下肢二维TOF法磁共振血流成像

Two-Dimensional Time-of-Flight MR Angiography of the Lower Extremity Arteries

本文目的是确定二维ＴＯＦ法磁共振血流成像对下肢周围血管性疾病诊断的准确性和可靠性。１５例患者１３２段血管用二维ＴＯＦ法磁共振血流成像检查，其中６例患者４９段血管同时进行了常规血管造影检查。在１３２段血管中，ＭＲＡ检查显示正常血管１０２段，异常血管３０段。在３０段异常血管中，轻度狭窄９段，明显狭窄１１段，完全闭塞８段，动脉瘤２段。在同时进行ＭＲＡ和常规血管造影检查的４９段血管中，正常血管３５段，异常血管１４段。二者显示一致４７段，仅２段显示有差异，其中１段是由于动脉内Ｓｔｒｅｃｋｅｒ支架置入引起ＭＲＡ信号丢失，考虑血管闭塞，而血管造影显示血管明显狭窄。另一段ＭＲＡ显示一侧髂总动脉轻度狭窄，而血管造影正常。我们的研究结果证明ＭＲＡ对下肢周围血管性疾病，特别是闭塞性血管疾病有较高准确性和可靠性。如能适当应用扫描序列和参数，将使其能达到常规血管造影对周围血管性疾病诊断的精确性。

To identify the accuracy and reliability of magnetic resonance angiography (MRA) in evaluating patients with lower peripheral vascular disease. Two-dimensional time-of-flight (2D TOF) MRA was used to evaluate 132 arterial segments in patients. Of which, 49 segments in six patients were studied with conventional arteriography. MRA findings were compared with that of the angiography. In 132 segments, MRA showed normal in 102 comfirmed by angiographies in all 35 undergoing arteriographies, and abnormal in 30 (mild stenosis in nine. significant stenosis in 11, occlusions in eight, and aneurysms in two) identified by angiographies in 14. In the 49 segments e valuated by both MRA and angiography, a good correlation between these two imaging modalities was found in 47 of the 49 segments, and a poor correlation in two because of loss of blood flow on the MR angiogram after implantation of a Strecker stent in one, of technical limitation in another one. 2D TOF MRA is accurate and reliable in evaluating the patency of the lower extremity arteries.