陽子線ブラッグピーク拡大幅可変型リッヂフィルターの開発

我们开发了一种脊状滤波器，可以通过远程控制来调节质子束在展开的布拉格峰中的剂量分布。该装置有4个块，其中一个块是MiX-DP块锥形的四分之一。每一对两个块被放置在彼此垂直相交的每条线上。这两条线的交点与质子束的轴线重合。我们可以通过调整每对质子束的两个块之间的距离，使质子束展开布拉格峰的剂量分布变得平坦。此外，我们可以在必要时对其进行调整，例如，在扩散布拉格峰的相对生物有效性随深度增加的情况下。

We developed a ridge filter that enables to adjust the dose distribution in a spread out Bragg peak of proton beam by remote control. This device has 4 blocks a block of which is a quarter of a conical shape of MiX-DP block. Each pair of two blocks is put on an each line perpendicularly intersecting each other. The intersecting point of these two lines is coincided with an axis of proton beam. We could flatten the dose distribution of spread out Bragg peak of proton beam by adjusting the distance between two blocks of each pair. We, moreover, can adjust it if necessary, for example, in a case that relative biological effectiveness in spread out Bragg peak increases with depth.