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Task based weights for spectral computed tomography
KTH, School of Engineering Sciences (SCI), Physics, Medical Imaging.ORCID iD: 0000-0001-7253-0164
KTH, School of Engineering Sciences (SCI), Physics, Medical Imaging.ORCID iD: 0000-0002-3039-9791
KTH, School of Engineering Sciences (SCI), Physics, Medical Imaging.
2012 (English)In: Progress in Biomedical Optics and Imaging - Proceedings of SPIE, SPIE - International Society for Optical Engineering, 2012, Vol. 8313, 831334- p.Conference paper, Published paper (Refereed)
Abstract [en]

In photon counting multi-bin CT, both projection based weighting and image based weighting (designed to maximize the signal-difference-to-noise ratio SDNR) in the final image, are pixel based and do not account for any spatial frequency dependency of signal and noise among the bins. The same weighting scheme will be used when imaging objects with a large fraction of high spatial frequencies and those with predominantly low spatial frequency content. Any effect on the detectability of a certain target due to correlation between detector elements and bins that might arise in pulse height discriminating systems will not be captured using such an approach. We show how to take the spatial frequency dependency of signal and noise transfer for each bin, and the spatial frequency composition of a target, into account when determining optimal task based weights for photon-counting multi-bin CT imaging using the 2D slice detectability index by applying cascaded system analysis to a spectrally resolved photon counting CT detector system with multiple bins.

Place, publisher, year, edition, pages
SPIE - International Society for Optical Engineering, 2012. Vol. 8313, 831334- p.
Series
Progress in Biomedical Optics and Imaging, ISSN 1605-7422 ; 8313
Keyword [en]
cascaded systems analysis, photon-counting multi-bin, spectral CT, task based weights, 2-D slice, Cascaded system, Computed Tomography, CT detectors, CT imaging, Detectability, Detectability index, Detector elements, High spatial frequency, Image-based, Imaging objects, Low-spatial frequency, Noise transfer, Photon counting, Pulse height, Spatial frequency, Task-based, Weighting scheme, Bins, Medical imaging, Photons, Systems analysis, Computerized tomography
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Other Physics Topics
Identifiers
URN: urn:nbn:se:kth:diva-98182DOI: 10.1117/12.910098ISI: 000304768000107Scopus ID: 2-s2.0-84860380743ISBN: 978-081948962-3 (print)OAI: oai:DiVA.org:kth-98182DiVA: diva2:536824
Conference
Medical Imaging 2012: Physics of Medical Imaging;San Diego, CA; 5 February 2012 through 8 February 2012
Note
QC 20120625Available from: 2012-06-25 Created: 2012-06-20 Last updated: 2012-07-16Bibliographically approved

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