为配备高性能梯度线圈的 3 特斯拉和 7 特斯拉磁共振成像系统使用球形网格模型进行非线性梯度场绘图。

IF 2.5 3区 医学 Q2 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Magnetic Resonance in Medical Sciences Pub Date : 2024-10-01 Epub Date: 2023-09-09 DOI:10.2463/mrms.tn.2023-0063
Ryoichi Kose, Katsumi Kose, Koji Fujimoto, Tomohisa Okada, Daiki Tamada, Utaroh Motosugi
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引用次数: 0

摘要

最近制造的高性能梯度线圈主要以牺牲空间线性为代价。在这项研究中,我们测量了两个配备高性能梯度线圈的磁共振成像系统的梯度线圈所产生磁场的空间非线性。我们使用三维梯度回波序列和内置晶格结构的球形模型测量了梯度场的非线性。梯度场的空间变化近似于三阶多项式。多项式系数采用最陡下降法计算。获得的三维磁共振图像的几何失真使用多项式进行了校正,并与使用磁共振成像供应商提供的谐函数校正的三维图像进行了比较。结果发现,供应商提供的非线性校正公式不够充分,需要使用本研究中使用的几何模型进行验证或校正。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nonlinear Gradient Field Mapping Using a Spherical Grid Phantom for 3 and 7 Tesla MR Imaging Systems Equipped with High-performance Gradient Coils.

Recent high-performance gradient coils are fabricated mainly at the expense of spatial linearity. In this study, we measured the spatial nonlinearity of the magnetic field generated by the gradient coils of two MRI systems with high-performance gradient coils. The nonlinearity of the gradient fields was measured using 3D gradient echo sequences and a spherical phantom with a built-in lattice structure. The spatial variation of the gradient field was approximated to the 3rd order polynomials. The coefficients of the polynomials were calculated using the steepest descent method. The geometric distortion of the acquired 3D MR images was corrected using the polynomials and compared with the 3D images corrected using the harmonic functions provided by the MRI venders. As a result, it was found that the nonlinearity correction formulae provided by the vendors were insufficient and needed to be verified or corrected using a geometric phantom such as used in this study.

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来源期刊
Magnetic Resonance in Medical Sciences
Magnetic Resonance in Medical Sciences RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING-
CiteScore
5.80
自引率
20.00%
发文量
71
审稿时长
>12 weeks
期刊介绍: Magnetic Resonance in Medical Sciences (MRMS or Magn Reson Med Sci) is an international journal pursuing the publication of original articles contributing to the progress of magnetic resonance in the field of biomedical sciences including technical developments and clinical applications. MRMS is an official journal of the Japanese Society for Magnetic Resonance in Medicine (JSMRM).
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