ObjectiveTo explore the efficacy of multi-detector CT pulmonary angiography(MDCTPA) in the diagnosis of pulmonary embolism. MethodsA total of 82 patients with pulmonary embolism diagnosed by MDCT were selected. The display of pulmonary arteries and their embolus were assessed after MDCT pulmonary angiography image edited by multi-planar reconstruction, volume reconstruction and maximum density projection. The direct and indirect signs of pulmonary embolism in MDCTPA were summarized. Results①In 82 patients with pulmonary embolism, multi-detector CT scan revealed that 405 pulmonary arteries or branches were involved, including 16 pulmonary segmental arteries,81 lobar arteries,128 pulmonary trunk，15 left/right pulmonary arteries and 165 sub-segmental-arteries or the branches.② MDCTPA direct signs of pulmonary embolism included mural thrombus (n=40), completely blocked filling defect(n=15), central filling defect (n=9) and eccentric filling defect(n=18).③ MDCTPA indirect signs of pulmonary embolism included sparse and small lung texture (n=12) pulmonary patchy exudation or consolidation(n=22), pulmonary hypertension (n=28), pericardial or pleural effusion (n=17) and pulmonary infarction (n=3). ConclusionThe application of MDCTPA to the diagnosis of pulmonary embolism is simple, quick, noninvasive and accurate. It can directly display the position and shape of the embolus and the stenosis degree of the lumen, and can provide a reference for the early diagnosis and evaluation of the efficacy.

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