Water excitation as an alternative to fat saturation in MR imaging: Preliminary results in musculoskeletal imaging
Water excitation as an alternative to fat saturation in MR imaging: Preliminary results in musculoskeletal imaging
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DOI：
10.1148/radiol.2243011227
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发表时间：
2002-09-01
期刊：
影响因子：
19.7
通讯作者：
Diard, F
中科院分区：
文献类型：
--
作者：
Hauger, O;Dumont, E;Diard, F
目的：比较脂肪抑制方法，使用光谱选择性脂肪饱和和部分选择性水激发在标准的磁共振（MR）成像序列中使用的日常日常musculoskeletal practice.Materials和方法：83例患者进行了MR检查与1.5-T系统。通过使用三种常见序列比较两种方法：注射造影剂后进行的T1加权自旋回波（SE）成像（n=24），中间加权快速SE成像（n=36）和T2加权快速SE成像（n=36）。定量比较了两种方法的序列采集时间以及骨、肌肉、脂肪和水的信噪比和对比噪声比。然后由两名放射科医生对图像进行定性审查，他们对所使用的脂肪抑制类型不知情。根据四个标准（脂肪抑制的均匀性、敏感性和折叠伪影、病变的显著性和整体图像质量），使用五分量表（0，差; 1，差; 2，一般; 3，好; 4，优秀）对图像质量进行评分。采用配对t检验比较定量数据，非参数配对数据Wilcoxon符号秩检验用于定性analysis.Results：水激发允许采集时间大幅减少（高达50%）为T1加权序列。定量测量显示更大的信噪比（P
Purpose: To compare fat suppression methods by using spectrally selective fat saturation and section-selective water excitation in standard magnetic resonance (MR) imaging sequences used in day-to-day musculoskeletal practice.Materials and Methods: Eighty-three patients underwent MR examination witha 1.5-T system. The two methods were compared by using three common sequences: T1-weighted spin-echo (SE) imaging performed after contrast material injection (n=24), intermediate-weighted fast SE (n=36) imaging, and T2-weighted fast SE (n=36) imaging. Acquisition times of the sequences and signal-to-noise and contrast-to-noise ratios of bone, muscle, fat, and water for the two methods were compared quantitatively. Images were then qualitatively reviewed by two radiologists who were blinded to the type of fat suppression used. Image quality was scored according to four criteria (homogeneity of fat suppression, susceptibility and foldover artifacts, conspicuousness of lesion, and overall image quality) by using a five-point scale (0, bad; 1, poor; 2, fair; 3, good; and 4, excellent). A paired Student t test was used to compare the quantitative data, and a nonparametric paired-data Wilcoxon signed rank test was used for qualitative analysis.Results: Water excitation allowed a substantial decrease in acquisition time (by up to 50%) for T1-weighted sequences. Quantitative measurements revealed a greater signal-to-noise ratio (P