Full breast digital mammography with an amorphous silicon-based flat panel detector: Physical characteristics of a clinical prototype

Srinivasan Vedantham, Andrew Karellas, Sankararaman Suryanarayanan, Douglas Albagli, Sung Han, Eric J. Tkaczyk, Cynthia E. Landberg, Beale Opsahl-Ong, Paul R. Granfors, Ilias Levis, Carl J. D'Orsi, R. Edward Hendrick

Research output: Contribution to journalArticlepeer-review

276 Scopus citations

Abstract

The physical characteristics of a clinical prototype amorphous silicon- based flat panel imager for full-breast digital mammography have been investigated. The imager employs a thin thallium doped CsI scintillator on an amorphous silicon matrix of detector elements with a pixel pitch of 100 μ. Objective criteria such as modulation transfer function (MTF), noise power spectrum, detective quantum efficiency (DQE), and noise equivalent quanta were employed for this evaluation. The presampling MTF was found to be 0.73, 0.42, and 0.28 at 2, 4, and 5 cycles/mm, respectively. The measured DQE of the current prototype utilizing a 28 kVp, Mo-Mo spectrum beam hardened with 4.5 cm Lucite is -55% at close to zero spatial frequency at an exposure of 32.8 mR, and decreases to -40% at a low exposure of 1.3 mR. Detector element nonuniformity and electronic gain variations were not significant after appropriate calibration and software corrections. The response of the imager was linear and did not exhibit signal saturation under tested exposure conditions. (C) 2000 American Association of Physicists in Medicine.

Original languageEnglish (US)
Pages (from-to)558-567
Number of pages10
JournalMedical physics
Volume27
Issue number3
DOIs
StatePublished - Mar 2000
Externally publishedYes

Keywords

  • Breast imaging
  • Detective quantum efficiency (DQE)
  • Digital mammography
  • Image quality
  • Physics

ASJC Scopus subject areas

  • Biophysics
  • Radiology Nuclear Medicine and imaging

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