超高场 5T 系统下的足部相位对比磁共振血管造影:远端小静脉的可视化及温水浸泡的增强。

IF 4.2 1区 医学 Q1 CARDIAC & CARDIOVASCULAR SYSTEMS Journal of Cardiovascular Magnetic Resonance Pub Date : 2024-10-24 DOI:10.1016/j.jocmr.2024.101114
Zhang Shi, Hao Li, Xiyin Miao, Bei Wang, Dong Wang, He Wang, Mengsu Zeng
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引用次数: 0

摘要

背景:超高场强磁共振成像系统已被证实可改善颅内远端血管和分支的可视化,但其对外周血管的有效性尚未得到研究。我们的目的是评估在 5T 磁场强度下通过足部温水浸泡(WWI)进行三维相衬磁共振血管成像(3D PC-MRA)对下肢血管的可视化情况:方法:前瞻性地招募参与者,在进行和未进行温水浸泡(水温在 40 至 45 ℃ 之间,持续时间为 10 分钟)的情况下,对足部进行 3T 和 5T 三维 PC-MRA 检查。疑似下肢血管疾病患者接受了 CTA 检查,以确定病灶。通过信噪比(SNR)、主观评分、定量血管分割和流速来评估 WWI 前后的血管显像情况。采用弗里德曼检验确定统计学意义:在 30 名参与者(平均年龄 46.2±5.9;男性 20;下肢血管疾病 10)中,有 900 个血管片段可供评估。5T图像在图像质量和足部血管可视化方面的得分明显高于3T图像(均为P 结论:5T三维PC-MRA能有效显示下肢疾病患者的足部血管。此外,WWI 能显著增强对远端和小血管的描绘。
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Phase-contrast Magnetic Resonance Angiography of Foot at Ultra-high field 5T System: Visualization of Distal Small Vessels and Enhancement by Warm Water Immersion.

Background: Ultra-high field strength MR system has been proved to offer improved visualization of the distal intracranial vessels and branches, but its effectiveness on peripheral vasculatures was not investigated. We aim to assess the visualization of lower-extremity vessels using three-dimensional phase contrast MR angiography (3D PC-MRA) at 5T field-strength through the feet with warm water immersion (WWI).

Methods: Participants were prospectively recruited and underwent 3T, 5T 3D PC-MRA on feet with and without WWI (water temperature between 40 to 45 ℃ for a duration of 10minutes). Patients with suspected lower-extremity vessel diseases underwent CTA for lesion identification. Signal-to-noise ratio (SNR), subjective scoring, quantitative vessel segmentation and flow velocity were performed to assess vessel visualization before and after WWI. Friedman's test was conducted to determine statistical significance.

Results: Out of thirty participants (mean age, 46.2±5.9; males, 20; lower-extremity vessel disease, 10), 900 vessel segments were available for evaluation. 5T images showed significantly higher scores of image quality and foot vessel visualization than 3T (all P <.05). WWI further improved the visualizing scores (percentage of score 3: 40.2% vs 66.2%, P =.008), SNR (44.27 vs 67.78, P <.001), total branch count (151.92 ± 29.17 vs 225.63 ± 16.76; P <.001), and the flow velocity (0.72 ± 0.03 vs 0.48 ± 0.11cm/s; P <.001).

Conclusion: 3D PC-MRA at 5T effectively visualizes foot vessels in patients with lower-extremity disease. Furthermore, WWI can significantly enhance the depiction of distal and small vessels.

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来源期刊
CiteScore
10.90
自引率
12.50%
发文量
61
审稿时长
6-12 weeks
期刊介绍: Journal of Cardiovascular Magnetic Resonance (JCMR) publishes high-quality articles on all aspects of basic, translational and clinical research on the design, development, manufacture, and evaluation of cardiovascular magnetic resonance (CMR) methods applied to the cardiovascular system. Topical areas include, but are not limited to: New applications of magnetic resonance to improve the diagnostic strategies, risk stratification, characterization and management of diseases affecting the cardiovascular system. New methods to enhance or accelerate image acquisition and data analysis. Results of multicenter, or larger single-center studies that provide insight into the utility of CMR. Basic biological perceptions derived by CMR methods.
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