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首页> 外文期刊>Journal of magnetic resonance >Non-Cartesian sampled centric scan SPRITE imaging with magnetic field gradient and B_0(t) field measurements for MRI in the vicinity of metal structures
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Non-Cartesian sampled centric scan SPRITE imaging with magnetic field gradient and B_0(t) field measurements for MRI in the vicinity of metal structures

机译：具有磁场梯度和B_0（t）场测量的非笛卡尔采样中心扫描SPRITE成像，用于在金属结构附近进行MRI

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This paper proposes the possibility of spatially resolved MRI measurements undertaken inside metallic cells. MRI has been rarely usable inside conducting vessels due to the eddy currents in the walls caused by switching magnetic field gradients, which render most advanced MRI pulse sequences impossible. We propose magnetic field gradient waveform monitoring (MFGM) for MRI of samples inside metallic cells. In this work the MFGM method was extended to measure the B_0 field temporal evolution associated with gradient waveforms. MFGM was used to observe and correct eddy current effects associated with a metallic cell. High quality centric scan SPRITE images result from such corrections. MRI of samples held under pressure, most notably rock core samples, traditionally employs cells that are non-magnetic and fabricated from polymeric materials. The natural material for high-pressure MRI is however non-ferromagnetic metal given their high tensile strengths and high thermal conductivity. MRI measurement of macroscopic samples at high pressure would be generally possible if metallic pressure vessels could be employed. This study will form the basis of new MRI compatible metallic pressure vessels, which will permit MRI of macroscopic systems at high pressure.
机译：本文提出了在金属细胞内部进行空间分辨MRI测量的可能性。由于切换磁场梯度会在壁中产生涡流，因此在传导血管内部很少使用MRI，这使得不可能使用最先进的MRI脉冲序列。我们提出磁场梯度波形监测（MFGM）用于金属细胞内部样品的MRI。在这项工作中，MFGM方法被扩展为测量与梯度波形相关的B_0场的时间演化。 MFGM用于观察和纠正与金属电池相关的涡流效应。此类校正可产生高质量的中心扫描SPRITE图像。 MRI在压力下保持的样品（最主要是岩心样品）传统上采用非磁性的单元并由聚合材料制成。高压MRI的天然材料是非铁磁性金属，因为它们具有高拉伸强度和高导热性。如果可以使用金属压力容器，通常可以在高压下对宏观样品进行MRI测量。这项研究将成为新的MRI兼容金属压力容器的基础，它将允许在高压下对宏观系统进行MRI。

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