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3.0T 下造影剂和外容积饱和带对肝脏单容积质子磁共振波谱水抑制和匀场的影响

Effects of contrast agent and outer volume saturation bands on water suppression and shimming of hepatic single-volume proton MR spectroscopy at 3.0T.

作者信息

Xu Li, Huang Yan, Liu Xian, Liu Bo

机构信息

Department of Radiology, Guangdong Provincial Traditional Chinese Medicine Hospital and Postdoctoral Mobile Research Station of Guangzhou University of Traditional Chinese Medicine, 111 Da De Lu, Guangdong, Guangzhou 510120, China.

出版信息

ScientificWorldJournal. 2012;2012:804698. doi: 10.1100/2012/804698. Epub 2012 Nov 20.

DOI:10.1100/2012/804698
PMID:23213299
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC3508555/
Abstract

PURPOSE

To determine whether administration of gadolinium diethylenetriamine pentaacetic acid (Gd-DTPA) and whether placement of the outer volume saturation bands significantly affect shimming and water suppression on hepatic MR spectroscopic prescanning.

METHOD

Region of interest (ROI) of 2 cm × 2 cm × 2 cm was carefully positioned in the region of the middle portion of the right hepatic lobe. 32 patients were examined before and after administration of Gd-DTPA with and without outer-volume saturation bands. Linewidths (Full-Width Half-Maximum (FWHM)) and water suppression were obtained. A paired t-test for comparison of means was used.

RESULTS

(1) The group with the outer volume saturation bands demonstrated slightly better water suppression effect than the group without outer volume saturation bands before administration. (2) The group with the outer volume saturation bands demonstrated better water suppression effect than the group without outer volume saturation bands after administration. (3) Both shimming and water suppression effects were decreased on enhanced MR spectroscopic prescanning (all P < 0.05).

CONCLUSIONS

Placement of the outer volume saturation bands is helpful to improve water suppression both before and after contrast agent administration. Gd-DTPA exerts a slightly adverse effect (a statistically significant but clinically unimportant) on magnetic resonance spectroscopic prescanning at 3T.

摘要

目的

确定给予钆喷酸葡胺（Gd-DTPA）以及设置外容积饱和带来是否会显著影响肝脏磁共振波谱预扫描时的匀场和水抑制。

方法

将2 cm×2 cm×2 cm的感兴趣区（ROI）小心置于右肝叶中部区域。32例患者在给予Gd-DTPA前后，分别在设置和未设置外容积饱和带的情况下进行检查。获取线宽（半高全宽（FWHM））和水抑制情况。采用配对t检验比较均值。

结果

（1）设置外容积饱和带的组在给药前的水抑制效果略优于未设置外容积饱和带的组。（2）设置外容积饱和带的组在给药后的水抑制效果优于未设置外容积饱和带的组。（3）增强磁共振波谱预扫描时匀场和水抑制效果均降低（所有P<0.05）。

结论

设置外容积饱和带有助于在给予对比剂前后改善水抑制。Gd-DTPA在3T时对磁共振波谱预扫描有轻微不良影响（具有统计学意义但临床不重要）。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4401/3508555/75a3051d8e4e/TSWJ2012-804698.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4401/3508555/c3cd7ae1a43f/TSWJ2012-804698.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4401/3508555/bf80bb46dbf2/TSWJ2012-804698.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4401/3508555/75a3051d8e4e/TSWJ2012-804698.003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4401/3508555/c3cd7ae1a43f/TSWJ2012-804698.001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4401/3508555/bf80bb46dbf2/TSWJ2012-804698.002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4401/3508555/75a3051d8e4e/TSWJ2012-804698.003.jpg

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