Basic imaging properties of a computed radiographic system with photostimulable phosphors

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

Research output: Contribution to journalArticle

65 Citations (Scopus)

Abstract

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 10 3 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.

Original languageEnglish
Pages (from-to)52-59
Number of pages8
JournalMedical physics
Volume16
Issue number1
DOIs
Publication statusPublished - Jan 1 1989
Externally publishedYes

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Noise
Lasers
Luminescence
X-Rays

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Radiology Nuclear Medicine and imaging

Cite this

Basic imaging properties of a computed radiographic system with photostimulable phosphors. / Fuiita, Hiroshi; Ueda, Katsuhiko; Morishita, Junji; Fuiikawa, Tsuvoshi; Ohtsuka, Akivoshi; Sai, Tokuai.

In: Medical physics, Vol. 16, No. 1, 01.01.1989, p. 52-59.

Research output: Contribution to journalArticle

Fuiita, Hiroshi ; Ueda, Katsuhiko ; Morishita, Junji ; Fuiikawa, Tsuvoshi ; Ohtsuka, Akivoshi ; Sai, Tokuai. / Basic imaging properties of a computed radiographic system with photostimulable phosphors. In: Medical physics. 1989 ; Vol. 16, No. 1. pp. 52-59.
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