磁共振场强对脑部T1WI结构图像纹理特征的影响

Effect of Magnetic Resonance Field Intensity on Texture Characteristics of T1WI Structural Image in Brain

目的比较不同磁共振场强对脑部T1WI纹理特征的影响。资料与方法对30例健康成年人分别在磁共振1.5T(MR-1.5T)及3.0T(MR-3.0T)上行脑部3DT1WI结构像扫描。对3D结构像进行脑部灰质及白质分割,并采用灰度共生矩阵方法进行全脑纹理分析,纹理特征参数包括角二阶矩、对比度、自相关、逆差距及熵。结果 MR-3.0T全脑灰质熵高于MR-1.5T(2.170±0.059比2.163±0.054,F=4.465,P=0.039)。MR-3.0T全脑白质角二阶矩(0.734±0.008比0.736±0.007,F=11.368,P=0.001)及熵(1.392±0.051比1.397±0.042,F=10.612,P=0.002)低于MR-1.5T,MR-3.0T全脑白质逆差距高于MR-1.5T(0.875±0.005比0.873±0.004,F=10.776,P=0.002)。结论磁共振场强可影响脑部灰质及白质T1WI结构图像纹理特征。

Purpose To investigate the effect of different magnetic resonance field intensity on the texture features of the brain T1WI structural images. Materials and Methods The 3D T1WI structural image scans of the brain were performed on 30 healthy adults at 1.5T (MR-1.5T) and 3.0T MR (MR-3.0T). The brain structural images were segmented into gray matter and white matter and the whole brain texture analysis was performed by gray level co-occurrence matrix method. The texture feature parameters included the angular second moment, contrast, autocorrelation, inverse difference moment and entropy. Results The entropy of whole brain gray matter at MR-3.0T was higher than that at MR-1.5T (2.170±0.059 vs. 2.163±0.054, F=4.465, P=0.039). The angular second moment of whole brain white matter at MR-3.0T was lower than that at MR-1.5T (0.734±0.008 vs. 0.736±0.007, F=11.368, P=0.001). The entropy of whole brain white matter at MR-3.0T was lower than that at MR-1.5T (1.392±0.051 vs. 1.397±0.042, F=10.612, P=0.002). The inverse difference moment of whole brain white matter at MR-3.0T was higher than that at MR-1.5T (0.875±0.005 vs. 0.8731±0.004, F=10.776, P=0.002). Conclusion The MR field intensity could impact the texture feature of the gray matter and white matter T1WI structure of the brain.