A new approach for the pixel map sensitivity (PMS) evaluation of an electronic portal imaging device (EPID).

ABSTRACT: When using an electronic portal imaging device (EPID) for dosimetric verifications, the calibration of the sensitive area is of paramount importance. Two calibration methods are generally adopted: one, empirical, based on an external reference dosimeter or on multiple narrow beam irradiations, and one based on the EPID response simulation. In this paper we present an alternative approach based on an intercalibration procedure, independent from external dosimeters and from simulations, and is quick and easy to perform. Each element of a detector matrix is characterized by a different gain; the aim of the calibration procedure is to relate the gain of each element to a reference one. The method that we used to compute the relative gains is based on recursive acquisitions with the EPID placed

SUBMITTER: Boriano A 

PROVIDER: S-EPMC5714628 | biostudies-literature | 2013 Nov

REPOSITORIES: biostudies-literature