To enhance the durability of the V-shaped belt by allowing the strength and the heat-radiating property of the resin blocks to stand together at high levels in the V-shaped belt, which has a plurality of resin blocks and endless connecting members connecting the resin blocks. The ejection nozzle is supplied with compressed gas through a supply line having an inlet end for connection with a source of compressed gas and an outlet end communicating with the ejection nozzle. It is then determined whether a predetermined error has occurred. Data traffic is transmitted between the nodes in the first and second subnets via the configured routers in the packets of the first class. As another aspect of the X-rays CT apparatus, there is provided a data conversion unit configured to convert cone beam data into parallel beam data and a fluoroscopic image creation unit configured to create a fluoroscopic image on a plane based on the parallel beam data.