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Validation of cine phase-contrast MR imaging for motion analysis

✍ Scribed by Anila Lingamneni; Peter A. Hardy; Kimerly A. Powell; Norbert J. Pelc; Richard D. White

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
844 KB
Volume
5
Category
Article
ISSN
1053-1807

No coin nor oath required. For personal study only.

✦ Synopsis

The accuracy of cine phasecontrast magnetic resonance (MR) imaging for motion analysis was evaluated. By using a rotating phantom and postproceseing algorithm for phase tracking, errors d i n g during data acquisition were identifled and compensation methods were developed. A spatially varying background phase offset in the velocity images was found to be due to eddy current-induced fields. The magnitude of the offset was in the range of 0-20 cmlsec, which is of the same order of magnitude as cardiac contractile velocities. Background offset is thus an important source of error in tracking cardiac motion. Study of dffferent tracking algorithms revealed the need for an integration scheme using motion terms higher than velocity. Also, considerable improvement in the accuracy and stability of the predicted trajectories was obtained by averaging the trajectories proceeding both forward and backward in time from the starting point. With the algorithm developed, the motion of the phantom was tracked through a complete rotation of the phantom to an accuracy of 2 pixels. Index term.: Clne studles * Heart. funcUon. 51.12144 -Heart. MR. 5 I . I2144 * Image processlng * MoUon studles * Phase correctlon * Phase lmaglng -Veloclty studles

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