STUDY ON A REAL-TIME PATTERN MEASUREMENT METHOD FOR BEAM DENSITY FIELDS FROM A FEW PROJECTIONS

研究了一种利用多方向投影数据快速重建回旋加速器束流截面的方法。该方法的要点是利用奇异值分解和采样模型对象，从少量投影中快速重建出一个（64*64）截面。在第一年，我们研究了一种新的算法，用于重建高分辨率图像。基于该重建算法的计算机仿真结果良好。在第二年，我们通过实际的X射线设备实验确认了图像重建。我们使用LED元件或聚光器的对象重建。预测方向为8。（64*64）重建图像良好。重建时间仅为0.2秒。使用X射线设备的几个实验表明，重建方法有可能投入实际使用。

The study is concerned with developing a fast reconstruction method for Cyclotron beam section using projection data from a few directions. The point of this method is rapidly to reconstruct a beam section (64*64) from a few projections, using the Singular Value Decompositions and the Sampling Model Object. In the first year, we investigated a new algorithm for reconstructing high resolution image. The result of computer simulation based on the reconstruction algorithm was good. In the second year, we confirmd image reconstructions experimentally by means of the actual X-ray equipment. We used LED element or condenser for the object reconstructed. Projecting directions were 8. The (64*64) image reconstructed was good. The reconstruction time was only 0.2 Sec.Several experiments using the X-ray equipment made it obvious that there is a possibility that the reconstruction method comes into practical use.