McConnell M V, Khasgiwala V C, Savord B J, Chen M H, Chuang M L, Edelman R R, Manning W J
Department of Medicine, Cardiovascular Division, Beth Israel Hospital, Boston, Massachusetts 02215, USA.
Magn Reson Med. 1997 Jan;37(1):148-52. doi: 10.1002/mrm.1910370121.
Current MR coronary angiography (MRCA) methods use breath-holding to minimize respiratory motion. A major limitation to this technique is misregistration between imaging slices due to breath-hold variability. Prospective adaptive correction of image location using real-time navigator measurement of diaphragm position is a potential method for improving slice registration in breath-hold MRCA. Ten subjects underwent MRCA using an ECG-gated, fat-suppressed, segmented k-space, gradient-echo sequence. Transverse and coronal images were acquired using standard breath-holding with and without prospective navigator correction. Breath-hold MRCA with prospective navigator correction resulted in a 47% reduction in craniocaudal slice registration error compared to standard breath-holding (0.9 +/- 0.2 mm versus 1.7 +/- 0.4 mm, P = 0.04). Prospective adaptive navigator correction of image location significantly improves slice registration for breath-hold MRCA and is a promising motion correction technique for cardiac MR.
当前的磁共振冠状动脉造影（MRCA）方法采用屏气来尽量减少呼吸运动。该技术的一个主要局限是由于屏气的可变性导致成像切片之间的配准错误。使用膈肌位置的实时导航器测量进行图像位置的前瞻性自适应校正，是一种改善屏气MRCA中切片配准的潜在方法。10名受试者采用心电图门控、脂肪抑制、分段k空间、梯度回波序列进行MRCA。使用标准屏气并在前瞻性导航器校正存在和不存在的情况下采集横向和冠状图像。与标准屏气相比，具有前瞻性导航器校正的屏气MRCA导致颅尾切片配准误差降低了47%（0.9±0.2毫米对1.7±0.4毫米，P = 0.04）。图像位置的前瞻性自适应导航器校正显著改善了屏气MRCA的切片配准，并且是一种有前景的心脏磁共振运动校正技术。
