Diagnostic radiology system for angiographic X-ray examinations
AssigneeSiemens Aktiengesellschaft
InventorBurkhard Grosse
Life of this patent
Estimating the term…
Abstract
An exemplary embodiment comprises an image intensifier television pickup installation, at least one image memory, a subtraction device for the subtraction of image data occurring at different times, and a video monitor, in which there are supplied to the subtraction device the current video signal and a video signal averaged over several images in the image memory. There is connected to the subtraction device a maximum detector which recognizes the maximum of the contrast medium flow. The maximum detector is connected to the image memory for effecting the storage of a filling image.
Claims15
Diagnostic radiology system for angiographic X-ray examinations, comprising an image intensifier television installation including an image intensifier and a video camera, at least one image memory connected with said video camera, a subtraction device for coupling with the video camera and with the image memory and operable for effecting subtraction of image data occurring at different times, a video monitor for coupling with said subtraction device, characterized in that there are supplied to the subtraction device a current video signal from the video camera and a video signal averaged over several images from the image memory, a maximum detector is connected with the subtraction device, said maximum detector being responsive to the maximum of the contrast medium flow, and being connected to the image memory for controlling the storage of a filling image thereby.
A medical imaging system comprising:
- image substraction means for subtracting respective image signals supplied thereto, and having an output for supplying a resultant signal,
- image signal generating means for generating image signals representing successive radiation images of a subject exhibiting a density which progressively increases, reaches a maximum, and then decreases over a given time span, said image signal generating means supplying successive individual image signals to said image subtraction means during said time span which have amplitude values which vary according to the density exhibited by the subject as a function of time,
- image processing means supplying to said image subtraction means during said time span successive averaged image signals each averaged over successive individual image signals from said image signal generating means such that the averaged image signals reach a maximum amplitude value at a point in time after the individual image signal having a maximum in amplitude value, and
- maximum detector means connected with the output of the image subtraction means and sensing when an individual image signal supplied to the image subtraction means has an amplitude value less than that of an averaged image signal concurrently supplied to said image subtraction means during said time span, for detecting the maximum in the density exhibited by the subject independently of the density level of such maximum.
Dependencies are inferred from the claim text.