| 摘要 |
Image data of a plurality of frames obtained upon irradiating a radiation onto an object to be examined, the object being injected with a catheter in a blood vessel thereof, are converted into digital image of a plurality of frames by an A/D. Digital image data of a first predetermined frame and digital image data of a second predetermined frame prior to the first predetermined frame, which are converted by the A/D, are alternately stored in first and second memories. A difference between the digital image data of the first predetermined frame output from the A/D and the digital image data of the second predetermined frame output from the one of first and second memories is calculated by a subtractor to obtain subtraction image data denoting a motion of the catheter. This subtraction image data is multiplied by a multiplier with a predetermined weighting factor input by a console to emphasize the subtraction image data, thereby displaying subtraction image data emphasized in correspondence with the catheter motion on a TV monitor.
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