金属材料对磁共振成像均匀性的影响:定量实验研究。

IF 1.6 3区 医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE
Hiroaki Shimamoto, Doaa Felemban, Yuka Uchimoto, Nobuhiko Matsuda, Naoko Takagawa, Ami Takeshita, Yuri Iwamoto, Ryoko Okahata, Tomomi Tsujimoto, Sven Kreiborg, Sanjay M Mallya, Fan-Pei Gloria Yang
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引用次数: 0

摘要

目的:采用标准化方法定量评估金属材料对磁共振成像均匀性的影响:采用标准化方法定量评估金属材料对磁共振成像均匀性的影响:方法:将六种类型的 1 厘米立方体金属材料(即金、银、铝、金银钯合金、钛和钴铬合金)嵌入填充的玻璃模型中进行检查,并与未插入金属材料的情况进行比较。使用配有 8 通道相控阵脑线圈和头颈线圈的 1.5 T MR 超导磁体扫描仪,在每种条件下对人体模型进行了五次扫描。每次检查都使用符合美国材料与试验协会(ASTM)F2119-07 标准的 T1 加权自旋回波(SE)和梯度回波(GRE)序列在三个平面上扫描模型:轴向、冠状和矢状面。图像均匀性采用非均匀性指数(NUI)进行评估,该指数由美国国家电气制造商协会(NEMA)制定,是研究磁场均匀性的适当标准化指标:结果:使用钴铬合金的 T1-GRE 图像通常引起最低的均匀性,其次是使用钛的 T1-GRE 图像,而所有其他金属材料都不会影响图像的均匀性。特别是,与不含金属材料的图像的测量不确定性相比,含 Co-Cr 的 T1-GRE 图像显示的 NUI 值明显更高,最大可达 6.6 厘米,相当于以其为中心的 11 张切片:我们发现,当存在 Co-Cr 和 Ti 时,磁共振图像的均匀性受到扫描序列和线圈类型的影响。据推测,Co-Cr 和 Ti 的图像不均匀是由它们的高磁感引起的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of metallic materials on magnetic resonance image uniformity: a quantitative experimental study.

Objective: To assess quantitatively the effect of metallic materials on MR image uniformity using a standardized method.

Methods: Six types of 1 cm cubic metallic materials (i.e., Au, Ag, Al, Au-Ag-Pd alloy, Ti, and Co-Cr alloy) embedded in a glass phantom filled were examined and compared with no metal condition inserted as a reference. The phantom was scanned five times under each condition using a 1.5-T MR superconducting magnet scanner with an 8-channel phased-array brain coil and head and neck coil. For each examination, the phantom was scanned in three planes: axial, coronal, and sagittal using T1-weighted spin echo (SE) and gradient echo (GRE) sequences in accordance with the American Society for Testing and Materials (ASTM) F2119-07 standard. Image uniformity was assessed using the non-uniformity index (NUI), which was developed by the National Electrical Manufacturers Association (NEMA), as an appropriate standardized measure for investigating magnetic field uniformity.

Results: T1-GRE images with Co-Cr typically elicited the lowest uniformity, followed by T1-GRE images with Ti, while all other metallic materials did not affect image uniformity. In particular, T1-GRE images with Co-Cr showed significantly higher NUI values as far as 6.6 cm at maximum equivalent to 11 slices centering around it in comparison with the measurement uncertainty from images without metallic materials.

Conclusion: We found that MR image uniformity was influenced by the scanning sequence and coil type when Co-Cr and Ti were present. It is assumed that the image non-uniformity in Co-Cr and Ti is caused by their high magnetic susceptibility.

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来源期刊
Oral Radiology
Oral Radiology DENTISTRY, ORAL SURGERY & MEDICINE-
CiteScore
4.20
自引率
13.60%
发文量
87
审稿时长
>12 weeks
期刊介绍: As the official English-language journal of the Japanese Society for Oral and Maxillofacial Radiology and the Asian Academy of Oral and Maxillofacial Radiology, Oral Radiology is intended to be a forum for international collaboration in head and neck diagnostic imaging and all related fields. Oral Radiology features cutting-edge research papers, review articles, case reports, and technical notes from both the clinical and experimental fields. As membership in the Society is not a prerequisite, contributions are welcome from researchers and clinicians worldwide.
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