Central intraluminal saturation stripe on MR angiograms of curved vessels: simulation, phantom, and clinical analysis.
Central intraluminal saturation stripe on MR angiograms of curved vessels: simulation, phantom, and clinical analysis.
复制标题
弯曲血管 MR 血管造影上的中央管腔内饱和条纹：模拟、模型和临床分析。
DOI：
10.1148/radiology.198.3.8628862
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Berger,SA
中科院分区：
文献类型：
--
作者：
Saloner,D;vanTyen,R;Dillon,WP;Jou,LD;Berger,SA
目的 研究磁共振 (MR) 血管造影中血管中心信号强度降低的现象，以模拟腔内血栓。材料和方法进行模拟和模型研究来分析明显曲线远端的 MR 血管造影表现。结果相对于血管周边的信号强度，饱和效应显着降低了血管中心的信号强度。即使流动是有序且层流的，这些效应也会出现。在弯曲的几何形状中，二次流模式产生反向旋转的涡流，将移动最快的颗粒移动到曲线的外侧，并将移动缓慢的颗粒折叠到血管的中心。结论降低饱和度的成像参数选择，例如采集横向于血管并穿过可疑区域的二维截面，可以有效消除体内中心低信号效应。
PURPOSETo investigate the appearance of reduced signal intensity in the center of blood vessels on magnetic resonance (MR) angiograms that can mimic intraluminal thrombus.MATERIALS AND METHODSSimulations and phantom studies were performed to analyze MR angiogram appearance distal to a pronounced curve.RESULTSSaturation effects substantially lower the signal strength in the center of the vessel relative to that at the vessel periphery. These effects appeared even though the flow was well ordered and laminar. In curved geometries, secondary flow patterns produced counter-rotating vortices, which moved the fastest-moving particles to the outside of the curve and folded the slow-moving particles to the center of the vessel.CONCLUSIONImaging parameter choices that reduce saturation, such as acquisition of a two-dimensional section transverse to the vessel and through the questionable region, effectively eliminate the central hypointensity effect in vivo.