The value of DTI and SWI sequence in diagnosis of diffuse axonal injury / 实用放射学杂志

Objective To assess the value of diffusion tensor imaging(DTI)and susceptibility weighted imaging(SWI)in diagno-sis of acute diffuse axonal injury.Methods The imaging data of 45 cases with acute DAI diagnosed by clinical symptoms were ana-lyzed retrospectively.In all the images of T2 WI,FLAIR ,DTI and SWI we analyzed the characteristic of signal and distribution of all the lesions.The numbers of lesions found in each sequence group were statistically analyzed by chi-square test.Results 497 lesions of DAI we all found.265 lesions were found in FLAIR,the detection rate was 53.3%.313 lesions in DTI,the rate was 62.9%.448 lesions in SWI,the rate was 90.1%.The detection rate of DTI and SWI were significantly higher than FLAIR,they had significant difference(P <0.05).Conclusion DTI combined with SWI,we can find DAI lesions in acute phase more comprehensively.DTI di-mensional diffusion tensor imaging technique can help us visualize discontinuous fibers intuitively in DAI and confirm objectively the existence of DAI lesions.

A comparative study of using the CTP imaging to evaluation the hemodynamic changes before and after clipping of intracranial aneurysm / 实用放射学杂志

Objective To explore the change of cerebral microcirculation before and after clipping of intracranial aneurysm using CT perfusion (CTP)imaging.Methods CTP images of 70 patients diagnosed intracranial aneurysm by CTA were retrospectively an-alysed.They were divided into four groups according to have or not intracranial arterial spasm:A group:Preoperative CVS,postop-erative CVS (4 cases),B group:Preoperative CVS,postoperative nCVS (13 cases),C group:Preoperative nCVS,postoperative CVS (20 cases),D group:Preoperative nCVS,postoperative nCVS (33 cases).CBV/CBF/MTT were measured in four groups be-fore and after surgery,and analyzed statistically.Results (1)The postoperative CBV/CBF/MTT was compared with the preopera-tive data.There were statistically significant in CBVA/B/C/D/CBFA/B/D/MTTA/B during the surgery (P 0.05).(2)There were statistically significant in the△CBVBC/BD/△CBFAB/BC/BD/△MTTAB/BD (P 0.05).Conclusion CTP can early and accurately predict the change of cerebral microcircu-lation after surgery.