Feasibility of Noncontrast 3D MR Angiography on a Commercial Wide-Bore 0.55-T System: Comparison with 1.5-T MR Angiography.

IF 3.8 Q1 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Nikita C Nair, Matthew S Tong, Katarzyna E Gil, Ning Jin, Yuchi Han, Orlando P Simonetti, Juliet Varghese
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Abstract

Purpose To evaluate a noncontrast electrocardiographically triggered, navigator-gated, three-dimensional, balanced steady-state free precession MR angiography (MRA) research sequence on a wide-bore 0.55-T commercial low-field-strength system, by comparing image quality and aortic dimension measurements against images obtained at 1.5 T. Materials and Methods Ten healthy volunteers (28.8 years ± 9.0 [SD]; four male) and 10 participants being evaluated for dilated thoracic aorta (53.6 years ± 10.7; six male) underwent noncontrast MRA scans at both 1.5 T and 0.55 T. Overall image quality, intrarater and interrater agreement in aortic dimensions, and diagnostic accuracy were evaluated between field strengths for both groups of individuals using Wilcoxon test, intraclass correlation coefficient, and Bland-Altman plots. Results Median image quality scores remained comparable between volunteers and participants across field strengths. Blood signal variability was greater at the ascending aorta at 1.5 T for volunteers (P = .01) and participants (P = .02). Blood-myocardium contrast was significantly higher at the ascending aorta and proximal arch at 1.5 T for volunteers and participants (P < .05). Excellent intra- and interrater agreement (intraclass correlation coefficient > 0.9) was demonstrated at 0.55 T and 1.5 T. Aortic dimensions (intraclass correlation coefficient > 0.9) and diagnosis of aortic dilatation did not demonstrate significant interfield differences. Conclusion Noncontrast, three-dimensional, balanced steady-state free precession MRA at 0.55 T demonstrated adequate image quality and no significant differences in quantitative measurements or diagnostic accuracy compared with 1.5 T. Keywords: Noncontrast MR Angiography, Low Field, 0.55 T, Obesity, Thoracic Aorta © RSNA, 2025.

商用宽口径0.55-T系统上非对比3D MR血管成像的可行性:与1.5-T MR血管成像的比较。
目的通过将图像质量和主动脉尺寸测量值与1.5 t时获得的图像进行比较,评价在宽口径0.55 t商用低场强系统上的无对比心电图触发、导航门控、三维、平衡稳态自由进动磁共振血管造影(MRA)研究序列。4名男性)和10名参与者被评估为胸主动脉扩张(53.6岁±10.7岁;使用Wilcoxon检验、类内相关系数和Bland-Altman图,对两组患者进行了1.5 T和0.55 T的非对比磁共振成像扫描,评估了整体图像质量、主动脉尺寸的门内和门间一致性和诊断准确性。结果中位数图像质量得分在志愿者和参与者之间保持可比性。在1.5 T时,志愿者(P = 0.01)和参与者(P = 0.02)升主动脉的血液信号变异性更大。在1.5 T时,志愿者和参与者的升主动脉和近弓处血-心肌对比明显升高(P < 0.05)。在0.55 T和1.5 T时,主动脉尺寸(类内相关系数> 0.9)和主动脉扩张的诊断没有明显的域间差异。结论0.55 T下的无对比、三维、平衡稳态自由进动MRA具有足够的图像质量,与1.5 T相比,定量测量和诊断准确性无显著差异。关键词:无对比MR血管造影、低场、0.55 T、肥胖、胸主动脉©RSNA, 2025。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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