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目的:探讨使用快速成像技术行下肢动脉3D DCE-MRA检查的方法,从而为准确评估下肢动脉性病变提供依据。方法:回顾性分析临床怀疑下肢动脉狭窄或闭塞病变者13例,1次注射对比剂15 m L,行下肢动脉3D DCE-MRA检查。采用透视触发技术(care-bolus法)测试延迟时间,应用结合各种快速成像技术的小角度快速激发梯度回波序列,显示全下肢动脉包括腹主动脉下端、髂总动脉、髂外动脉、髂内动脉起始段、股动脉、腘动脉、胫前动脉、胫后动脉、腓动脉以及各侧支循环,图像质量分为优、良、差等级。结果:13例患者无检查失败者,下肢动脉血管显示清晰,静脉污染程度较轻,其中图像质量被评为优者占52.03%(115/221)、良占42.99%(95/221)、差占4.98%(11/221),1例左侧下肢动脉因患者不自主抖动而有运动伪影。结论:在3.0T MR上行结合各种快速成像技术的下肢动脉3D DCE-MRA检查,可以满足临床诊断下肢动脉疾病需求。
OBJECTIVE: To explore the method of 3D DCE-MRA in lower extremity arteries using rapid imaging technique to provide evidence for accurate assessment of lower extremity arterial disease. Methods: Thirteen patients with clinically suspected lower extremity arterial stenosis or occlusion were retrospectively analyzed. One contrast agent (15 m L) was injected into the lower extremity for 3D DCE-MRA. The delay time was measured by the care-bolus method. The small-angle, rapid-fire gradient echo sequence combined with various rapid imaging techniques showed that the lower extremity arteries included the inferior abdominal aorta, the common iliac artery, the external iliac artery, the iliac Arterial segment, femoral artery, popliteal artery, anterior tibial artery, posterior tibial artery, peroneal artery and the collateral circulation, the image quality is divided into excellent, good and bad grades. Results: In the 13 patients without examination failure, the lower extremity arterial blood vessels showed a clear degree of venous pollution, the image quality was rated as excellent (52.03% (115/221), good accounting for 42.99% (95/221), poor Accounting for 4.98% (11/221). One case of left lower extremity arteries had motion artifacts due to involuntary jitter in patients. Conclusion: The 3D DCE-MRA of lower extremity artery combined with various rapid imaging techniques in 3.0T MR can meet the need of clinical diagnosis of lower extremity arterial disease.