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Dosimetry with a fluoroscopic electronic portal imaging device

, 1999
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Dosimetric investigation and portal dose image prediction using an amorphous silicon electronic portal imaging device

Medical Physics, 2001
A two step algorithm to predict portal dose images in arbitrary detector systems has been developed recently. The current work provides a validation of this algorithm on a clinically available, amorphous silicon flat panel imager. The high‐atomic number, indirect amorphous silicon detector incorporates a gadolinium oxysulfide phosphor scintillating ...
B M, McCurdy, K, Luchka, S, Pistorius
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Transmission dosimetry with a liquid-filled electronic portal imaging device

International Journal of Radiation Oncology*Biology*Physics, 1996
To assess the accuracy of transmission dose rate measurements for various phantom-detector geometries, performed with an electronic portal imaging device (EPID) and to compare these transmission dose rate values with exit dose rate data.Transmission dose rate values on the central beam axis and beam profiles were measured with an EPID consisting of a ...
Essers, Marion, Boellaard, Ronald, Van Herk, Marcel, Lanson, Hugo, Mijnheer, Ben   +4 more
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Measurement possibilities using an electronic portal imaging device

Medical Dosimetry, 1993
A vital role in the quality control of radiotherapy is the use of portal imaging for verifying field size, shape, orientation and patient set-up. Coincidence of treated volume and target volume is imperative. Electronic portal imaging devices are effective at providing this verification.
M C, Kirby, P C, Williams
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An electronic portal imaging device for transit dosimetry

Physics in Medicine and Biology, 1997
An electronic portal imaging device has been designed and constructed. It consists of an array of 128 CsI scintillation crystals coupled to photodiodes which is scanned across the field in 4 seconds. The linac is operated at a dose rate of 400 cGy min-1 and the dose delivered for image acquisition is approximately 27 cGy.
SymondsTayler, JRN, Partridge, M, Evans, PM   +2 more
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Use of electronic portal imaging devices for electron treatment verification

Australasian Physical & Engineering Sciences in Medicine, 2015
This study aims to help broaden the use of electronic portal imaging devices (EPIDs) for pre-treatment patient positioning verification, from photon-beam radiotherapy to photon- and electron-beam radiotherapy, by proposing and testing a method for acquiring clinically-useful EPID images of patient anatomy using electron beams, with a view to enabling ...
Kairn, T., Aland, T., Crowe, S. B., Trapp, J. V.   +3 more
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Routine individualised patient dosimetry using electronic portal imaging devices

Radiotherapy and Oncology, 2007
To analyse the results of routine EPID measurements for individualised patient dosimetry.Calibrated camera-based EPIDs were used to measure the central field dose, which was compared with a dose prediction at the EPID level. For transit dosimetry, dose data were calculated using patient transmission and scatter, and compared with measured values ...
Sebastiaan M J J G, Nijsten, Ben J, Mijnheer, André L A J, Dekker, Philippe, Lambin, André W H, Minken   +4 more
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An objective method for evaluating electronic portal imaging devices

Medical Physics, 1994
A statistical technique is described for analyzing the image of a contrast‐detail phantom acquired by a radiotherapy electronic portal imaging device. By using Student's t test, the image analysis algorithm computes which holes in the contrast‐detail phantom can be objectively resolved from the background signal.
L, Dong, A L, Boyer
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Lung compensator design using an electronic portal imaging device

Medical Dosimetry, 1999
Using a liquid filled electronic portal imaging device (EPID) installed on a linear accelerator and a composite chest phantom, exit dose measurements were carried out to establish an empirical relationship between the pixel values of the imaging detector and the corresponding equivalent thickness of the overlying phantom material.
H, Parsaei, S, Hussein, E, el-Khatib
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