期刊
MAGNETIC RESONANCE IN MEDICINE
卷 75, 期 4, 页码 1594-1604出版社
WILEY-BLACKWELL
DOI: 10.1002/mrm.25761
关键词
coronary MRI; iterative self-navigation; free-breathing
资金
- Swiss National Science Foundation (SNF) [320030_143923]
Purpose: In respiratory self-navigated coronary MRA, the selection of a reference position may have a direct effect on image quality. While end-expiration is commonly used as reference, it may be ill defined in cases of irregular breathing. Here, an iterative self-navigation approach that operates without a reference position was implemented and tested in healthy volunteers and patients. Methods: Data were acquired in 15 healthy volunteers and in 23 patients. Images obtained with end-expiratory self-navigation were compared with those obtained with the iterative approach that incorporates cross-correlation to iteratively minimize a global measure of respiratory displacement. Vessel sharpness, length, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) were evaluated while differences in breathing patterns between the two sub-groups were assessed, too. Results: Vessel sharpness and length were similar for both methods in healthy volunteers. In patients, a significant improvement in vessel sharpness and length was obtained using the iterative approach. SNR and CNR remained constant. While end-expiration was the most frequent respiratory phase in healthy volunteers (57.6 +/- 16.2%), intermediate respiratory phases (43.4 +/- 30.1%) were predominantly found in patients. Conclusion: An iterative approach to respiratory motion correction in self-navigation may lead to significant improvements in coronary MRA image quality in patients with a less consistent end-expiratory respiratory phase. (C) 2015 Wiley Periodicals, Inc.
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