A description will now be given of the operation of the voice instructing apparatus at the time a patient is actually scanned by CT apparatus 8, under the given conditions that many instructing voices are stored in RAM 1b of recording/playback device 1 and {HEAD ~ each patient ID data} and scan condition data have been registered in {TAIL ~ host controller} 4 
A description will now be given of the operation of the voice instructing apparatus at the time a patient is actually scanned by CT apparatus 8 , under the given conditions that many instructing voices are stored in RAM 1b of recording / playback device 1 and { HEAD ~ each patient ID data } and scan condition data have been registered in { TAIL ~ host controller } 4
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