An injector drive device includes a power supply unit that is supplied with power from a battery mounted in a vehicle and generates a voltage higher than the voltage of the battery, and EDU having a drive unit that is supplied with power from the power supply unit and drives an injector. The grid defines a plurality of cells in which each scintillator crystal is completely disposed within in such a manner that an air layer exists between the scintillator crystal and the walls of the grid. The operation of the compression processing module 104 is controlled by a frame rate controller 110. The heartbeat generator sends heartbeats to the network interfaces, which pass the heartbeats around in a token ring configuration. Thereafter, a ROM image is built using the modules, some of which may have been modified, so that it may be installed within the customer’s system. Each of the data latches is configured to store data read from a respective one group of regular columns.