Department of Radiology, University of Utah, 30 North 1900 East #1A071, Salt Lake City, UT 84132, USA.
United States Navy, Bethesda, MD, USA.
Neuroradiology. 2013 Aug;55(8):941-945. doi: 10.1007/s00234-013-1194-1. Epub 2013 May 5.
Our objective is to determine the utility of noncontrast Hounsfield unit values, Hounsfield unit values corrected for the patient's hematocrit, and venoarterial Hounsfield unit difference measurements in the identification of intracranial venous thrombosis on noncontrast head computed tomography.
We retrospectively reviewed noncontrast head computed tomography exams performed in both normal patients and those with cerebral venous thrombosis, acquiring Hounsfield unit values in normal and thrombosed cerebral venous structures. Also, we acquired Hounsfield unit values in the internal carotid artery for comparison to thrombosed and nonthrombosed venous structures and compared the venous Hounsfield unit values to the patient's hematocrit.
A significant difference is identified between Hounsfield unit values in thrombosed and nonthrombosed venous structures. Applying Hounsfield unit threshold values of greater than 65, a Hounsfield unit to hematocrit ratio of greater than 1.7, and venoarterial difference values greater than 15 alone and in combination, the majority of cases of venous thrombosis are identifiable on noncontrast head computed tomography.
Absolute Hounsfield unit values, Hounsfield unit to hematocrit ratios, and venoarterial Hounsfield unit value differences are a useful adjunct in noncontrast head computed tomographic evaluation of cerebral venous thrombosis.
我们的目的是确定非对比亨氏单位值、校正患者红细胞压积的亨氏单位值以及动静脉亨氏单位差值测量在非对比头部 CT 中识别颅内静脉血栓形成的应用价值。
我们回顾性地分析了正常患者和脑静脉血栓形成患者的非对比头部 CT 检查，获取正常和血栓形成的脑静脉结构中的亨氏单位值。此外，我们还获取了颈内动脉的亨氏单位值，以便与血栓形成和非血栓形成的静脉结构进行比较，并将静脉亨氏单位值与患者的红细胞压积进行比较。
在血栓形成和非血栓形成的静脉结构之间，亨氏单位值存在显著差异。应用大于 65 的亨氏单位阈值值、大于 1.7 的亨氏单位与红细胞压积比值以及大于 15 的动静脉差值值单独和联合应用时，大多数静脉血栓形成病例可在非对比头部 CT 上识别。
绝对亨氏单位值、亨氏单位与红细胞压积比值以及动静脉亨氏单位差值是在非对比头部 CT 评估脑静脉血栓形成时有用的辅助手段。
