目的前瞻性比较研究以0.1mmol/kg团注钆贝葡胺(Gd-BOPTA)和钆喷葡胺(Gd-DTPA)两种对比剂进行MR增强血管成像获得的盆腔、股部及除足以外下肢的可疑或已知周围动脉闭塞病 Objective prospective comparative study with 0.1 mmol / kg group injection of gadopenterexglucosamine (Gd-BOPTA) and gadopentetate dimeglumine (Gd-DTPA) two contrast agents for MR enhanced angiography pelvic, femoral and foot enough to outside Suspected or known peripheral arterial occlusive disease in lower limbs