肝脏及上腹部MRI扫描序列的应用价值

The Values of Application of MRI Sequences in Liver and Upper Abdomen

目的 通过对六种扫描序列的分析与评价以期达到发现中低场强中最有价值的扫描序列及序列组合的目的。方法 对 2 6名临床怀疑肝脏病变的患者进行了MR检查 ,均应用了快速自旋回波 (TSE)的T2加权像 ,快速梯度回波 (TFE)的反相位T1加权像 ,快速自旋回波加脂肪抑制的T2加权像 ,标准自旋回波 (SE)的T1和T2加权像 ,快速梯度回波 (TFE)的动态增强扫描等六种扫描序列 ,对各序列的图像质量及腹部常见正常结构的显示进行了分析和评价。结果 快速自旋回波 (TSE)T2加权像图像质量最好 ,2 4 / 2 6例 ( 92 % )选择了这一扫描序列 ,其次为标准自旋回波(SE)的T1加权像 ,6/ 2 6例选择了这一扫描序列。图像质量最差的序列为标准自旋回波 (SE)T2加权像 ( 2 4 / 2 4 ,10 0 % )。其他三种扫描序列的图像质量则介于上述三种序列之间。经统计学分析TSE的T2加权像与其他五种扫描序列在图像质量上均存在显著差异 (P <0 .0 0 5 )。结论 腹部病变常规应做标准自旋回波T1加权像 ,快速自旋回波T2加权像 ,快速自旋回波加脂肪抑制和梯度回波反相位这四种序列 ,病变鉴别有困难时则可加做标准自旋回波的多回波序列和快速梯度回波的动态增强扫描序列。

Purpose To evaluate the value of six sequences of magnetic resonance imaging in liver and upper abdomen. Methods Twenty-six patients suspected focal liver disease underwent T1 and T2-weighed conventional SE, T2-weighted with and without fat-suppressed Turbo-SE, opposed phase fast field echo(FFE) and dynamic enhanced(T1-TFE) MR imaging at 0.5T. The image quality was analyzed with six sequences above mentioned. Results Quality analysis demonstrated that TSE imaging without fat suppressed had highest images quality; conventional T2-weighted SE imaging, the lowest. TSE imaging without fat-suppressed was preferred 92%(24/26 cases) of the time and conventional T1-weighted SE imaging 23.07%(6/26) of the time as regards overall imaging quality. There was statistically significant difference (P<0.005) between TSE without fat-suppressed and other five imaging sequences in image quality. Conclusion It is more important for us how to use reasonably the sequences in liver and upper abdomen than obtained high image quality.