Pixel sensitivity variations in a CdTe-Medipix2 detector using poly-energetic x-rays

被引：19

作者：

Aamir, R. ^{[1
]}

Lansley, S. P. ^{[1
,2
]}

Zainon, R. ^{[1
]}

Fiederle, M. ^{[3
]}

Fauler, A. ^{[3
]}

Greiffenberg, D. ^{[3
]}

Butler, P. H. ^{[1
,4
]}

Butler, A. P. H. ^{[4
,5
,6
]}

机构：

[1] Univ Canterbury, Dept Phys & Astron, Christchurch 1, New Zealand

[2] Univ Canterbury, MacDiarmid Inst Adv Mat & Nanotechnol, Christchurch 1, New Zealand

[3] Univ Freiburg, Freiburger Mat Forschungszentrum, D-7800 Freiburg, Germany

[4] CERN, European Ctr Nucl Res, Geneva, Switzerland

[5] Univ Canterbury, Dept Elect & Comp Engn, Christchurch 1, New Zealand

[6] Univ Otago, Dept Radiol, Christchurch, New Zealand

来源：

JOURNAL OF INSTRUMENTATION | 2011年 / 6卷

关键词：

Solid state detectors; X-ray detectors; Pixelated detectors and associated VLSI electronics; Hybrid detectors; DATA-ACQUISITION; MEDIPIX2;

D O I：

10.1088/1748-0221/6/01/C01059

中图分类号：

TH7 [仪器、仪表];

学科分类号：

080401 [精密仪器及机械];

摘要：

We have a 1-mm-thick cadmium telluride (CdTe) sensor bump-bonded to a Medipix2 readout chip. This detector has been characterized using a poly-energetic x-ray beam. Open beam images (i.e. without an attenuating specimen between the x-ray source and the detector) have been acquired at room temperature using the MARS-CT system. Profiles of various rows and columns were analyzed for one hundred, 35-ms exposures taken with a bias voltage of -300 V (operating in electron collection mode). A region of increased sensitivity is observed around the edges of the detector. A reasonably periodic, repeatable variation in pixel sensitivity is observed. Some small regions with very low sensitivity and others with zero signals are also observed. Surrounding these regions are circular rings of pixels with higher counts. At higher flux (higher tube current in the x-ray source) there is evidence of saturation of the detector assembly. In this paper we present our understanding of the origin of these features and demonstrate the improved image quality obtained after correcting for these variations.

引用

页数：10

共 10 条

[1]

[Anonymous], 2000, THESIS U VIENNA AUST

[2]

An interface board for the control and data acquisition of the Medipix2 chip [J].

Bello, DS ;

van Beuzekom, M ;

Jansweijer, P ;

Verkooijen, H ;

Visschers, J .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2003, 509 (1-3) :164-170

[3]

Bio-medical X-ray imaging with spectroscopic pixel detectors [J].

Butler, A. P. H. ;

Anderson, N. G. ;

Tipples, R. ;

Cook, N. ;

Watts, R. ;

Meyer, J. ;

Bell, A. J. ;

Melzer, T. R. ;

Butler, P. H. .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2008, 591 (01) :141-146

[4]

Butler P.H., 2008, INT S PEAC APPL NUCL

[5]

Data acquisition and processing software package for Medipix2 [J].

Holy, T ;

Jakubek, J ;

Pospisil, S ;

Uher, J ;

Vavrik, D ;

Vykydal, Z .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2006, 563 (01) :254-258

[6]

New trends in CdTe and CdZnTe detectors for X- and gamma-ray applications [J].

Limousin, O .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2003, 504 (1-3) :24-37

[7]

Lutz G., 1999, Semiconductor Radiation Detectors: Device Physics, DOI DOI 10.1007/978-3-540-71679-2

[8]

Development of segmented semiconductor arrays for quantum imaging [J].

Mikulec, B .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2003, 510 (1-2) :1-23

[9]

Spectroscopic X-ray imaging with photon counting pixel detectors [J].

Tlustos, L. .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2010, 623 (02) :823-828

[10]

Medipix2: Processing and measurements of GaAs pixel detectors [J].

Zwerger, Andreas ;

Fauler, Alex ;

Fiederle, Michael ;

Jakobs, Karl .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 2007, 576 (01) :23-26

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