone in their use.
Andrea, Fidanzio +6 more
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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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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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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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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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