Meeting Banner
Abstract #1159

Prospective Navigator Cardiac Triggering for Coronary MRA

Naoyuki Takei1, Yuji Iwadate1, Takayuki Suzuki2, Koji Yoneyama2, Takayuki Masui2, Hiroyuki Kabasawa1

1Global Applied Science Laboratory, GE Healthcare, Hino, Tokyo, Japan; 2Radiology, Seirei Hamamatsu General Hospital, Japan

The purpose of this study was to develop a prospective navigator echo based cardiac triggering for coronary artery imaging (CAI). Echo peak from FID signal acquired using 2D selective navigator pulse with 10mm in diameter that was placed on aortic arch was used for cardiac triggering. The magnitude of echo peak from the FID was displayed on a real-time monitor window. Systole was detected by a rise in echo peak above a threshold. Data was acquired with Balanced Steady State Free Precession (bSSFP) data acquisition with spectral selective inversion pulse for fat saturation (SPIR) with breath hold. The comparison study was performed to a conventional ECG trigger approach on 1.5T. The preliminary results provide a comparable depiction of coronary arteries to ECG without the constraints of scan time, spatial resolution and image quality.

Keywords

abnormality accurate acquisition adapt additionally advance aortic applications applied approaches approved arch arteries artery axial axis balanced began bipolar blue board body breath cardiac channel channels cine coil combined comparable compensate connections consistently constraints coronary delay delayed depiction derive described detect detected detecting determined diameter diastole difficult displayed echoes efficient electrocardiogram encoding every examination extended fetal flow fluctuations free gated general generally global gradient gradients handing healthy heart hold hospital inflow institutional intervals inversion japan laboratory leads limitations long magnetization magnitude make materials matrix monitor motion navigator need orientation overcome parallel patient peak peaks perfusion placed placement placing positions precession preliminary prevents proposed prospective pulse pulses quality radiology readout real receiver recovery reduce related repeated representative requires resolution review rise saturation science selected selection selective short slab slice spatial spectral steady subject successfully sufficient suitable synchronization systole systolic threshold tracker trigger triggered triggering typical velocity visualized volunteer waveform whole wireless yellow