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ObjectiveTo evaluate the clinical and imaging features and infarct pattern in patients with middle cerebral artery(MCA) stenosis and occlusion,to clarify its infarct pathogenesis. Methods35 MCA moderate and severe stenosis or occlusion patients diagnosed by TCD were studied;the clinical and imaging features and infarct pattern were retrospectively analyzed. Results( 1 ) Clinical features :The clinical manifestations of 35 patients was hemiplegia symptoms,in which 16 cases(45.7％ ) involved to the face,upper and lower limb,11 cases(31.4％ ) involved to the upper and lower limb,3 cases(8.6％ ) involved to the facial and upper limb,2 cases(5.7％ ) involved only to the facial,2 cases(5.7％ ) involved to the facial and upper limb,1 cases(2.9％ ) involved only to the upper limb. (2) MRA imaging characteristics and infarct pattern: 29 cases ( 82.9％ ) of patients with stenosis or occlusion showed moderate severe stenosis,6 cases( 17.1％ ) showed MCA occlusion. 30 cases( 85.7％ ) showed ischemic infarction,in which perforating artery infarction was the most common infarct pattern of middle cerebral artery stenosis or occlusive patients( 53.3％ ) ,followed by water-shed infarct ( 26. 7) ％, pial infarct was ielatively small (20. 0％ ). ConclusionThe hemiplegia was the most common clinical symptoms in patients with MCA stenosis and occlusion, and mainly involves to the face,upper and lower limb;The perforating artery infarction was the most common infarct pattern,and its infarct mechanism was an artery-to-artery embolism or hemodynamic abnormalities.
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0.05).Results No side effect was recorded.100% of images were with excellent quality.Conclusion Patients with previous endovascular stent surgery can receive 1.5T high field MRI examination safely.Usually the examination can be performed in 4~8 weeks after the surgery,but in special case,earlier examination is also acceptable.
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Objective To evaluate usefulness of high-resolution MRI in quantitative analysis of femoral micro-structure.Methods This study included 110 cases which were divided into 4 groups according to the results of DXA.High-resolution MRI of left hip joint wasperformed on a 1.5T super-conductive MR scanner.3 ROIs were selected on the largest oblique-coronal images of femur to gain thebinary images derived from software processing and 30 parameters were analyzed.Results The parameters to be of statistical significance were 77% and 67%,respectively.Full points of structural parameters with significant difference were 6,4~6 points were 60% and 2~3 points were 40%.Trabecula connective parameters such as trabecula area,mean framework length and mean trabecula perimeter had positive correlation with bone density,r=0.547～0.722,0.58～0.654 and 0.573～0.688,P