Abstract
For the optimal clinical performance of a digital radiographic system employing storage phosphors (imaging plates, IPs), it is important to be able to characterize the basic imaging properties of the system. Resolution property of the digital system is one of them. We devised a method to measure the modulation transfer function (MTF) of imaging plates by utilizing their property of "instantaneously emitted light". Conventional slit technique for screen/film systems was used to obtain the MTFs. The intensity of instantaneously emitted light from a standard type of IP (ST, Fuji Photo Film Co. ) was found to be approximately equal to the light intensity from medium-speed intensifying screens (BH-III). It was found that the MTF of ST was similar to that of medium-speed screen/film (BH-III/RX) system, and also that the MTF of high-resolution type of IP (HR) was superior to that of ST but inferior to that of high-resolution-type screen/film (Hi-mammo/MI-NC) system for mammography.
