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Modelling the channel-wise count response of a photon-counting spectral CT detector to a broad x-ray spectrum
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.ORCID iD: 0000-0001-8560-3262
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.
KTH, School of Engineering Sciences (SCI), Physics, Physics of Medical Imaging.ORCID iD: 0000-0002-3039-9791
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2015 (English)In: Medical Imaging 2015: Physics of Medical Imaging, 2015, Vol. 9412, 941215Conference paper, Published paper (Refereed)
Abstract [en]

Variations among detector channels in CT very sensitively lead to ring artefacts in the reconstructed images. For material decomposition in the projection domain, the variations can result in intolerable biases in the material line integral estimates. A typical way to overcome these effects is to apply calibration methods that try to unify spectral responses from different detector channels to an ideal response from a detector model. However, the calibration procedure can be rather complex and require excessive calibration measurements for a multitude of combinations of x-ray shapes, tissue combinations and thicknesses. In this paper, we propose a channel-wise model for a multibin photon-counting detector for spectral CT. Predictions of this channel-wise model match well with their physical performances, which can thus be used to eliminate ring artefacts in CT images and achieve projection-basis material decomposition. In an experimental validation, image data show significant improvement with respect to ring artefacts compared to images calibrated with flat-fielding data. Projection-based material decomposition gives basis material images showing good separation among individual materials and good quantification of iodine and gadolinium contrast agents. The work indicates that the channel-wise model can be used for quantitative CT with this detector.

Place, publisher, year, edition, pages
2015. Vol. 9412, 941215
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
URN: urn:nbn:se:kth:diva-170713DOI: 10.1117/12.2081776ISI: 000355581700038Scopus ID: 2-s2.0-84943327631ISBN: 978-1-62841-502-5 (print)OAI: oai:DiVA.org:kth-170713DiVA: diva2:839959
Conference
Conference on Medical Imaging - Physics of Medical Imaging, FEB 22-25, 2015, Orlando, FL
Note

QC 20150706

Available from: 2015-07-06 Created: 2015-07-03 Last updated: 2015-07-06Bibliographically approved

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Chen, HanPersson, Mats

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Liu, XuejinChen, HanBornefalk, HansDanielsson, MatsKarlsson, StaffanPersson, MatsXu, ChengHuber, Ben
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