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Coronary artery imaging in a 0.5-Tesla scanner: implementation of real-time, navigator echo-controlled segmented k-space FLASH and interleaved-spiral sequences.

Keegan, J; Gatehouse, PD; Taylor, AM; Yang, GZ; Jhooti, P; Firmin, DN; (1999) Coronary artery imaging in a 0.5-Tesla scanner: implementation of real-time, navigator echo-controlled segmented k-space FLASH and interleaved-spiral sequences. Magn Reson Med , 41 (2) pp. 392-399.

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Abstract

Coronary angiography techniques have been implemented on a 0.5-Tesla scanner with a view to performing coronary artery imaging. Slice-followed, segmented k-space FLASH sequences and interleaved-spiral sequences have been employed with acquisitions under real-time navigator echo control with patient feed back, enabling poor signal-to-noise levels to be overcome by averaging data acquired over multiple, variable-length, reproducible breath holds. Good-quality, millimetre-resolution coronary images were obtained in ten normal subjects with both techniques. The mean percent of data segments or interleaves acquired with the navigator echo within the 5-mm diaphragm acceptance window was 57% [standard deviation (S.D.), 11%; range, 38-85%], and the average image-acquisition times were 123+/-22 sec and 71+/-14 sec for segmented FLASH and interleaved-spiral imaging, respectively. In addition to shorter acquisition times, the interleaved-spiral sequence has superior temporal resolution, allowing the acquisition of limited, multislice data sets. However, the sequence is particularly sensitive to the off-resonance effects of residual epicardial fat surrounding the artery and to field nonuniformities, both of which lead to image blurring and, unlike segmented FLASH acquisitions (which are very robust), the spiral data sets generally require postprocessing.

Type: Article
Title: Coronary artery imaging in a 0.5-Tesla scanner: implementation of real-time, navigator echo-controlled segmented k-space FLASH and interleaved-spiral sequences.
Location: United States
Keywords: Adult, Coronary Vessels, Humans, Magnetic Resonance Angiography, Respiration
UCL classification: UCL > School of Life and Medical Sciences
UCL > School of Life and Medical Sciences > Faculty of Population Health Sciences > Institute of Cardiovascular Science
URI: http://discovery.ucl.ac.uk/id/eprint/137849
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