Abstract: ［Abstract］ Objective〖HTSS〗〓To discuss the value of MR T2trufi bright blood sequence and contrastenhanced magnetic resonance pulmonary angiography（MRPA） in the diagnosis of pulmonary artery embolism.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓Thirty healthy adult Chinese white rabbit were chosen as experimental animal and were examined using computer tomography pulmonary angiography(CTPA)、 MRPA and MR T2trufi bright blood sequence separately. Their pulmonary arteries were graded by vessel diameter. The basic values such as vessel diameter, vessel edge and density in each grade of pulmonary artery were compared with each other and with the results of pulmonary artery embolism.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓①In the display of vessel diameters, MRPA and CTPA, MR T2trufi bright blood sequence had no significant difference in the display of gradeⅠpulmonary artery(P＞005); MR T2trufi bright blood sequence detected a larger diameter than MRPA and CTPA in gradeⅡpulmonary artery(P＜005); MRPA had a larger diameter than CTPA and MR T2trufi bright blood sequence in Ⅲ and Ⅳpulmonary artery(P＜005). ②In the display of vessel clarity, CTPA was superior than MR T2trufi bright blood sequence and MRPA in gradeⅠpulmonary artery(P＜005); CTPA was superior than MR T2trufi bright blood sequence and MRPA in gradeⅡpulmonary artery, and MRPA was the worst(P＜005); In grade Ⅲ and Ⅳpulmonary artery, CTPA was superior than MR T2trufi bright blood sequence(P＜005), and MRPA had no significant difference with MR T2trufi bright blood sequence(P＞005). ③In the detection of pulmonary emboli, CTPA and MR T2trufi bright blood sequence had significant difference in gradeⅡpulmonary artery(P＜005); CTPA and MR T2trufi bright blood sequence , MRPA had significant difference in grade Ⅲ pulmonary artery(P＜005).
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓MR T2trufi bright blood sequence and MRPA pulmonary artery angiography had obvious advantage in the diagnosis of pulmonary artery embolism, but the examination time and signalnoise ratio are inevitable pitfalls. MR can not replace CTPA examination up till now, but can be an beneficial supplement.

Key words: pulmonary embolism, magnetic resonance imaging, pulmonary artery angiography