Abdominal MR imaging with a volumetric interpolated breath-hold examination
Abdominal MR imaging with a volumetric interpolated breath-hold examination
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DOI：
10.1148/radiology.212.3.r99se34876
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发表时间：
1999-09-01
期刊：
影响因子：
19.7
通讯作者：
Weinreb, JC
中科院分区：
文献类型：
--
作者：
Rofsky, NM;Lee, VS;Weinreb, JC
目的：比较T1加权三维梯度回波(GRE)体部磁共振成像(VIBE)和二维(2D)GRE屏气检查。材料和方法：连续20例患者行1.5-MR成像。检查包括造影前、中(动脉期)和注射后(动脉相)的脂肪饱和2D GRE屏气成像和脂肪饱和容积内插屏气成像，薄层(2 mm源图像)和厚(8 mm重建图像)。对3幅图像进行定性和定量比较(信噪比[SNR]和对比噪声比[CNR])。结果：与其他两组数据相比，2 mm源图像的胰腺边缘清晰度较差(P<；.05)。在Gd增强图像上，增强后2D GRE图像在胰腺边缘清晰度、可见血管数量和动脉重影方面的得分显著较低。定量地说，8 mm重建图像在增强前后肝脏、主动脉和肾皮质的SNR测量显著高于2D GRE或2 mm源图像(P<；0.05)。8 mm重建图像的主动脉/脂肪CNR明显高于8 mm重建图像。结论：脂肪饱和容积内插屏气图像具有与常规脂肪饱和2D GRE图像相当的质量。
PURPOSE: To compare a T1-weighted, three-dimensional (3D), gradient-echo (GRE) sequence for magnetic resonance (MR) imaging of the body (volumetric interpolated breath-hold examination, or VIBE) with a two-dimensional (2D) GRE breath-hold equivalent.MATERIALS AND METHODS: Twenty consecutive patients underwent 1.5-MR imaging. The examinations included pre- and postcontrast (20 mL gadopentetate dimeglumine) fat-saturated 2D GRE breath-hold imaging and fat-saturated volumetric interpolated breath-hold imaging before, during (arterial phase), and after injection, with thin (2-mm source images) and thick (8-mm reconstruction images) sections. The three images were compared qualitatively and quantitatively (signal-to-noise ratio [SNR] and contrast-to-noise ratio [CNR]).RESULTS: Qualitatively, the 2-mm source images had poorer pancreatic edge definition on precontrast images compared with the other two data sets (P < .05). On gadolinium-enhanced images, scores for clarity of pancreatic edge, number of vessels visualized, and arterial ghosting were significantly lower for the postcontrast 2D GRE images. Quantitatively, SNR measurements in the liver, aorta, and renal cortex on pre- and postcontrast images were significantly higher for the 8-mm reconstruction images than for the 2D GRE or 2-mm source images (P < .05). Aorta-to-fat CNR was significantly higher on the 8-mm reconstruction images.CONCLUSION: Fat-saturated volumetric interpolated breath-hold images have quality comparable to that of conventional fat-saturated 2D GRE images.