title: Effect of readout direction in the edge profile on the modulation transfer function of computed radiographic systems by use of the edge method.
abstract: We investigated the effect of the readout direction of the edge profile obtained by the edge method on the presampled modulation transfer function (MTF) in various computed radiographic (CR) systems. There were no differences in the MTFs derived from two edge profiles in the sub-scanning direction of four CR systems used in this study. On the other hand, the MTFs measured at a readout direction from the low (edge) to the high (direct exposure) exposure region were higher than those measured at a readout direction from the high to the low exposure region in the laser-beam scanning direction for three of the four CR systems. Although this phenomenon depends on the CR system, it is important to understand and indicate both MTFs at the two edge profiles in the laser-beam scanning direction for accurate assessment of the resolution property.
authors.affiliation: Department of Health Sciences, Graduate School of Medical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan. nobukazu.tanaka@gmail.com
authors.forename: Nobukazu
authors.initials: N
authors.lastname: Tanaka
authors.forename: Junji
authors.initials: J
authors.lastname: Morishita
authors.forename: Norisato
authors.initials: N
authors.lastname: Tsuda
authors.forename: Masafumi
authors.initials: M
authors.lastname: Ohki
mesh_terms: D003198:Computer Simulation; D006801:Humans; D007091:Image Processing, Computer-Assisted; D011856:Radiographic Image Enhancement; D011857:Radiographic Image Interpretation, Computer-Assisted; D014963:X-Ray Intensifying Screens