title: [Full-field digital mammography with amorphous silicon-based flat- panel detector: physical imaging characteristics and signal detection].
abstract: The physical characteristics of a clinical amorphous silicon-based flat-panel imager for full-field digital mammography were investigated. Pre-sampled modulation transfer functions (MTF) were measured by using a slit method. Noise power spectra were determined for different input exposures by fast Fourier transform. The MTFs of full-field digital mammography systems showed significantly higher values than those of the computed radiography (CR) system. The full-field digital mammography system showed a lower noise level than that of the CR system under the same exposure conditions. Contrast detail analysis has been performed to compare the detectability of the full-field digital mammography system with that of the screen-film (Min-R 2000/Min-R 2000) system. The average contrast-detail curves of digital and film images were obtained from the results of observation. Image quality figures (IQF) were also calculated from the individual observer performance tests. The results indicated that the digital contrast-detail curves and IQF, on average, are superior to those of the screen-film system.
authors.affiliation: Department of Radiology, Clinical Research Institute, National Kyushu Medical Center.
authors.forename: Tadamitsu
authors.initials: T
authors.lastname: Ideguchi
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Higashida
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Himuro
authors.forename: Masafumi
authors.initials: M
authors.lastname: Ohki
authors.forename: Satoru
authors.initials: S
authors.lastname: Nakamura
authors.forename: Akira
authors.initials: A
authors.lastname: Yoshida
authors.forename: Rie
authors.initials: R
authors.lastname: Takagi
authors.forename: Hirohide
authors.initials: H
authors.lastname: Hatano
authors.forename: Rie
authors.initials: R
authors.lastname: Kuwahara
authors.forename: Makiko
authors.initials: M
authors.lastname: Toyonaga
authors.forename: Isamu
authors.initials: I
authors.lastname: Tanaka
authors.forename: Fukai
authors.initials: F
authors.lastname: Toyofuku
mesh_terms: D005583:Fourier Analysis; D008327:Mammography / Q000295:instrumentation*; D019047:Phantoms, Imaging; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D012825:Silicon
chemical_list: D012825:Silicon