Motion-compensated reconstruction for limited-angle multiphase cardiac CT

Mingwu Jin; Cong Zhao; Xun Jia; Lifeng Yu

doi:10.1117/12.2294922

9 March 2018 Motion-compensated reconstruction for limited-angle multiphase cardiac CT

Mingwu Jin, Cong Zhao, Xun Jia, Lifeng Yu

Proceedings Volume 10573, Medical Imaging 2018: Physics of Medical Imaging; 1057333 (2018) https://doi.org/10.1117/12.2294922
Event: SPIE Medical Imaging, 2018, Houston, Texas, United States

Abstract

ECG-gated multiphase cardiac CT (MP-CCT) is free of motion artifacts and can provide the extra information of cardiac functions for the diagnosis of coronary artery disease. Used majority as a screening tool, the excessive radiation dose becomes a concern of MP-CCT. In this work, we propose a motion-compensated reconstruction method for MP-CCT with the limited angle acquisition for each phase in order to substantially reduce the radiation dose. MP-CCT of the XCAT phantom with eight cardiac phases was simulated with 90° coverage for each phase. The motion was estimated from images reconstructed by combining projections from two phases (for a full 180° coverage). To reconstruct the image at phase k, the motion fields were used to warp images at phase k to phase j (j = 1~8 and j ≠ k) so that all projection data could be used for a total variation (TV) constrained reconstruction. The results show that TV reconstruction for each cardiac phase independently (TV-Single Phase) suffered severe limited-angle artifacts. TV reconstruction with two-phase projections (TV-Two Phases) improved the image quality and was suitable for good motion estimation. Motion-compensated TV reconstruction (TV-MC) achieved almost artifact-free images, although some motion errors could be seen. The root mean square error values are 254 HU, 64 HU and 47 HU for TV-Single Phase, TV-Two Phases, and TV-MC, respectively.

Citation Download Citation

Mingwu Jin, Cong Zhao, Xun Jia, and Lifeng Yu "Motion-compensated reconstruction for limited-angle multiphase cardiac CT", Proc. SPIE 10573, Medical Imaging 2018: Physics of Medical Imaging, 1057333 (9 March 2018); https://doi.org/10.1117/12.2294922

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available