磁共振基础知识和三T磁共振.ppt

TOF (inflow) MRA at (a) 1.5 T and (b) 3.0 T in the same individual 1.5 T 3.0 T 28/6.9; 50 sections; time, 2 minutes 34 seconds; section thickness, 2 mm; field of view, 160 x 160 ; matrix, 336 x 212; voxel size, 0.92 mm3 26/3.5; 100 sections time, 7 minutes 57 seconds section thickness, 1 mm field of view, 250 x 250 mm2 matrix, 832 x 571 voxel size, 0.13 mm3 TOF MR angiograms at (a) 1.5 T and (b) 3.0 T in a patient with high-grade stenosis of the right internal carotid artery 1.5 T 3.0 T 扫描参数分别同上一图像 MIPs from 3D TOF MR angiography in a 58-year-old woman show moyamoya vessels (arrows) from ICAs Transverse　 MIP 3.0-T 1.5-T lateral MIP of the right side 3.0-T 1.5-T show moyamoya vessels (arrows) from ICAs lateral MIP of the left side 3.0-T 1.5-T show moyamoya vessels (arrows) from ICAs MR Angiography 3.0-T TOF MRA的高空间分辨率及广解剖覆盖范围，较小的脑供血动脉病变的检查成为可能。 几乎与DSA相似的空间分辨率，以致有人乐观地预言其可大部分替代DSA检查。 这方面的临床研究有待深入。 61-year-old male patient with dysarthria 3T 3D TOF-MRA a segmental high-grade stenosis at the cavernous segment of the distal ICA DSA lateral view almost identical features of stenosis at the corresponding location A 70-year-old female patient with involuntary movement of the left side. 3T 3D TOF-MRA flow void in the proximal portion of the right middle cerebral artery DSA anteroposterior view a focal high-degree stenosis at the corresponding location A 69-year-old male patient with dizziness 3T 3D TOF-MRA a focal high-grade stenosis at the proximal portion of the basilar trunk. DSA oblique view a focal high-grade stenosis at the corresponding location MR Angiography Time resolved three-dimensional contrast-enhanced MRA：4D MRA four-dimensional time-resolved angiography using keyhole (4D-TRAK) DSA findings early arterial early venous phase a patient with large frontal arteriovenous malformation four-dimensional time-resolved angiography using keyhole (4D-TRAK) DSA f