Image quality and detection performance of a direct digital radiography system

Tadamitsu Ideguchi, Katsuhiko Matsuda, Kazuhiko Himuro, Rie Kuwahara, Hidetsune Miyazaki, Hiroyuki Hazeyama, Seiji Kumazawa, Yasuyuki Kawaji, Akira Yoshida, Masao Matsumoto, Yoshiharu Higashida

Research output: Contribution to journalArticlepeer-review


The physical characteristics of a direct amorphous Selenium (a-Se) digital fluoroscopy and radiography system were investigated. Pre-sampled modulation transfer functions (MTF) were measured using a slit method. Noise power spectra were determined for different input exposures by fast Fourier transform of uniformly exposed samples. The MTFs of direct digital radiography systems showed significantly higher values than those of indirect digital radiography and screen-film systems. The direct digital radiography systems showed higher noise levels compared with those of indirect systems under roughly the same exposure conditions. Contrast-detail analysis was performed to compare detection by direct digital radiography systems with that of the screen-film (FUJI HG-M2/UR2) systems. 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 digital contrast-detail curves and IQF are, on average, are equal those of the screen-film system.

Original languageEnglish
Pages (from-to)425-433
Number of pages9
JournalNippon Hoshasen Gijutsu Gakkai zasshi
Issue number3
Publication statusPublished - Mar 20 2006
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Medicine(all)


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