Abstract 13220: The Efficiency of 1.5T Non-Contrast Single Breath Hold Whole Heart MR Coronary Angiography by 32-Channel Cardiac Coil
Background: Non-contrast 1.5T whole heart MR coronary angiography (WH-MRCA) has a potential as ultimate non-invasive screening method for coronary artery disease (CAD). However, WH-MRCA scan needs long time under breath holding and conventional scan is usually performed under respiratory gating. Recently developed 32-channel cardiac coil can reduce scan time to half and single breath hold (SBH) WH-MRCA can finish within 30 seconds, approximately. We prospectively evaluated an availability of SBH WH-MRCA using this coil.
Method: We successively performed SBH and free breath (FB) WH-MRCA in 72 new patients (38 males, 34 females, 58.9±12.5 y.o.). Scan time was recorded and two independent investigators scored image quality (4: fine, 3: good, 2: acceptable, 1: poor). We defined case that main coronary artery segment (AHA segment RCA#1-3, LMT#5, LAD#6-7 and LCx#11,13) is well-visualized as success. We compared images of SBH WH-MRCA with FB WH-MRCA.
Result: Scan time of SBH was 31.6±5.3 seconds and significantly shorter than FB (270.3±131.8 seconds; p<0.001). Image quality score of main RCA, LMT, LAD and LCx didn't significantly changed (3.6±0.6, 3.6±0.6, 3.3±0.7 and 2.9±0.8 of SBH, vs. 3.7±0.5, 3.7±0.5, 3.5±0.6 and 3.0±0.9; n.s.). Successful rate was also equivalent in the two methods (94.4% vs. 97.2%; n.s.). In 2 cases of poor respiratory synchronization, FB failed, but SBH succeeded for scan of coronary artery.
Conclusion: SBH WH-MRCA by 32ch-cardiac coil can dramatically reduce scan time with maintenance of main coronary artery visualization. SBH can contribute performance of MRCA even in cases of poor respiratory synchronization. In conclusion, this method can recognize an availability of convenient screening method for CAD.
- © 2011 by American Heart Association, Inc.