流空效应(flowing void effect):心血管内的血液由于流动迅速,使发射MR信号的氢原子核离开接受范围,而此时成像层面内原部位的质子为新流入的非激发质子,所以测不到MR信号,在T1加权像或T2加权像中均呈黑影,即流空效应,这一效应使心腔和血管显影。
参考文献
[1]Torashima, Miyuki, et al. “The value of detection of flow voids between the uterus and the leiomyoma with MRI.” Journal of Magnetic Resonance Imaging 8.2 (1998): 427-431.