Reducing motion artifact in sequential-scan dual-energy CT imaging by incorporating deformable registration within joint statistical image reconstruction

Tao Ge, Rui Liao, David G. Politte, Maria Medrano, Jeffrey Williamson, Bruce R. Whiting, Tianyu Zhao, Joseph A. O'Sullivan

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

Dual-energy computed tomography (DECT) has been widely used to reconstruct basis components. In previous studies, our DECT algorithm has shown high accuracy in stopping power ratio (SPR) estimation of fixed objects for proton radiotherapy planning. However, patient movement between sequential data acquisitions may lead to severe motion artifacts in the component images. In order to reduce or eliminate the motion artifacts in clinical applications, we combine a deformable registration method with an accurate joint statistical iterative reconstruction algorithm, dual-energy alternating minimization (DEAM). Image registration is a process of geometrically aligning two or more images. We implement a multi-modality symmetric deformable registration method based on Advanced Normalization Tools (ANTs) to automatically align the scans we acquire for the same patient. The precalculated registration mapping and its inverse are then embedded into each iteration of the DEAM algorithm. The performance of warped DEAM is quantitatively assessed. Theoretically, the performance of warped DEAM on moved patients should be comparable to the performance of the original DEAM algorithm on fixed objects. The warped DEAM algorithm reduces motion artifacts while preserving the accuracy of the iterative joint statistical CT reconstruction algorithm, which enables us to reconstruct accurate results from sequentially scanned dual-energy patient data.

Original languageEnglish
JournalIS and T International Symposium on Electronic Imaging Science and Technology
Volume2021
Issue number15
DOIs
StatePublished - 2021
Event19th Conference on Computational Imaging, COIMG 2021 - Virtual, Online, United States
Duration: Jan 11 2021Jan 28 2021

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