"It has proven advantageous if after the sorting pass a fourth image processing step is performed on the at least one roadmap image, the fourth image processing step being able to enhance contrast, suppress noise and/or increase sharpness.
"Advantageously, the processing of the vessel image and of the at least one object image according to step f) can be a subtraction.
"According to the invention an addition of a constant can be performed at least after one of the subtractions according to steps b), c) and f).
"Advantageously, a binary operation, in particular threshold value forming or a segmentation, can be performed as the processing of the at least one second subtraction image for forming at least one object image according to step e).
"According to the invention the method can be a roadmap method or a method for overlaying a fluoroscopy image over a DSA image (overlay reference).
"It has proven advantageous if the processing of the vessel image and of the at least one object image according to step f) is a merging to form one optimal roadmap image having a fixed grayscale value, in particular black or colored.
"The object is achieved according to the invention in the case of a device for performing the above-cited method by means of an angiographic X-ray system having a C-arm X-ray machine on the C-arm of which an X-ray emitter and an X-ray detector are arranged, having an image system for receiving the output signals of the X-ray detector, having storage means, and having a monitor for playing back the signals processed by the image system, in which the image system additionally has a first subtraction stage for subtracting the native image and the mask image in order to obtain a first subtraction image in which only the vascular tree can be distinguished, a first image processing step for improving the visibility of the vascular tree so that an optimal vessel image is obtained, a second subtraction stage for subtracting the native image and at least one of the native images of the fluoroscopy image series in order to obtain a second subtraction image in which only the object can be distinguished, a second image processing step for improving the visibility of the object so that at least one optimal object image is obtained, and a further image processing step for forming at least one roadmap image from the vessel image and the at least one object image.
"According to the invention the third image processing step can include a third subtraction stage for subtracting the vessel image and at least one of the object images.
"Alternatively the second image processing step can be embodied for performing a binary operation, in particular threshold value forming or a segmentation, and the third image processing step can be embodied for overlaying the vessel image and at least one of the binarily extracted object images.
"It has proven advantageous if the image system additionally has addition stages downstream of the subtraction stages for the addition of a constant for setting the mean grayscale value."
For additional information on this patent, see: Spahn, Martin. Method for Enhanced Visualization of Objects in Interventional Angiographic Examinations. U.S. Patent Number 8509384, filed
Keywords for this news article include: Robotics, Machine Learning, Emerging Technologies,
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