PC平台MR图像后处理工作站的开发与扩散张量参数图的研究

The investigation of MR postprocessing workstation on PC and the study of the ADC parameter image

目的 研究并开发适合实验室磁共振图像后处理的PC平台的工作站。讨论图像后处理软件的PC水平的硬件工作环境。分析合成的人脑表观扩散系数 (ADC)参数图图像特点 ,讨论其临床应用价值。方法 对 6例正常人进行常规与功能性MR扩散成像扫描获得的结构与扩散张量参数图像 ,在市售PC机平台上运行Perfect Tech图像后处理软件进行各种ADC参数图的重建。结果 应用Perfect Tech软件在目前市售PC机硬件条件下可以实现MR功能性图像后处理与分析。ADC参数图表现为灰白质界限不清 ,呈等信号 ,白质区的各向异性被均化消除 :脑白质区ADC值平均为(7 5 9± 1 12 )× 10 -4 mm2 /s,灰质区ADC值平均为 (10 5 0± 4 34 )× 10 -4 mm2 /s ,两者间差异无显著性意义 ,脑脊液表现为高信号。在各向异性指数图 (AI)上表现为灰质区与白质区分界明显 ,灰质区表现为低信号 ,白质区的信号强度表现为高信号 ,扩散的各向异性被突出 ,白质区AI为 0 2 0± 0 0 9,灰质区AI为 0 0 9± 0 0 7,之间差异存在显著性意义 (t=4 13,P <0 0 1)。结论 可以在PC机水平上实现磁共振图像后处理以及功能性参数图的运算与显示 ,扩散张量参数图对临床与科研具有重大的实用价值。

Objective To investigate the MR postprocessing workstation on PC level.To discuss the hardware enviroment suitble for the lab MR postprocessing and the correspongding clinical diagnostic value. Methods MR diffuison-weighted imaging and routine MRI were performed in 6 normal adults.The ADC and AI parameter images were rebuilt by using Perfect-Tech (version 2.0) software on the market saled PC computer. Results The process and analysis could be performed sucessfully on the the market saled PC computer. On the ADCav images,the boundary between the grey matter(GM)and white matter(WM) was blurring and showed the similar intensity.The anistropy in white matter was averaged out on the ADCav images.The ADC value was (7.59±1.12)×10 -4 mm 2/s in WM and (10.50±4.34)×10 -4 mm 2/s in GM. On the AI images,there was sharp boundary between GM and WM,with hypointensity in GM and hyperintensity in WM. The anistropy contrast was enhanced on AI images. AI was 0.20±0.09 in WM and 0.09±0.07 in GM with statistically significant difference between them(t=4.13,P<0.01). Conclusion Functional parameter images could be calculated, reconstructed, and analyzed by using the MR postprocessing workstation on PC computer. The diffusion tensor imaging has great practical value in both clinical and research study.