磁敏感加权成像在诊断脑微出血中的应用

目的 探讨SWI在诊断脑微出血(CMBs)中的应用价值。方法 回顾性分析15例CMBs患者共257个病灶的影像学资料,观察病灶信号、大小、位置,并分析不同类型图像检出CMBs病灶的差异。结果 257个CMBs病灶中均匀信号病灶165个,混杂信号病灶92个;最大径1.4~8.4 mm,混杂信号病灶最大径明显大于均匀信号病灶(P<0.01);混杂信号主要分布于幕上,少见于幕下。SWI、幅度(Mag)、相位(Phase)及最小密度投影(mIP)图像检出的CMBs病灶总数差异无统计学意义(P>0.05)。Phase图像混杂信号占比明显高于SWI及Mag图像(P均<0.01),mIP图像明显低于SWI及Mag图像(P均<0.01)。结论 CMBs影像表现多样,并受病灶大小和位置影响。SWI可作为诊断CMBs的有效检查方法。

Application of susceptibility weighted imaging in diagnosis of brain microbleeds

Objective To investigate the application value of SWI in diagnosing cerebral micro-bleeds (CMBs). Methods Image data of 15 CMBs patients with 257 lesions were retrospectively analyzed. The signal, size, position of focus were studied and the differences of detection rate obtained with different types of images were compared. Results Homogeneous signals were found in 165 lesions, while heterogeneous signals were found in 92 lesions. The maximum diameter ranged 1.4 from 8.4 mm. The diameters of heterogeneous signal lesions were longer than those of homogeneous signal lesions (P<0.01). Heterogeneous signal lesions were mainly distributed in supratentorial area and rarely found in infratentorial area. There was no statistical differences of CMBs lesions detected with SWI, magnitude (Mag), phase (Phase) and minimum intensity projection (mIP) images (P>0.05). The proportion of heterogeneous signals in Phase images was higher than that in SWI and Mag images (both P<0.01), as well as the proportion in mIP image was lower than that in SWI and Mag images (both P<0.01), respectively. Conclusion The imaging appearances of CMBs are variable and influenced by size and position. SWI is an effective method for diagnosis of CMBs.