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[Canon's flat-panel detector].

Masao Matsumoto1, Iori Sumida, Tadamitsu Ideguchi

  • 1School of Allied Health Sciences, Faculty of Medicine, Osaka University. matsumot@sahs.med.osaka-u.ac.jp

Igaku Butsuri : Nihon Igaku Butsuri Gakkai Kikanshi = Japanese Journal of Medical Physics : an Official Journal of Japan Society of Medical Physics
|May 27, 2003
PubMed
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Flat-panel detectors (FPDs) and computed radiography (FCR) offer wider dynamic range than screen-film (S/F) systems. While FPDs show slightly better imaging properties at lower frequencies, both digital systems have lower overall modulation transfer function (MTF) and noise equivalent quanta (NEQ) than S/F.

Area of Science:

  • Medical Imaging Physics
  • Radiological Technology

Background:

  • Screen-film (S/F) systems have been the standard in medical imaging.
  • Digital imaging technologies like flat-panel detectors (FPDs) and computed radiography (FCR) offer potential improvements.

Purpose of the Study:

  • To quantitatively compare the imaging performance of FPD, FCR, and S/F systems.
  • To evaluate key imaging properties including characteristic curve, modulation transfer function (MTF), Wiener spectrum (WS), and noise equivalent quanta (NEQ).

Main Methods:

  • Imaging systems evaluated: Cannon FPD, Fuji FCR, and a standard S/F system.
  • Key imaging properties measured: characteristic curve, pre-sampling and overall MTF, WS, and NEQ.
  • Image quality assessed using a chest phantom.

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Main Results:

  • FPD and FCR systems demonstrated wider dynamic range compared to S/F.
  • FPD showed slightly superior pre-sampling and overall MTF at low frequencies (<0.8 mm⁻¹), but both digital systems had lower overall MTF than S/F.
  • Digital systems generally had worse overall Wiener Spectrum and Noise Equivalent Quanta (NEQ) compared to S/F, though FPD performed comparably or better than FCR.
  • Chest phantom images indicated FPD image quality was comparable or superior to FCR.

Conclusions:

  • Flat-panel detectors (FPDs) are a viable and useful technology in radiology departments, offering comparable or superior image quality to computed radiography (FCR).
  • Digital image processing enhances the utility of FPDs.
  • While digital systems offer advantages like wider dynamic range, careful consideration of MTF and NEQ trade-offs compared to traditional screen-film systems is necessary.