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A B-spline approach to phase unwrapping in tagged cardiac MRI for motion tracking

Authors

  • Patricia Chiang,

    1. School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
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  • Yiyu Cai,

    1. School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
    2. Institute for Media Innovation, Nanyang Technological University, Singapore, Singapore
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  • Koon Hou Mak,

    1. School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
    2. Mak Heart Clinic, Gleneagles Medical Center, Singapore, Singapore
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  • Jianmin Zheng

    Corresponding author
    1. School of Computer Engineering, Nanyang Technological University, Singapore, Singapore. This work is in part supported by the ARC 9/09 Grant (MOE2008-T2-1-075) of Singapore
    • School of Computer Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
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Abstract

A novel B-Spline based approach to phase unwrapping in tagged magnetic resonance images is proposed for cardiac motion tracking. A bicubic B-spline surface is used to model the absolute phase. The phase unwrapping problem is formulated as a mixed integer optimization problem that minimizes the sum of the difference between the spatial gradients of absolute and wrapped phases, and the difference between the rewrapped and wrapped phases. In contrast to the existing techniques for motion tracking, the proposed approach can overcome the limitation of interframe half-tag displacement and increase the robustness of motion tracking. The article further presents a hybrid harmonic phase imaging-B-spline method to take the advantage of the harmonic phase imaging method for small motion and the efficiency of the B-Spline approach for large motion. The proposed approach has been successively applied to a full set of cardiac MRI scans in both long and short axis slices with superior performance when compared with the harmonic phase imaging and quality guided path-following methods. Magn Reson Med, 2013. © 2012 Wiley Periodicals, Inc.

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