| 摘要 |
PROBLEM TO BE SOLVED: To improve penumbra in a short-range region without being accompanied by increase in costs, increase in penumbra in the outside of the short-range region, and increase in burden imposed on an operator, in a particle beam treatment system using a scanning irradiation method.SOLUTION: A particle beam treatment system comprises an irradiation compensator 101 targeted for a short-range region composed of an energy absorber 302, a first collimator 303, and a second collimator 304. The irradiation compensator 101 includes an attaching/detaching mechanism for the energy absorber 302, the first collimator 303, and the second collimator 304. The first collimator 303 is disposed in an upstream side where the beam diameter is small to help restrain the breadth of the compensator 101, thereby contributing the size reduction and weight saving of the compensator 101. The second collimator 304 is disposed in a downstream side, thereby contributing to the improvement of penumbra. |
