Electronic portal imaging device

Results 211 to 220 of about 40,542 (246)

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Verification of compensator thicknesses using a fluoroscopic electronic portal imaging device

Medical Physics, 1999
A method is presented for verification of compensator thicknesses using a fluoroscopic electronic portal imaging device (EPID). The method is based on the measured transmission through the compensator, defined by the ratio of the portal dose with the compensator in the beam and the portal dose without the compensator in the beam.
Pasma, KL (Kasper) +4 more
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Portal dose image verification: the collapsed cone superposition method applied with different electronic portal imaging devices

Physics in Medicine and Biology, 2006
Two different commercial electronic portal imaging devices (EPIDs), one based on a liquid ion chamber matrix and the other based on a fluoroscopic CCD camera, were used to acquire readings that, through a calibration procedure, provided images proportional to the absolute dose to a virtual water slab located at the EPID plane. The transformation of the
Christina Vallhagen, Dahlgren +3 more
openaire +2 more sources

A multipurpose phantom for use with electronic portal imaging devices

Physics in Medicine and Biology, 1995
A simple, low-cost, multipurpose phantom has been designed for use with electronic portal imaging devices (EPIDS). Making use of the high spatial resolution of an EPID, together with the built in software tools for measuring distances, it is possible to verify x-ray/light field size and congruence, at any gantry angle, for fields up to 200 mm x 200 mm.
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Electronic portal imaging devices

2022
openaire +1 more source

Quality metrics in electronic portal imaging devices