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Updated: Jun 1, 2025

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基于2ppm的化学交换和转移信号进行的大脑温度映射

Siqi Cai1, Chongxue Bie1, Yang Zhou1

  • 1Paul. C. Lauterbur Research Centers for Biomedical Imaging, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.

Quantitative imaging in medicine and surgery
|January 22, 2025
PubMed
概括

这项研究展示了一种新的方法来绘制大脑温度,使用肌酸的化学交换和转移 (CEST) 效应. 这种技术为高分辨率的体内温度测量提供了一个有希望的,无标签的方法.

关键词:
温度映射测绘 温度映射测绘大脑大脑大脑的大脑大脑化学交换和转移 (CEST) 是一种创造蛋白 (Cr) 是一种

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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
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The position of the absorption signal of a sample is reported relative to the position of the signal of tetramethylsilane (TMS), which is added as an internal reference while recording spectra. The difference between the absorption frequencies of the sample and TMS (in Hz) is divided by the spectrometer operating frequency (in MHz) to obtain a dimensionless quantity called the chemical shift. It is reported on the δ (delta) scale and expressed in parts per million.
For instance, the proton...
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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