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首页> 外文期刊>European Journal of Radiology Open >Feasibility of aortic valve planimetry at 7?T ultrahigh field MRI: Comparison to aortic valve MRI at 3?T and 1.5?T
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Feasibility of aortic valve planimetry at 7?T ultrahigh field MRI: Comparison to aortic valve MRI at 3?T and 1.5?T

机译：在7？T超高场MRI下进行主动脉瓣平面测量的可行性：与在3？T和1.5？T下进行的主动脉瓣MRI比较

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IntroductionThis study examined the feasibility of aortic valve planimetry at 7?T ultrahigh field MRI in intraindividual comparison to 3?T and 1.5?T MRI.Material and methodsAortic valves of eleven healthy volunteers (mean age, 26.4 years) were examined on a 7?T, 3?T, and 1.5?T MR system using FLASH and TrueFISP sequences. Two experienced radiologists evaluated overall image quality, the presence of artefacts, tissue contrast ratios, identifiability, and image details of the aortic valve opening area (AVOA). Furthermore, AVOA was quantified twice by reader 1 and once by reader 2. Correlation analysis between artefact severity and employed magnetic field strength was performed by modified Fisher’s exact-test. Pairedt-test was used to analyse for AVOA differences, and Bland-Altman plots were used to analyse AVOA intra-rater and inter-rater variability.ResultsAortic valve imaging at 7?T, 3?T, and 1.5?T with using FLASH was less hampered by artefacts than TrueFISP imaging at 3?T and 1.5?T. Tissue contrast and image details were rated best at 7?T. AVOA was measured slightly smaller at 7?T compared to 3?T (TrueFISP, p-value?=?0.057; FLASH, p-value?=?0.016) and 1.5?T (TrueFISP, p-value?=?0.029; FLASH, p-value?=?0.018). Intra-rater and inter-rater variability of AVOA tended to be slightly smaller at 7?T than at 3?T and 1.5?T.ConclusionAortic valve planimetry at 7?T ultrahigh field MRI is technically feasible and in healthy volunteers offers an improved tissue contrast and a slightly better reproducibility than MR planimetry at 1.5?T and 3?T.
机译：前言本研究探讨了在7？T超高场MRI与3？T和1.5？T MRI进行个体内比较时主动脉瓣平面测量的可行性。材料和方法在11例健康志愿者（平均年龄26.4岁）上检查了11名健康志愿者的主动脉瓣膜。使用FLASH和TrueFISP序列的T，3？T和1.5？T MR系统。两名经验丰富的放射科医生评估了总体图像质量，伪像的存在，组织对比度，可识别性以及主动脉瓣开口面积（AVOA）的图像细节。此外，通过阅读器1对AVOA进行了两次定量分析，通过阅读器2对AVOA进行了定量分析。人工伪造的严重程度与所用磁场强度之间的相关性分析通过改良的Fisher精确检验进行。使用成对检验分析AVOA差异，使用Bland-Altman图分析AVOA评分内和评分间变异性。结果使用FLASH对主动脉瓣在7？T，3？T和1.5？T处进行成像与在3？T和1.5？T的TrueFISP成像相比，受伪影的干扰更少。组织对比度和图像细节的最佳评分为7？T。在7？T时测得的AVOA略小于3？T（TrueFISP，p值== 0.057; FLASH，p-值α=？0.016）和1.5？T（TrueFISP，p值？= 0.029;闪存，p值== 0.018）。在7？T时，AVOA的评分者内和评分者间差异往往比3？T和1.5？T时略小。结论7？T超高场MRI的主动脉瓣平面测量在技术上是可行的，并且在健康志愿者中提供了改善的组织在1.5？T和3？T时，其对比度和重现性比MR平面仪稍好。

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