A dual-projection respiratory self-gating technique for whole-heart coronary MRA

✍ Scribed by Peng Lai; Andrew C. Larson; Xiaoming Bi; Renate Jerecic; Debiao Li

• Book ID: 102905009
• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 532 KB
• Volume: 28
• Category: Article
• ISSN: 1053-1807
• DOI: 10.1002/jmri.21479

✦ Synopsis

Abstract

Purpose

To investigate the accuracy of a dual‐projection respiratory self‐gating (DP‐RSG) technique in dynamic heart position measurement and its feasibility for free‐breathing whole‐heart coronary MR angiography (MRA).

Materials and Methods

A DP‐RSG method is proposed to enable accurate direct measurement of heart position by acquiring two whole‐heart projections. On 14 volunteers we quantitatively evaluated the efficacy of DP‐RSG by comparison with diaphragmatic navigator (NAV) and single‐projection‐based respiratory self‐gating (SP‐RSG) methods. For DP‐RSG we also compared center‐of‐mass and two profile‐matching algorithms in deriving heart motion. Coronary imaging was conducted on eight volunteers based on retrospective gating to preliminarily validate the effectiveness of DP‐RSG for whole‐heart coronary MRA. Comparison of vessel delineation was performed between images reconstructed using different gating methods.

Results

The quantitative evaluation shows that DP‐RSG more accurately tracks heart motion than NAV with all gating window (GW) values and SP‐RSG approaches with GW ≥2.5 mm and profile‐matching algorithms are more reliable for motion derivation than center‐of‐mass calculations with GW ≥1.0 mm. Whole‐heart coronary MRA studies demonstrate the feasibility of using DP‐RSG to improve overall delineation of the coronary arteries.

Conclusion

DP‐RSG is a promising approach to better resolve respiratory motion for whole‐heart coronary MRA compared to conventional NAV and SP‐RSG. J. Magn. Reson. Imaging 2008;28:612–620. © 2008 Wiley‐Liss, Inc.