低场MR二维快速扰相梯度回波序列在颅脑检查中的应用

Low field MR 2D fast spoiled gradient echo sequence in application of cerebral scan

目的观察快速扰相梯度回波(2D FSPGR)在颅脑低场MR检查中的应用价值。方法随机对70例颅脑用翻转角(FA)为70°的2D FSPGR(2D FSPGR70°)获得T1加权图像,与常规自旋回波(SE)T1WI作对照,比较轴向图像的成像速度、血管显示、清晰度、增强效果、灰白质对比等方面,计算相关的质量控制参数,包括信噪比(SNR)、对比度(C)及对比噪声比(CNR)。结果2D FSPGR70°的图像具有成像快速、血管显示为高信号、增强效果佳等特点。2D FSPGR与SET1WI的SNR、C及CNR分别为81.98、0.116、6.58和87.15、0.117、7.18,二者基本相当。结论2D FSPGR70°在颅脑低场MR检查中具有许多SE T1WI无法比拟的优势,可以代替SE T1WI或作为T1加权的优先替补序列。

Objective To investigate the value of two dimensional fast spoiled gradient echo （2D FSPGR） sequence in the application of cerebral scan of low field MRI. Methods By 0. 2 T MR scanner, 70 cases underwent both 2D FSPGR and SE T1WI randomly, and the scan time, vessel display, definition, enhanced effect and grey-white contrast of 2D FSPGR and SE T1WI were compared. Results Two-dimensional FSPGR was characterized by short scan-time, high-signal vessel and excellent enhanced effect, with the results of SNR （81.98）, C （0. 116）, CNR （6.58） approximated to those of SE T1WI （SNR 87.15, C 0. 117, CNR 7.18）. Conclusion Two-dimensional FSPGR is superior to SE T1WI in many aspects with high value in the clinical application. It may replace SE T1WI or can be taken as a supplementary sequence for T1WI.