Lifetime evaluation apparatus and lifetime evaluation method for particle beam therapy system

摘要

A particle beam therapy system lifetime evaluation apparatus and lifetime evaluation method capable of performing a highly accurate lifetime evaluation for a particle beam therapy system with large fluctuations in sensor data obtained in a normal state. A first evaluation model is created by clustering a cathode voltage, a cathode current, and a grid current acquired in a certain period of a high-frequency amplifier circuit 57A, 58A of a particle beam therapy system 100 to define a normal data group. The components of the created first evaluation model are converted by a conversion function (sigmoid function that is an activation function), a normal data group is determined, and a second evaluation model is created. Sensor data is evaluated by the first evaluation model, if normal, the life is evaluated, if abnormal, the data is converted by a conversion function, and the converted data is evaluated by the second evaluation model as normal or abnormal. If normal, evaluate life. [Selection] Figure 3