Method and device for the reconstruction of three-dimensional images from cone beam projection data
First Claim
1. A method of reconstructing three-dimensional images from cone beam projection data of an object to be examined which is arranged in an examination zone, which method includes the steps of:
- (a) acquiring the cone beam projection data by means of an X-ray device which includes an X-ray source and an X-ray detector, the X-ray source being moved along a trajectory around the examination zone in order to acquire the projection data, (b) determining the contour of the sensitive detector surface of the X-ray detector on which the projection data was acquired, (c) determining pseudo-projection data in an overall outer zone, enclosing the sensitive detector surface in an annular fashion, from the projection data determined, and (d) reconstructing a three-dimensional image of the examination zone from the projection data acquired on the sensitive detector surface and from the pseudo-projection data determined in the outer zone.
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Abstract
The invention relates to a method of reconstructing three-dimensional images from cone beam projection data of an object to be examined which is arranged in an examination zone. In practice cone beam projections are usually cut off, because the object to be examined usually cannot be imaged completely in all imaging positions. An image which is reconstructed exclusively from the acquired projection data, therefore, does not have the highest possible image quality. In order to continue the projection data beyond the sensitive detector surface and hence obtain images of higher image quality, therefore, the invention proposes a method which includes the following steps:
(a) acquiring the cone beam projection data,
(b) determining the contour of the sensitive detector surface,
(c) determining pseudo-projection data in an overall outer zone from the projection data acquired, and
(d) reconstructing a three-dimensional image from the projection data and the pseudo-projection data.
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Citations
12 Claims
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1. A method of reconstructing three-dimensional images from cone beam projection data of an object to be examined which is arranged in an examination zone, which method includes the steps of:
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(a) acquiring the cone beam projection data by means of an X-ray device which includes an X-ray source and an X-ray detector, the X-ray source being moved along a trajectory around the examination zone in order to acquire the projection data, (b) determining the contour of the sensitive detector surface of the X-ray detector on which the projection data was acquired, (c) determining pseudo-projection data in an overall outer zone, enclosing the sensitive detector surface in an annular fashion, from the projection data determined, and (d) reconstructing a three-dimensional image of the examination zone from the projection data acquired on the sensitive detector surface and from the pseudo-projection data determined in the outer zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An X-ray device for reconstructing three-dimensional images from cone beam projection data of an object to be examined which is arranged in an examination zone, which device includes
(a) an X-ray source and an X-ray detector for the acquisition of cone beam projection data, the X-ray source being moved along a trajectory around the examination zone in order to acquire the projection data, (b) means for determining the contour of the sensitive detector surface of the X-ray detector on which the projection data was acquired, (c) means for determining pseudo-projection data in an overall outer zone, enclosing the sensitive detector surface in an annular fashion, from the projection data determined, and (d) a reconstruction unit for the reconstruction of one or more three-dimensional images of the examination zone from the projection data acquired on the sensitive detector surface and from the pseudo-projection data determined in the outer zone.
Specification