8通道头部线圈和iPAT技术在MRI颅脑检查中的应用

Application of 8 channel array coil and iPAT technique in cranial MRI

目的:探讨8通道线圈和iPAT(integrated parallel acquisition techniques)技术在颅脑MRI检查中的应用价值。方法:运用常规头线圈、8通道头部线圈和8通道头部线圈加iPAT技术三种检查方法扫描水模以及颅脑健康志愿者22例和患各种脑部疾病患者74例。分别对上述三种检查方法对水模扫描所得图像的信噪比、对比度、对比噪声比和均匀度进行测量,对96例健康志愿者和患者扫描所得图像进行图像质量评价和比较。结果:运用常规头部线圈和8通道线圈两种检查方法水模扫描所得信噪比、对比度、对比噪声比和均匀度以及对志愿者和患者扫描图像质量两者比较均差异有显著性意义,8通道线圈和8通道线圈加iPAT技术之间差异无显著性意义,但后者扫描时间明显缩短。结论:8通道线圈能够明显提高图像的信噪比、对比度、对比噪声比,iPAT技术能够明显缩短各序列扫描时间,8通道线圈与iPAT技术的联合运用能够在显著缩短扫描时间的同时并保持良好的图像质量。

Objective：To explore the value of 8-channel array coil and iPAT technique in cnmial MRI. Methods：Aphantom, 22 voltmteers and 74 patients with vsrious cranial diseases were scanned with three methods, conventional head array （ circularly polarized） Coil, 8-channel array coil and 8-channel array coil with iPAT technique. Signal-to-noise ratio （SNR）, contrast, contrast-to-noise ratio （CNR） and homogeneity of the images from the phantom scanned with the three methods were messured. The image quality of 22 volunteers and 74 patients were evaluated and compared. Results： There was a significant difference in SNR, contrast, CNR, homogeneity and image quality between the conventional head array coil and 8-channel array coil （ including 8-channel array coil with iPAT） and no any difference between 8-channel array coil and 8-channel array coil with iPAT. Acquisition time with 8-channel array coil with iPAT was shorter than the other two methods. Conclusion： Eight channel array coil can obviously increase SNR, contrast, CNR, homogeneity of images. iPAT technique can evidently decrease the acquisition time of the sequences. The combining use of 8-channel array coil and iPAT technique can consumedly shorten scanning time and keep a high image quality.