| 摘要 |
An X-ray diagnostic system for angiographic X-ray examinations having an X-ray source for irradiating a patient, a television image intensification chain, and an image subtraction device for producing images which are the result of the difference between images taken at a progression of discrete times during which the concentration of an X-ray contrast medium in blood vessels changes. The subtraction device is provided with two image memories. A control device having a preprogrammable memory controls the times at which image data are stored in the image memories. The preprogrammable memory may be programmed for each time of image storage, or may be programmed only for the times of storage in the first image memory and a time delay factor for storage in the second image memory relative to the times of storage in the first image memory. The time delay factor may be constant or variable.
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