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Proceedings Paper

Improved cardiac wall motion tracking based on harmonic phase technique
Author(s): Diaa El-Deen M. Yosry; Abou-Bakr M. Youssef; Mohamed Saad El-Sherif; Yasser M. Kadah
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Paper Abstract

The problem of detecting and tracking SPAMM tags has been the focus of cardiac MRI in the past few years. Among the many methods proposed to do that, the harmonic phase method (called HARP) has a large potential to enable real-time tracking. We propose two improvements to the original HARP technique to address the problem of magnetic field inhomogeneity and improve tracking. We derive a theoretical model for the problem of field inhomogeneity and propose an extension of the simulated phase evolution rewinding technique (SPHERE) whereby consecutive images are acquired using alternating echo time. Then, we propose a simple and computationally efficient approach that allows the problems of disappearing tag lines to be addressed. In particular, the geodesic horizontal and vertical distances between neighboring corner points in the detected tag lines are computed for each image. Once the correspondence between tag lines is established, the tracking of any point on the wall can be obtained given its relationship to the four corner points surrounding its location. The proposed improvements were implemented and applied to numerical phantoms as well as experimental data obtained for the original HARP technique to demonstrate the potential of the new techniques.

Paper Details

Date Published: 24 April 2002
PDF: 11 pages
Proc. SPIE 4683, Medical Imaging 2002: Physiology and Function from Multidimensional Images, (24 April 2002); doi: 10.1117/12.463576
Show Author Affiliations
Diaa El-Deen M. Yosry, Cairo Univ. and Electronics Research Institute (Egypt)
Abou-Bakr M. Youssef, Cairo Univ. (Egypt)
Mohamed Saad El-Sherif, Electronics Research Institute (Egypt)
Yasser M. Kadah, Cairo Univ. (Egypt)

Published in SPIE Proceedings Vol. 4683:
Medical Imaging 2002: Physiology and Function from Multidimensional Images
Anne V. Clough; Chin-Tu Chen, Editor(s)

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