Multicontrast black-blood MRI of carotid arteries: Comparison between 1.5 and 3 Tesla magnetic field strengths
Multicontrast black-blood MRI of carotid arteries: Comparison between 1.5 and 3 Tesla magnetic field strengths
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DOI：
10.1002/jmri.20562
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发表时间：
2006-05-01
影响因子：
4.4
通讯作者：
Yuan, C
中科院分区：
文献类型：
--
作者：
Yarnykh, VL;Terashima, M;Yuan, C
目的：比较3 T和1.5T黑血颈动脉多对比造影成像，并评估1.5T和3 T颈动脉形态学测量之间的兼容性。材料和方法：5名健康亚动脉和2名动脉粥样硬化患者在1.5T和3 T扫描仪上进行扫描，使用类似的协议提供横向T-1-，T-2-和质子密度（PD）-重量：使用快速自旋回波序列和单层（T-1加权）或多层（PD/T-2加权）双反转恢复（DRIVE）制备的艾德黑血图像。对44个动脉断面的管壁和管腔信噪比（SNR）及管壁/管腔对比噪声比（CNR）进行配对t检验。结果：在3 T时，壁SNR和腔/壁CNR显著增加（P < 0.0001），T1加权图像增加1.5倍，PD/T2加权图像增加1.7/1.8倍。单层DIRT 1加权图像的管腔SNR无差异（P = 0.2）。但在3 T时，多层螺旋CT PD-/T-2加权图像的值更大（P = 0.01/0.03）。LA、WA和MVVT显示出良好的一致性，无显著偏倚（P0.5），变异系数（CV）<10%，组内相关系数（ICC）> 0.95。结论：本研究显示3 T高分辨率颈动脉黑血成像的SNR、CNR和图像质量显著改善。形态学测量在1.5T和3 T之间兼容。
Purpose: To compare black-blood multicontrast carotid imaging at 3T and 1.5T and assess compatibility between morphological measurements of carotid arteries at 1.5T and 3T.Materials and Methods: Five healthy sub jects and two atherosclerosis patients were scanned in 1.5T and 3T scanners with a similar protocol providing transverse T-1-, T-2-, and proton density (PD)-weight:ed black-blood images using a fast spin-echo sequence with single- (T-1 -weighted) or multislice (PD-/T-2-weighted) double inversion recovery (DIR) preparation. Wall and lumen signal-to-noise ratio (SNR) and wall/lumen contrast-to-noise ratio (CNR) were cornpared in 44 artery cross-sections by paired t-test. Interscanner variability of the lumen area (LA), wall area (WA), and mean wall thickness (MWT) was assessed using Bland-Altman analysis.Results: Wall SNR and lumen/wall CNR significantly increased (P < 0.0001) at 3T with a.1.5-fold gain for T-1-weighted images and a 1.7/1.8-fold gain for PD-/T-2-weighted images. Lumen SNR did not differ for singleslice DIRT1-weighted images (P = 0.2). but was larger at 3T for multislice DIR PD-/T-2-weighted images (P = 0.01/0.03). The LA, WA, and MVVT demonstrated good agreement with no significant bias (P 0.5), a coefficient of variation (CV) of < 10%, and intraclass correlation coefficient (ICC) of > 0.95.Conclusion: This study demonstrated significant improvement in SNR, CNR, and image quality for high-resolution black-blood imaging of carotid arteries at 3T. Mor-phologic measurements are compatible between 1.5T and 3T.