A coil bobbin has a body part, a first outer flange part provided at one end of the body part and a second outer flange part provided at the other end of the body part. The input circuitry receives a specifying operation for specifying, from a region of a first medical image acquired such that the first medical image contains less noise, a region for which a second medical image that is a higher-definition image than the first medical image is acquired. Furthermore, the said set is reduced by the logic verification step. Using the primary and secondary beacon signals, the nodes generate local phase and frequency estimates which are used to control local phases and frequencies of the source nodes.