Device and method for generating a three dimensional vascular model
First Claim
1. A device for generating a three-dimensional model of a spatial structure comprising:
- an imaging unit for generating two-dimensional projection images of the spatial structure from various directions;
a display unit that is coupled to the imaging unit for displaying one of the projection images as a reference image, in which connection the display unit comprises input means in order to make possible the interactive specification of at least one image point in a segment of the spatial structure as a reference point;
a data processing device that is coupled to the imaging unit and the display unit and is designed to reconstruct a space point corresponding to the reference point of the structure from further projection images produced from other directions using the image-processing unit, wherein the space point is reconstructed by evaluating other image points of the further projection images that lie on a respective epipolar line of the reference point, wherein gray scale values corresponding to the other image points are projected on a projection line of the reference point and added to form a sum profile having constructive superimposition of the gray values of multiple epipolar lines and averaging out the contributions of other vascular segments, thereby determining a space point of a vascular segment and wherein said space point is defined as that position on the projection line of the reference point at which the sum profile assumes an extreme.
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Abstract
The invention relates to a method for the reconstruction of a three-dimensional model of a vascular tree from two-dimensional X-ray projection images (A, B, C) that are taken from different spatial directions. On a first projection image (A) at least one reference point (CA) is specified. The gray-value profiles along the epipolar lines (EB, EC) for said reference point (CA) in other projection images (B, C) are then projected on the projection line (L) of the reference point (CA) and added there punctiformly to form a sum profile (S). The sum profile (S) has an extreme, for example, a gray-value minimum, at the position of the space point (C3D) belonging to the reference point (CA). In this way, it is possible to reconstruct semiautomatically a vascular tree from X-ray projections.
89 Citations
15 Claims
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1. A device for generating a three-dimensional model of a spatial structure comprising:
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an imaging unit for generating two-dimensional projection images of the spatial structure from various directions; a display unit that is coupled to the imaging unit for displaying one of the projection images as a reference image, in which connection the display unit comprises input means in order to make possible the interactive specification of at least one image point in a segment of the spatial structure as a reference point; a data processing device that is coupled to the imaging unit and the display unit and is designed to reconstruct a space point corresponding to the reference point of the structure from further projection images produced from other directions using the image-processing unit, wherein the space point is reconstructed by evaluating other image points of the further projection images that lie on a respective epipolar line of the reference point, wherein gray scale values corresponding to the other image points are projected on a projection line of the reference point and added to form a sum profile having constructive superimposition of the gray values of multiple epipolar lines and averaging out the contributions of other vascular segments, thereby determining a space point of a vascular segment and wherein said space point is defined as that position on the projection line of the reference point at which the sum profile assumes an extreme. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for displaying a three-dimensional model of a vascular spatial structure with an imaging unit comprising the following steps:
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a) operating an imaging unit to generate two-dimensional projection images of the structure taken from different directions, the images comprising a single reference image and further projection images; b) displaying the reference image; c) using a pointer appliance to mark at least one image point on the single reference image in a segment of the spatial structure as a reference point; d) operating a computer of the imaging unit to automatically find a space point corresponding to the reference point by performing the steps; projecting gray scale values corresponding to image points on epipolar lines in the further projection images which correspond to the reference point on a projection line of the reference point; summing the gray scale values to form a sum profile having constructive superimposition of the gray values of multiple epipolar lines and averaging out the contributions of other vascular segments, thereby determining a space point of a vascular segment defined as that position on the projection line of the reference point at which the sum profile assumes an extreme; and e) repeating step d) for each image point marked on the reference image of the spatial structure in step c), thereby generating a three-dimensional model of a spatial structure; f) displaying the three-dimensional model. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification