Reduction of Distortion Artifacts in Brain MRI Using a Field Map-based Correction Technique in Diffusion-weighted Imaging : A Prospective Study.

IF 2.8 3区 医学 Q2 Medicine
Clinical Neuroradiology Pub Date : 2024-03-01 Epub Date: 2023-08-28 DOI:10.1007/s00062-023-01338-3
Nils F Grauhan, Natascha Grünebach, Lavinia Brockstedt, Antoine Sanner, Thorsten Feiweier, Vanessa Schöffling, Marc A Brockmann, Ahmed E Othman
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引用次数: 0

Abstract

Purpose: The aim of this study was to evaluate the image quality and feasibility of a field map-based technique to correct for susceptibility-induced geometric distortions which are typical for diffusion EPI brain imaging.

Methods: We prospectively included 52 patients during clinical routine in this single-center study. All scans were performed on a 3T MRI. Patients' indications for MRI mainly consisted of suspected stroke due to the clinical presentation. For the morphological comparison of the corrected and uncorrected EPI diffusion, three experienced radiologists assessed the image quality of the sequences in a blinded and randomized fashion using a Likert scale (1 being poor; 5 being excellent). To ensure comparability of the two methods, an additional quantitative analysis of the apparent diffusion coefficient (ADC) was performed.

Results: Corrected EPI diffusion was rated significantly superior in all the selected categories: overall level of artifacts (p < 0.001), degree of distortion at the frontal, temporal, occipital and brainstem levels (p < 0.001), conspicuousness of ischemic lesions (p < 0.001), image quality (p < 0.001), naturality (p < 0.001), contrast (p < 0.001), and diagnostic confidence (p < 0.001).

Conclusion: Corrected EPI diffusion offers a significant reduction of geometric distortion in all evaluated brain regions and an improved conspicuousness of ischemic lesions. Image quality, overall artifacts, naturality, contrast and diagnostic confidence were also rated superior in comparison to uncorrected EPI diffusion.

Abstract Image

在弥散加权成像中使用基于场图的校正技术减少脑磁共振成像中的失真伪影:一项前瞻性研究。
目的:本研究旨在评估一种基于场图的技术的图像质量和可行性,该技术可纠正扩散 EPI 脑成像中典型的由感光度引起的几何失真:在这项单中心研究中,我们前瞻性地纳入了 52 名临床常规患者。所有扫描均在 3T 磁共振成像仪上进行。患者进行核磁共振成像的适应症主要是临床表现可疑中风。为了对校正和未校正 EPI 弥散进行形态学比较,三位经验丰富的放射科医生采用李克特量表(1 为差;5 为优)对序列的图像质量进行了盲法和随机评估。为确保两种方法的可比性,还对表观扩散系数(ADC)进行了额外的定量分析:结果:经校正的 EPI 扩散在所有选定类别中均被评为明显优越:伪影的总体水平(p 结论:经校正的 EPI 扩散提供了更高的图像质量:经校正的 EPI 弥散可显著减少所有评估脑区的几何失真,并改善缺血性病变的清晰度。图像质量、总体伪影、自然度、对比度和诊断信心也被评为优于未校正 EPI 扩散。
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来源期刊
Clinical Neuroradiology
Clinical Neuroradiology Medicine-Radiology, Nuclear Medicine and Imaging
CiteScore
4.90
自引率
3.60%
发文量
0
期刊介绍: Clinical Neuroradiology provides current information, original contributions, and reviews in the field of neuroradiology. An interdisciplinary approach is accomplished by diagnostic and therapeutic contributions related to associated subjects. The international coverage and relevance of the journal is underlined by its being the official journal of the German, Swiss, and Austrian Societies of Neuroradiology.
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