Routine clinical brain MRI sequences for use at 3.0 Tesla
Routine clinical brain MRI sequences for use at 3.0 Tesla
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DOI：
10.1002/jmri.20356
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发表时间：
2005-07-01
影响因子：
4.4
通讯作者：
van Zijl, PCM
中科院分区：
文献类型：
--
作者：
Lu, HZ;Nagae-Poetscher, LM;van Zijl, PCM
目的：建立3.0 T下某些常规临床脑MRI脉冲序列的图像参数，目的是尽可能保持日常临床诊断中充分表征的1.5 T图像对比度特征。材料和方法：10名健康受试者在1.5-T和3.0-T系统上扫描，测量主要灰质和白色结构的T-1和T-2弛豫时间。弛豫时间随后用于确定自旋回波（SE）、T-1加权、快速自旋回波（FSE）或快速自旋回波（TSE）、T-2加权和液体衰减反转恢复（FLAIR）脉冲序列的3.0 T采集参数，这些脉冲序列的图像特征与1.5 T相当，以便于常规临床诊断。应用常规临床序列对10例正常人、5例正常人和5例不同病变患者进行了研究。与1.5 T下的值相比，3.0 T下的值分别长14%至30%和短12%至19%。取决于所评估的区域。当使用适当的参数时，在3.0 T下获得的常规临床图像显示出与在1.5 T下获得的图像相似的图像特征，但具有更高的信噪比（SNR）和对比度噪声比（CNR），这可用于减少平均值和扫描次数。这些序列的推荐成像参数provided.Conclusion：当参数的弛豫率的变化进行调整，在3.0 T的常规临床扫描可以提供类似的法师外观为1.5 T，但具有上级图像质量和/或速度增加。
Purpose: To establish image parameters for some routine clinical brain MRI pulse sequences at 3.0 T with the goal of maintaining, as much as possible, the well-characterized 1.5-T image contrast characteristics for daily clinical diagnosis. while benefiting from the increased signal to noise at higher field.Materials and Methods: A total of 10 healthy subjects were scanned on 1.5-T and 3.0-T systems for T-1 and T-2 relaxation time measurements of major gray and white matter structures. The relaxation times were subsequently used to determine 3.0-T acquisition parameters for spin-echo (SE), T-1-weighted, fast spin echo (FSE) or turbo spin echo (TSE), T-2-weighted, and fluid-attenuated inversion recovery (FLAIR) pulse sequences that give image characteristics comparable to 1.5 T, to facilitate routine clinical diagnostics. Application of the routine clinical sequences was performed in 10 subjects, five normal subjects and five patients with various pathologies.Results: T-1 and T-2 relaxation times were. respectively, 14% to 30% longer and 12% to 19% shorter at 3.0 T when compared to the values at 1.5 T. depending on the region evaluated. When using appropriate parameters, routine clinical images acquired at 3.0 T showed similar image characteristics to those obtained at 1.5 T, but with higher signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR), which can be used to reduce the number of averages and scan times. Recommended imaging parameters for these sequences are provided.Conclusion: When parameters are adjusted for changes in relaxation rates, routine clinical scans at 3.0 T can provide similar mage appearance as 1.5 T, but with superior image quality and/or increased speed.