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目的：介绍造影剂注入法三维肺血管MRA（3D－MRPA）技术在诊断肺癌浸润肺动脉上的应用经验，初步认识此项技术的临床价值。材料和方法：肺癌4例。Cd－DTPA0．2mmol／kg静注后，应用高性能MR扫描系统，闭气下摄取24层肺血管SPGR序列连续冠状断面像，用时27秒。再重复同样扫描，分别获得肺动脉期相与支气管动脉期相。最后，以最大强度投影法（MIP）制成3D－MRPA。结果：4例肺癌显示出3种MRPA表现：肺动脉受累、可疑肺动脉受累与肺动脉无受累。可疑肺动脉受累，病例手术证实为粘连，MRPA的原始图像显示肿瘤与血管相切密切，血管内腔通畅，但管壁轻微受压变形。结论：造影法三维MRPA可以评价肿瘤浸润肺动脉。
OBJECTIVE: To introduce the application experience of 3D-MRPA in the diagnosis of infiltrating pulmonary arteries in patients with lung cancer with contrast agent injection, and to initially understand the clinical value of this technique. Materials and Methods: 4 patients with lung cancer. After intravenous injection of Cd-DTPA 0.2mmol/kg, a high-performance MR scanning system was used to take a continuous coronal cross-sectional image of 24 layers of pulmonary blood vessel SPGR sequences in a closed manner, taking 27 seconds. The same scan was repeated again to obtain the pulmonary artery phase and the bronchial artery phase, respectively. Finally, the 3D-MRPA is made by Maximum Intensity Projection (MIP). Results: Four lung cancers showed three types of MRPA: pulmonary artery involvement, pulmonary artery involvement, and pulmonary artery involvement. Suspected pulmonary artery involvement was confirmed by adhesion in case of surgery. The original MRPA image showed that the tumor was closely related to the blood vessel and the lumen of the blood vessel was open, but the vessel wall was slightly compressed and deformed. Conclusion: Three-dimensional MRPA with angiography can evaluate tumor invasion in pulmonary artery.