目的 本研究旨在评估和比较 心血管磁共振术(MRI)和计算机断层扫 描血管造影(CTA)在经导管主动脉瓣置 换术(TAVR)前对于主动脉瓣环的直径测 量。方法 20例主动脉瓣狭窄患者(平均 年龄(81.8±5.4)岁)在TAVR术前接受了 MRI和CTA。采用MRI和MRA在舒张中期测 量了主动脉瓣面积。采用4分评分量表来 评估MR图像质量和主动脉瓣钙化程度。 结果 平均检测时间为(14±4.2)min。图 像质量均值为(3.1±0.9)。平均钙化程 度相似。根据Bland-Altman分析， MRA 和CTA对于主动脉瓣面积的测量无明显差 异 [平均差异-3.1mm2 (-44.4 mm2 ，38.2 mm2 )]。结论 采用MRI对主动脉瓣面积和 钙化的评估准确可靠，适用于有造影剂 肾病风险的患者人群。

Objective This study was designed to assess and compare the diameter of the aortic valve annulus before the transcatheter aortic valve replacement (TAVR) before the non-contrast cardiovascular magnetic resonance (MRI) and computed tomography angiography (CTA) measuring. Methods A total of 20 patients with aortic stenosis (mean age (81.8±5.4) years) underwent MRI and CTA prior to TAVR. The aortic valve area was measured by MRI and MRA in the diastolic mid. The 4-point scale was used to assess MR image quality and aortic valve calcification. Results The average detection time was (14±4.2)min. The image quality is (3.1±0.9). The average degree of calcification is similar. According to Bland-Altman analysis, MRA and CTA had no significant difference in the measurement of aortic valve area [mean difference - 3.1 mm2 (-44.4 mm2 , 38.2 mm2 )]. Conclusion The evaluation of aortic valve area and calcification by MRI is accurate and reliable, and it is suitable for the patients with the risk of contrast nephropathy.