When CT apparatus 8 starts scanning the patient in response to {HEAD ~ a command} from {TAIL ~ scan controller} 3, an instructing voice is read out from the designated channel in accordance with the data in the channel designation buffer at the proper timing in synchronism with the scanning operation, and is supplied through an amplifier 6 to a speaker 7 for its reproduction 
When CT apparatus 8 starts scanning the patient in response to { HEAD ~ a command } from { TAIL ~ scan controller } 3 , an instructing voice is read out from the designated channel in accordance with the data in the channel designation buffer at the proper timing in synchronism with the scanning operation , and is supplied through an amplifier 6 to a speaker 7 for its reproduction
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