A radiation image conversion panel that has a phosphor layer. The medical appliance may be deployed in a lumen of a human body and the external body may release the bioactive agent. With this configuration, deterioration can be prevented in the overall cooling properties, while at the same time the cooling properties of the rectifier can be enhanced. The process control arrangement is further configured and arranged to generate a plurality of motor control signals based on the speed information for controlling the speed of said motor. A system of invention provides a reference implementation of the method.