Portal Imaging Devices

Authored by: Cephas Mubata

Handbook of Radiotherapy Physics

Print publication date:  June  2007
Online publication date:  June  2007

Print ISBN: 9780750308601
eBook ISBN: 9781420012026
Adobe ISBN:


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When a patient is treated, it is just as important that the radiation should be delivered to the correct anatomical site as it is that the correct dose should be delivered. With the advent of conformal radiotherapy, the requirements for positional accuracy are increased. Traditionally, quality assurance of patient positioning has been achieved using industrial x-ray film, but film needs to be processed, and the information is only available some time after the treatment fraction has been delivered. In order to provide an instantaneous verification of the patient setup, electronic portal imaging devices (EPIDs) have been developed that are attached to the gantry of the linear accelerator.

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