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Proceedings Paper

Development of a novel energy-resolved photon-counting detector for gamma ray imaging applications
Author(s): L.-J. Meng; J. W. Tan; K. Spartiotis; T. Schulman
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Paper Abstract

In this paper, we present the design and preliminary performance evaluation of a novel energy-resolved photon-counting (ERPC) detector for gamma ray imaging applications. The prototype ERPC detector has an active area of 4.4 cm x 4.4 cm, which is pixelated into 128 x 128 square pixels with a pitch size of 350 μm 350 μm. The current detector consists of multiple detector hybrids, each with a CdTe crystal of 1.1 cm x 2.2 cm x 1 mm, bump-bonded onto a customdesigned application-specific integrated circuit (ASIC). The ERPC ASIC has 2048 readout channels arranged in a 3264 array. Each channel is equipped with pre- and shaping-amplifiers, a discriminator, peak/hold circuitry, and an analog-todigital converter (ADC) for digitizing the signal amplitude. In order to compensate for the pixel-to-pixel variation, two 8-bit DACs are implemented into each channel for tuning the gain and offset. The ERPC detector is designed to offer a high spatial resolution, a wide dynamic range of 12-200 keV and a good energy resolution of 3-4 keV. The hybrid detector configuration provides a flexible detection area that can be easily tailored for different imaging applications. The intrinsic performance of a prototype ERPC detector was evaluated with various gamma ray sources, and the results are presented.

Paper Details

Date Published: 11 September 2009
PDF: 6 pages
Proc. SPIE 7449, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI, 74490I (11 September 2009); doi: 10.1117/12.830002
Show Author Affiliations
L.-J. Meng, Univ. of Illinois at Urbana-Champaign (United States)
J. W. Tan, Univ. of Illinois at Urbana-Champaign (United States)
K. Spartiotis, Oy AJAT Ltd. (Finland)
T. Schulman, Oy AJAT Ltd. (Finland)


Published in SPIE Proceedings Vol. 7449:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XI
Ralph B. James; Larry A. Franks; Arnold Burger, Editor(s)

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