颅脑组织的磁共振成像过程模拟

Simulation of Brain and Skull Magnetic Resonance Imaging

目的:研究实现对磁共振成像(MRI)多参数、特定成像序列下的模拟成像。方法:从颅脑组织基本特性出发,基于布洛赫方程求解弛豫过程,再按照实际磁共振设备成像方法,用计算机模拟磁共振信号生成。并将信号采集映射到k空间,最后重建出图像。结果:重建图像和实际临床运用产生磁共振图比较接近。在此基础上对于部分k空间数据重建,快速成像序列的成像也可以仿真实现。结论:该方法直观、定量,便于实现磁共振成像过程模拟,可以用于医学影像物理学的辅助教学,也可以作为成像方法过程、重建算法、质量保证、图像后处理等研究的数据准备。

To perform simulated MRI with multi-parameters and special sequence. ~ For given brain and skull tissue with special pulse sequence, the relaxation process was solved based on Bloch equation. Mocking the way MRI equipment worked, the signal data was mapped to k-space, and then the ultimate weighted images could be reconstructed. Simulated results conformed to the weighted images gotten in clinical operation. Sophisticated technologies such as partial k-space and fast spin echo sequence reconstruction could also be simulated in similar way. The method above can simulate MRI process, and thus can be used for auxiliary teaching of medical imaging physics and also for data preparation of reconstruction algorithm, quality assurance, image post-processing and etc.