Development of the spatio-temporal measurement system using real-time NMR imaging

为开发“利用实时核磁共振成像的时空测量系统”，规划了三个子项目：核磁共振信号的快速生成、利用核磁共振信号实时重建核磁共振图像、开发三维核磁共振图像数据显示和分析软件。在第一个项目中，我们引入了一种可以产生快速强磁场梯度的梯度射频探头，并使用数字信号处理器（DSP）板开发了一种用于MRI的高性能脉冲程序。结果，我们成功地在32mm x 32mm视场（FOV）中以80ms时间间隔获得连续的二维核磁共振图像。对于第二个项目，我们演示了实时图像重建和显示系统可以使用带有商用AD转换板的高性能个人计算机构建。结果，我们成功地重建并显示了约50毫秒的128 x 128像素核磁共振图像。第三个项目，我们在Microsoft Windows95上开发了用于实时三维核磁共振成像的表面绘制软件和体绘制软件。利用这些项目获得的成果，我们构建了世界上第一个实时三维核磁共振成像系统。

To develop the "apatio-temporal measurement system using real-time NMR imaging", three sub-projects were planned : fast generation of NMR signal, real-time NMR image reconstruction using the NMR signal, and development of display and analysis software for 3D NMR image data. For the first project, we introduced a gradient-RF probe which can generate fast and intense magnetic field gradients and developed a high-performance pulse programr for MRI using a digital signal processor (DSP) board. As a result we succeeded to acquire successive 2D NMR images at the 80 ms time intervals in the 32 mm x 32 mm field of view (FOV). For the second project, we demonstrated that the real-time image reconstruction and display system can be built using a high performance personal computer with a commercial AD converter board. As a result, we have succeeded to reconstruct and display a 128 x 128 pixel NMR image at about 50 ms. For the third project, we have developed surface rendering software and volume rendering software on Microsoft Windows95 for real-time 3D NMR imaging. Using the results obtained in these projects, we constructed the world's first real-time 3D NMR imaging system.