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

doi:10.1109/TNS.2007.913939

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 journal › Article › peer-review

46 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 language	English
Article number	4545083
Pages (from-to)	1338-1343
Number of pages	6
Journal	IEEE Transactions on Nuclear Science
Volume	55
Issue number	3
DOIs	https://doi.org/10.1109/TNS.2007.913939
Publication status	Published - 2008 Jun

Bibliographical note

Funding Information:
Manuscript received June 17, 2007; revised November 19, 2007. This work was supported by the Korea Science and Engineering Foundation (KOSEF) Grant funded by the Korea Government (MOST) (R01-2006-000-10233-0). M. K. Cho, H. K. Kim, S. M. Yun, and C. H. Lim are with the School of Mechanical Engineering, Pusan National University, Busan 609-735, Korea (e-mail: [email protected]; [email protected]; [email protected]; [email protected]). T. Graeve is with the Rad-icon Imaging Corporation, Santa Clara, CA 95054-2404 USA (e-mail: [email protected]). H. Cho is with the Department of Radiological Science, Yonsei University, Wonju 220-710, Korea (e-mail: [email protected]). J.-M. Kim is with the College of Health Sciences, Korea University, Seoul 136-703, Korea (e-mail: [email protected]). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TNS.2007.913939

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

Access to Document

10.1109/TNS.2007.913939

Cite this

@article{a3b0e573010f4ff18a43e405dfbcafb8,

title = "Measurements of X-ray imaging performance of granular phosphors with direct-coupled CMOS sensors",

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.",

keywords = "Detective quantum efficiency, Digital radiography, Granular phosphor, Modulation-transfer function, Noise-power spectrum",

author = "Cho, {Min Kook} and Kim, {Ho Kyung} and Thorsten Graeve and Yun, {Seung Man} and Lim, {Chang Hwy} and Hyosung Cho and Kim, {Jung Min}",

note = "Funding Information: Manuscript received June 17, 2007; revised November 19, 2007. This work was supported by the Korea Science and Engineering Foundation (KOSEF) Grant funded by the Korea Government (MOST) (R01-2006-000-10233-0). M. K. Cho, H. K. Kim, S. M. Yun, and C. H. Lim are with the School of Mechanical Engineering, Pusan National University, Busan 609-735, Korea (e-mail: [email protected]; [email protected]; [email protected]; [email protected]). T. Graeve is with the Rad-icon Imaging Corporation, Santa Clara, CA 95054-2404 USA (e-mail: [email protected]). H. Cho is with the Department of Radiological Science, Yonsei University, Wonju 220-710, Korea (e-mail: [email protected]). J.-M. Kim is with the College of Health Sciences, Korea University, Seoul 136-703, Korea (e-mail: [email protected]). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TNS.2007.913939",

year = "2008",

month = jun,

doi = "10.1109/TNS.2007.913939",

language = "English",

volume = "55",

pages = "1338--1343",

journal = "IEEE Transactions on Nuclear Science",

issn = "0018-9499",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "3",

}

TY - JOUR

T1 - Measurements of X-ray imaging performance of granular phosphors with direct-coupled CMOS sensors

AU - Cho, Min Kook

AU - Kim, Ho Kyung

AU - Graeve, Thorsten

AU - Yun, Seung Man

AU - Lim, Chang Hwy

AU - Cho, Hyosung

AU - Kim, Jung Min

N1 - Funding Information: Manuscript received June 17, 2007; revised November 19, 2007. This work was supported by the Korea Science and Engineering Foundation (KOSEF) Grant funded by the Korea Government (MOST) (R01-2006-000-10233-0). M. K. Cho, H. K. Kim, S. M. Yun, and C. H. Lim are with the School of Mechanical Engineering, Pusan National University, Busan 609-735, Korea (e-mail: [email protected]; [email protected]; [email protected]; [email protected]). T. Graeve is with the Rad-icon Imaging Corporation, Santa Clara, CA 95054-2404 USA (e-mail: [email protected]). H. Cho is with the Department of Radiological Science, Yonsei University, Wonju 220-710, Korea (e-mail: [email protected]). J.-M. Kim is with the College of Health Sciences, Korea University, Seoul 136-703, Korea (e-mail: [email protected]). Color versions of one or more of the figures in this paper are available online at http://ieeexplore.ieee.org. Digital Object Identifier 10.1109/TNS.2007.913939

PY - 2008/6

Y1 - 2008/6

N2 - 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.

AB - 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.

KW - Detective quantum efficiency

KW - Digital radiography

KW - Granular phosphor

KW - Modulation-transfer function

KW - Noise-power spectrum

UR - http://www.scopus.com/inward/record.url?scp=45849115147&partnerID=8YFLogxK

U2 - 10.1109/TNS.2007.913939

DO - 10.1109/TNS.2007.913939

M3 - Article

AN - SCOPUS:45849115147

SN - 0018-9499

VL - 55

SP - 1338

EP - 1343

JO - IEEE Transactions on Nuclear Science

JF - IEEE Transactions on Nuclear Science

IS - 3

M1 - 4545083

ER -

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this