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Robustness of optimal energy thresholds in photon-counting spectral CT
KTH, School of Engineering Sciences (SCI), Physics.
Prismat Sensors AB, Roslagstullsbacken 21, S-10691 Stockholm, Sweden..
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
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2020 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 953, article id 163132Article in journal (Refereed) Published
Abstract [en]

An important question when developing photon-counting detectors for computed tomography is how to select energy thresholds. In this work thresholds are optimized by maximizing signal-difference-to-noise ratio squared (SDNR2) in an optimally weighted image and signal-to-noise ratio squared (SNR2) in a gadolinium basis image in a silicon-strip detector and a cadmium zinc telluride (CZT) detector, factoring in pileup and imperfect energy response based on real-world detector systems. To investigate to what extent one single set of thresholds could be applied in various imaging tasks, the robustness of optimal thresholds with 2 to 8 bins is examined with the variation of phantom thicknesses, target materials and detector configurations. In contrast to previous studies, the optimal threshold locations do not always increase with increasing attenuation if pileup is included. With respect to the tradeoff between higher SDNR2 or SNR2 and less data, setting optimal thresholds for a 30 cm phantom yields robust SDNR2 and setting optimal thresholds for a 50 cm phantom yields robust SNR2 with 6 to 8 bins in the silicon-strip detector. Furthermore, setting optimal thresholds for a 30 cm phantom yields robust SDNR2 or SNR2 with 6 to 8 bins and a pixel size less than or equal to 0.5 x 0.5 mm(2) in the CZT detector.

Place, publisher, year, edition, pages
ELSEVIER , 2020. Vol. 953, article id 163132
Keywords [en]
Photon counting, Spectral CT, Threshold optimization, Silicon-strip detector, CZT detector
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:kth:diva-266924DOI: 10.1016/j.nima.2019.163132ISI: 000506419900072Scopus ID: 2-s2.0-85077107800OAI: oai:DiVA.org:kth-266924DiVA, id: diva2:1393204
Note

QC 20200214

Available from: 2020-02-14 Created: 2020-02-14 Last updated: 2020-02-14Bibliographically approved

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Grönberg, FredrikXu, ChengDanielsson, MatsPersson, Mats

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