Evaluation of susceptibility weighted imaging in defining penumbra during acute stage of cerebral infarction and comparison with perfusion weighted imaging / 中华神经科杂志

ABSTRACT

Objective To evaluate whether susceptibility weighted imaging (SWI) can be used in definition of penumbra during acute stage of cerebral infarction,compared with perfusion weighted imaging (PWI).Methods Ischemic stroke patients within 3 days after onset were included.They adopted multimodal magnetic resonance imaging examination,including regular magnetic resonance imaging sequence (T1 WI,T2 WI and T2-weight fast fluid-attenuated inversion-recovery),diffusion weighted imaging (DWI),PWI and SWI.Alberta Stroke Programme Early CT Score was done on DWI,SWI and PWI.The mismatch of SWI-DWI (minimal indensity projection (mIP)-DWI) was compared with that of PWI-DWI (mean transit time (MTT)-DWI) and analyzed statistically.The application of prominent vein (PV) on SWI as a sort of alternation of cerebral blood volume (CBV) and direct observation of thrombosis in arteries on SWI were done.Results The SWI-DWI (2.39 ± 1.42) and the MTT-DWI (2.72 ± 1.49) mismatch showed no statistically significant difference (r =0.726,P ＞ 0.05).The grade of PV was positively related with the CBV of the ipsilateral brain tissue on admission (r =0.564,P ＜ 0.05).SWI showed the similar ability with magnetic resonance angiography to judge responsible blood vessels with susceptibility vessel sign.Conclusion SWI-DWI can evaluate the ischemic penumbra.PV may reflect the increased blood volume of the lesion side of the brain tissue.SWI can reveal the thrombosis of the responsible vessels.