A prototype spatial-spectral CT system for material decomposition with energy-integrating detectors.

Medical Physics
Matthew TivnanJ Webster Stayman

Abstract

Spectral CT has great potential for a variety of clinical applications due to improved tissue and material discrimination over conventional single-energy CT. Many clinical and preclinical spectral CT systems have two spectral channels enabling dual-energy CT. Strategies include split filtration, dual-layer detectors, photon-counting detectors, and kVp switching. The motivation for this work is the development of an x-ray source spectral modulation device with three or more spectral channels to enable high-sensitivity multi-material decomposition with energy-integrating detectors. We present spatial-spectral filters which are a new x-ray source modulation technology with the potential for additional channel diversity. The filtering device consists of an array of K-edge materials which divide the x-ray beam into spectrally varied beamlets. This design allows for an arbitrary number of spectral channels-trading off spatial and spectral information. We use a one-step model-based material decomposition (MBMD) algorithm to iteratively estimate material density images directly from the spatial-spectral CT data. In this work, we present a prototype spatial-spectral filter integrated with an x-ray CT test bench. The filter is composed o...Continue Reading

References

Oct 5, 2013·Medical Physics·Katsuyuki Taguchi, Jan S Iwanczyk
May 8, 2014·IEEE Transactions on Medical Imaging·Yong Long, Jeffrey A Fessler
Aug 28, 2014·IEEE Transactions on Medical Imaging·Donghwan KimJeffrey A Fessler
Aug 25, 2015·Radiology·Cynthia H McColloughJoel G Fletcher
Dec 19, 2018·Physics in Medicine and Biology·Steven TilleyJ Webster Stayman
Jun 1, 2019·Proceedings of SPIE·Wenying WangJ Webster Stayman
Jun 1, 2019·Proceedings of SPIE·Matthew TivnanJ Webster Stayman
Dec 11, 2020·Proceedings of SPIE·Matthew TivnanJ Webster Stayman

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