Basic imaging properties of a computed radiographic system with photostimulable phosphors

Hiroshi Fuiita, Katsuhiko Ueda, Junii Morishita, Tsuvoshi Fuiikawa, Akivoshi Ohtsuka, Tokuai Sai

研究成果: Contribution to journalArticle査読

68 被引用数 (Scopus)


We measured the characteristic curve, modulation transfer function (MTF), and the Wiener spectrum of a commercially available computed radiographic (CR) system with photostimulable phosphor plate (imaging plate, IP). The characteristic curve (system response) obtained by an inverse-square x-ray sensitometry showed a wide dynamic range (order of 103 in maximum). The slit technique was employed to determine the MTF’s, such as IP MTF, presampling MTF including the unsharpness of the detector (IP) and the blurring effect of the sampling aperture, and laser-printer MTF. It was found that the MTF of the standard type of IP was comparable to that of medium-speed screen/film systems. The noticeable degradation of resolution in our CR system, however, occurred at the stage of image data sampling: the presampling MTF was inferior to the IP MTF due to the effect of the scattering and resultant spreading of the incident laser beam and the emitted luminescence. The noise was characterized by means of digital Wiener spectrum using uniformly exposed noise data. Exposure ranges could be separated into different sections depending upon the noise sources, such as quantum mottle at low exposure and system structure noise at high exposure.

ジャーナルMedical physics
出版ステータス出版済み - 1 1989

All Science Journal Classification (ASJC) codes

  • 生物理学
  • 放射線学、核医学およびイメージング


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