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使用3D相敏反转恢复技术同时采集高对比度和定量肝脏T图像:一项可行性研究。

Simultaneous acquisition of high-contrast and quantitative liver T images using 3D phase-sensitive inversion recovery: a feasibility study.

作者信息

Fujiwara Yasuhiro, Maruyama Hirotoshi, Kosaka Nobuyuki, Ishimori Yoshiyuki

机构信息

1 Department of Medical Imaging, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan.

2 Radiological Center, National Hospital Organization Kumamoto Medical Center, Kumamoto, Japan.

出版信息

Acta Radiol. 2017 Aug;58(8):899-905. doi: 10.1177/0284185116678273. Epub 2016 Nov 21.

Abstract

Background Tumor-to-liver contrast is low in images of chronically diseased livers because gadolinium-based hepatocyte-specific contrast agents (Gd-EOB-DTPA) accumulate less to hepatocytes. Purpose To determine whether phase-sensitive inversion recovery (PSIR) could improve the T contrasts of Gd-based contrast agents and liver parenchyma and simultaneously provide accurate T values for abdominal organs. Material and Methods The image contrasts of phantoms with different Gd concentrations that were obtained using PSIR were compared to conventional turbo field echo (TFE) results. T value was estimated using PSIR by performing iterations to investigate the two IR magnetization evolutions. The estimated T values were validated using IR-spin echo (IR-SE) and Look-Locker (L-L) sequences. In an in vivo study, the liver-to-spleen and liver-to-muscle contrasts of the PSIR and TFE images of seven volunteers were compared, as were the T values of liver parenchyma, spleen, and muscle obtained using PSIR and L-L sequences. Results The PSIR images showed T contrasts higher than those in the TFE results. The PSIR and IR-SE T values were linearly correlated. Additionally, the R estimated using PSIR were correlated with those measured using IR-SE and L-L. In the in vivo study, the liver-to-spleen and liver-to-muscle contrasts of PSIR were significantly higher than those obtained using TFE. T values of abdominal organs obtained using PSIR and L-L were clearly correlated. Conclusion PSIR may be capable of improving liver image T contrasts when Gd-based contrast agents are employed and simultaneously yielding accurate T values of abdominal organs.

摘要

背景

在慢性肝病的图像中,肿瘤与肝脏的对比度较低,因为基于钆的肝细胞特异性造影剂(Gd-EOB-DTPA)在肝细胞中的积聚较少。目的:确定相位敏感反转恢复(PSIR)是否可以改善基于钆的造影剂与肝实质的T对比度,并同时为腹部器官提供准确的T值。材料与方法:将使用PSIR获得的不同钆浓度体模的图像对比度与传统的快速场回波(TFE)结果进行比较。通过执行迭代来研究两次IR磁化演变,使用PSIR估计T值。使用IR自旋回波(IR-SE)和Look-Locker(L-L)序列验证估计的T值。在一项体内研究中,比较了7名志愿者的PSIR和TFE图像的肝脾对比度和肝肌对比度,以及使用PSIR和L-L序列获得的肝实质、脾脏和肌肉的T值。结果:PSIR图像显示的T对比度高于TFE结果中的对比度。PSIR和IR-SE的T值呈线性相关。此外,使用PSIR估计的R与使用IR-SE和L-L测量的R相关。在体内研究中,PSIR的肝脾对比度和肝肌对比度明显高于使用TFE获得的对比度。使用PSIR和L-L获得的腹部器官T值明显相关。结论:当使用基于钆的造影剂时,PSIR可能能够改善肝脏图像的T对比度,并同时产生腹部器官的准确T值。

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