A radiographic apparatus includes a radiation source that irradiates radiation, a first grating unit, a grating pattern unit, a radiological image detector, and a support unit. According to the communication method, the host apparatus is connected to the device when the host apparatus uses the device, to improve effective and convenient use of the device. A substrate is then exposed with the electromagnetic source to define the nozzles having the re-entrant profile. An implantable medical device can then be navigated relative to the mapping data.