1、腦靜脈竇血栓之診斷概要,福建醫(yī)科大學(xué)附屬第一醫(yī)院影像科鄭 賢 應(yīng),Causes of and Predisposing Factors for Cerebral Venous Thrombosis,Clinical Features of Cerebral Venous Thrombosis,Acute stage (0–5 days),In the acute stage of thrombus formation

2、, the signal is predominantly isointense on T1WI and hypointense on T2WI because of deoxyhemoglobin in red blood cells trapped in the thrombus,Subacute stage (6–15 days),In the subacute stage of thrombus development， the

3、 signal is predominantly hyperintense on both T1WI and T2WI because of methemoglobin in the thrombus,Chronic stage (>15-day-old),the signal in a chronic thrombus is typically isointense or hyperintense on T2WI and is

4、ointense on T1WISinus enhancement is presumably secondary to an organized thrombus with intrinsic vascularization as well as to slow flow in dural and intrathrombus collateral channels,主要CT征象,正常靜脈竇CT值,？,正常顱腦組織CT值,腦灰質(zhì)C

5、T值34-39Hu腦白質(zhì)CT值26-29Hu靜脈竇CT值40-60Hu,直接征像,？,束帶征（索條征）,,高密度三角征,,直竇及大腦大靜脈血栓,深靜脈血栓: 基底靜脈及直竇密度增高,高密度血栓占25%,？,雙側(cè)橫竇及右側(cè)乙狀竇血栓,？,右側(cè)橫竇血栓 充盈缺損,Empty delta sign,？,Pseudo empty delta sign,Arachnoid granulations,間接征像,靜脈性梗死、水腫、靜脈性出