Measurements of X-ray imaging performance of granular phosphors with direct-coupled CMOS sensors

Min Kook Cho, Ho Kyung Kim, Thorsten Graeve, Seung Man Yun, Chang Hwy Lim, Hyosung Cho, Jung Min Kim

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

For Gd2O2S:Tb granular phosphor screens having a wide range of mass thicknesses, we have investigated the fundamental imaging performance in terms of modulation-transfer function (MTF), noise-power spectrum (NPS) and detective quantum efficiency (DQE). As an optical photon readout device, a CMOS photodiode array with a pitch of 48 μm was used. Under the representative radiation quality, RQA 5, recommended by the IEC (International Electrotechnical Commission, Report 1267), the MTF was measured using a slanted-slit method to avoid aliasing and the NPS was determined by two-dimensional (2D) Fourier analysis of white images. The DQE was assessed from the measured MTF, NPS and the estimated photon fluence. Figure-of-merit (FOM) curves are presented to describe the tradeoff between the X-ray sensitivity and spatial resolution of screens as a function of mass thickness. This study will be useful for the selection guidance of Gd2O2S:Tb phosphors for the relevant imaging tasks of digital radiography.

Original languageEnglish
Article number4545083
Pages (from-to)1338-1343
Number of pages6
JournalIEEE Transactions on Nuclear Science
Volume55
Issue number3
DOIs
Publication statusPublished - 2008 Jun 1

Fingerprint

Optical transfer function
modulation transfer function
noise spectra
Power spectrum
Phosphors
phosphors
power spectra
CMOS
Quantum efficiency
Imaging techniques
X rays
quantum efficiency
sensors
Sensors
Photons
x rays
Fourier analysis
Radiography
photons
radiography

Keywords

  • Detective quantum efficiency
  • Digital radiography
  • Granular phosphor
  • Modulation-transfer function
  • Noise-power spectrum

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering

Cite this

Measurements of X-ray imaging performance of granular phosphors with direct-coupled CMOS sensors. / Cho, Min Kook; Kim, Ho Kyung; Graeve, Thorsten; Yun, Seung Man; Lim, Chang Hwy; Cho, Hyosung; Kim, Jung Min.

In: IEEE Transactions on Nuclear Science, Vol. 55, No. 3, 4545083, 01.06.2008, p. 1338-1343.

Research output: Contribution to journalArticle

Cho, Min Kook ; Kim, Ho Kyung ; Graeve, Thorsten ; Yun, Seung Man ; Lim, Chang Hwy ; Cho, Hyosung ; Kim, Jung Min. / Measurements of X-ray imaging performance of granular phosphors with direct-coupled CMOS sensors. In: IEEE Transactions on Nuclear Science. 2008 ; Vol. 55, No. 3. pp. 1338-1343.
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