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Increased count-rate performance and dose efficiency for silicon photon-counting detectors for full-field CT using an ASIC with adjustable shaping time
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
Stanford Univ, Dept Bioengn, Stanford, CA 94305 USA..
Prismat Sensors AB, SE-58330 Linkoping, Sweden..
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.ORCID iD: 0000-0002-8626-495X
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2019 (English)In: MEDICAL IMAGING 2019: PHYSICS OF MEDICAL IMAGING / [ed] Schmidt, TG Chen, GH Bosmans, H, SPIE-INT SOC OPTICAL ENGINEERING , 2019, article id 109481WConference paper, Published paper (Refereed)
Abstract [en]

Photon-counting silicon strip detectors are attracting interest for use in next generation CT scanners. For silicon detectors, a low noise floor is necessary to obtain a good dose efficiency. A low noise floor can be achieved by having a filter with a long shaping time in the readout electronics. This also increases the pulse length, resulting in a long deadtime and thereby a degraded count-rate performance. However, as the flux typically varies greatly during a CT scan, a high count-rate capability is not required for all projection lines. It would therefore be desirable to use more than one shaping time within a single scan. To evaluate the potential benefit of using more than one shaping time, it is of interest to characterize the relation between the shaping time, the noise, and the resulting pulse shape. In this work we present noise and pulse shape measurements on a photon-counting detector with two different shaping times along with a complementary simulation model of the readout electronics. We show that increasing the shaping time from 28.1 ns to 39.4 ns decreases the noise and increases the signal-to-noise ratio (SNR) with 6.5% at low count rates and we also present pulse shapes for each shaping time as measured at a synchrotron source. Our results demonstrate that the shaping time plays an important role in optimizing the dose efficiency in a photon-counting x-ray detector.

Place, publisher, year, edition, pages
SPIE-INT SOC OPTICAL ENGINEERING , 2019. article id 109481W
Series
Proceedings of SPIE, ISSN 0277-786X ; 10948
Keywords [en]
dose efficiency, silicon detector, shaping time, ASIC, photon-counting
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:kth:diva-260218DOI: 10.1117/12.2512826ISI: 000483585700064Scopus ID: 2-s2.0-85068419335ISBN: 978-1-5106-2544-0 (print)OAI: oai:DiVA.org:kth-260218DiVA, id: diva2:1355753
Conference
Conference on Medical Imaging - Physics of Medical Imaging, FEB 17-20, 2019, San Diego, CA
Note

QC 20190930

Available from: 2019-09-30 Created: 2019-09-30 Last updated: 2019-09-30Bibliographically approved

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Sundberg, ChristelSjölin, MartinDanielsson, Mats

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