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目的探讨插入有限脉冲响应(IFIR)技术行肺动脉成像的可行性。方法对28例受试者行IFIR肺动脉成像序列扫描,在ADW 4.6工作站上行最大密度投影(MIP)重建。对肺动脉主干及其各分支显示程度进行评分,与肺动脉的信噪比、年龄、有无呼吸运动伪影等因素对比分析。结果 26例(92.9%)可显示肺动脉主干血管,24例(85.7%)能清晰观察到肺动脉主干及一、二级分支,20例(71.4%)可清晰显示到肺动脉主干及一、二、三、四级分支。呼吸运动影响肺动脉评分,有无呼吸伪影组评分平均秩次分别为58.25及36.42(P=0.005)。不同年龄组间血管评分不同,<70岁组及≥70岁组血管评分平均秩次为60.42及46.58(P=0.008)。信噪比与肺动脉评分无关(P=0.124)。结论磁共振IFIR非对比剂增强序列可清楚显示肺动脉主干及其各级分支,是一种具有很好临床应用前景的无创、安全、可行的肺动脉血管成像技术。
Objective To investigate the feasibility of inserting limited impulse response (IFIR) into pulmonary artery imaging. Methods Twenty-eight subjects underwent IFIR pulmonary angiography and scanned at the ADW 4.6 workstation for maximum density projection (MIP) reconstruction. The pulmonary artery trunk and its branches showed the degree of scoring, and pulmonary artery signal to noise ratio, age, with or without respiratory motion artifacts and other factors comparative analysis. Results Twenty-six patients (92.9%) showed the main pulmonary arteries and 24 (85.7%) of them could clearly observe the main pulmonary artery and the first and second branches. Twenty (71.4%) showed clearly the pulmonary artery trunk and one, two, , Four branches. Respiratory movement affected pulmonary artery score, with or without respiratory artifact scores were 58.25 and 36.42 (P = 0.005). Vascular score was different between different age groups. The mean rank of vascular score was 60.42 and 46.58 (P = 0.008) in <70 years old and ≥70 years old. Signal-to-noise ratio was not related to pulmonary artery score (P = 0.124). Conclusions Magnetic resonance imaging (IFIR) non-contrast enhancement sequence can clearly show the main pulmonary artery and branches at all levels. It is a noninvasive, safe and feasible pulmonary artery imaging technique with good clinical application.