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肝脏T2加权磁共振成像的图像质量与局灶性病变检测:两种高分辨率自由呼吸成像技术与两种屏气成像技术的比较

Image quality and focal lesion detection on T2-weighted MR imaging of the liver: comparison of two high-resolution free-breathing imaging techniques with two breath-hold imaging techniques.

作者信息

Lee Seung Soo, Byun Jae Ho, Hong Hye-Suk, Park Seong Ho, Won Hyung Jin, Shin Yong Moon, Lee Moon-Gyu

机构信息

Department of Radiology and Research Institute of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.

出版信息

J Magn Reson Imaging. 2007 Aug;26(2):323-30. doi: 10.1002/jmri.21002.

Abstract

PURPOSE

To evaluate image quality and accuracy for the detection of focal hepatic lesions depicted on T2-weighted images obtained with two high-resolution free-breathing techniques (navigator-triggered turbo spin-echo [TSE] and respiratory-triggered TSE) and two standard-resolution breath-hold techniques (breath-hold TSE with restore pulse and half-Fourier acquisition single-shot TSE [HASTE]).

MATERIALS AND METHODS

Our institutional review board approved this study, and written informed consent was obtained from all patients. Two readers independently reviewed 200 T2-weighted imaging sets obtained with four sequences in 50 patients. Both readers identified all focal lesions in session 1 and only solid lesions in session 2. The readers' confidence was graded using a scale of 1-4 (1 <or= 50%; 4 >or= 95%). The diagnostic accuracies of the four MR sequences were evaluated using the free-response receiver operating characteristic (ROC) method. Region-of-interest (ROI) measurements were performed for the mean signal intensity (SI) in the liver, spleen, hepatic lesions, and background noise.

RESULTS

The accuracy of navigator-triggered TSE and respiratory-triggered TSE was superior to that of breath-hold TSE with restore pulse and HASTE for the detection of all focal or solid hepatic lesions. The mean lesion-to-liver contrast-to-noise ratio (CNR) of solid lesions in navigator-triggered (P < 0.001) and respiratory-triggered TSE (P < 0.005) was significantly higher than that in HASTE.

CONCLUSION

High-resolution, free-breathing, T2-weighted MRI techniques can significantly improve the detectability of focal hepatic lesions and provide higher lesion-to-liver contrast of solid lesions compared to breath-hold techniques.

摘要

目的

评估两种高分辨率自由呼吸技术(导航触发式涡轮自旋回波 [TSE] 和呼吸触发式 TSE)以及两种标准分辨率屏气技术(带恢复脉冲的屏气 TSE 和半傅里叶采集单次激发 TSE [HASTE])所获得的 T2 加权图像上局灶性肝病变的图像质量和检测准确性。

材料与方法

我们机构的审查委员会批准了本研究,并获得了所有患者的书面知情同意。两名阅片者独立回顾了 50 例患者采用四种序列获得的 200 套 T2 加权成像。两名阅片者在第 1 阶段识别出所有局灶性病变,在第 2 阶段仅识别出实性病变。阅片者的信心采用 1 - 4 级评分(1≤50%;4≥95%)。采用自由响应式接收者操作特征(ROC)方法评估四种 MR 序列的诊断准确性。对肝脏、脾脏、肝病变及背景噪声的平均信号强度(SI)进行感兴趣区(ROI)测量。

结果

在检测所有局灶性或实性肝病变方面,导航触发式 TSE 和呼吸触发式 TSE 的准确性优于带恢复脉冲的屏气 TSE 和 HASTE。导航触发式(P < 0.001)和呼吸触发式 TSE(P < 0.005)中实性病变的平均病变 - 肝脏对比噪声比(CNR)显著高于 HASTE。

结论

与屏气技术相比,高分辨率、自由呼吸的 T2 加权 MRI 技术可显著提高局灶性肝病变的可检测性,并提供更高的实性病变 - 肝脏对比度。

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