摘要
目的通过与数字减影血管造影(DSA)的对照,确定64层螺旋CT血管造影(CTA)在诊断下肢动脉病变中的价值。方法选择行下肢动脉64层螺旋CTA及DSA检查的患者24例,DSA与64层螺旋CTA检查间隔时间<2周。CT重建采用最大密度投影、容积重建及多平面重建技术。DSA采用步进跟踪造影技术,分段DSA进行下肢血管检查,将64层螺旋CTA与DSA结果进行比较。结果 DSA显示34条共170段下肢动脉,69段血管存在狭窄性病变,CTA诊断血管高估8段,低估8段。以DSA检出血管狭窄程度≥50%为阈值,64层螺旋CTA对下肢动脉狭窄程度诊断的敏感性97.1%,特异性96.0%,准确率97.2%,阳性预测值94.4%,阴性预测值97.9%。结论 64层螺旋CTA是下肢动脉闭塞性病变评估的可靠方法,对下肢动脉硬化闭塞性病变的术前评估、诊断和筛选有较大的帮助,可为制订介入治疗方案提供可靠依据。
Objective To compare CT angiography（CTA）performed on 64-slices spiral CT scanner with digital subtraction angiography（DSA）and to determine the clinical value of CTA in diagnosis of lower extermity arterial diseases. Methods Findings on CTA and DSA of 24 patients with low- er extremity arterial occlusive diseases were retrospectively compared by two experienced radiolo- gists. The interval between CTA and DSA was within two weeks. CTA images were reconstructed with maximum intensity projection and volume render on working-station. DSA served as the reference standard for comparison with CTA in terms of diagonstic quality, grading of steno-occlu- sive lesions and visualization of collaterals. Results In 24 patients, there were 170 arterial seg- ments examined with both CTA and DSA, of which, 69 with stenosis on CTA conformed with DSA in demonstrating stenosis degree and extent. On CTA, 8 segmental stenosis were overestima- ted and 8 segmental stenosis were underestimated. Using detected segment stenosis degree higher than 50 % on DSA as threshold, the sensitivity, specificity, accuracy, positive predictive value, and negtive predictive value of CTA were 97. 1%, 96.0 %, 97.2 %, 94.4 % and 97.9 %, respectively. Conclusion 64-slices spiral CTA is an effective and reliable method for evaluating the lower ex- tremity arterial occlusive diseases and can provide precious information for planning interventional therapy.
出处
《中华老年心脑血管病杂志》
CAS
北大核心
2010年第5期412-415,共4页
Chinese Journal of Geriatric Heart,Brain and Vessel Diseases
关键词
下肢
血管疾病
体层摄影术
螺旋计算机
血管造影术
数字减影
lower extremity
vascular diseases ； tomography, spiral computed ； angiography, digital subtraction
