Method for reconstructing a three-dimensional image volume and x-ray devices
First Claim
1. A method for reconstructing a three-dimensional image volume of a region of interest of a patient, comprising:
- recording a plurality of individual two-dimensional projection images of the region of interest during a rotation of a recording system comprising an x-ray source and an x-ray detector with a constant relative position between a focal point of the x-ray source and the region of interest, the recording system being rotated about a first rotation center between the radiation source and the x-ray detector and simultaneously about a second rotation center in the focal point of the x-ray source;
combining the individual two-dimensional projection images to produce a plurality of extend two-dimensional projection images of the region of interest by a control and computing unit; and
reconstructing the three-dimensional image volume of the region of interest from the extend two-dimensional projection images with a reduced artifact by the control and computing unit for medically examining the patient.
2 Assignments
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Accused Products
Abstract
To enable an artifact free reconstruction even in the case of large regions of interest and with scanning paths of below 360°, provision is made for a method, with which a three-dimensional image volume is reconstructed from a number of two-dimensional projection images of a region of interest, which were recorded about the region of interest during a rotation of a recording system, comprising an x-ray source with a focal point and a detector, by calculating the gray scale values of the voxels of the image volume by back projection of the projection images, with which each two-dimensional projection images is composed in each instance from at least two individual projection images to form an extended two-dimensional projection image, with the respectively at least two individual projection images being recorded with a constant relative position between the focal point and the region of interest.
203 Citations
20 Claims
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1. A method for reconstructing a three-dimensional image volume of a region of interest of a patient, comprising:
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recording a plurality of individual two-dimensional projection images of the region of interest during a rotation of a recording system comprising an x-ray source and an x-ray detector with a constant relative position between a focal point of the x-ray source and the region of interest, the recording system being rotated about a first rotation center between the radiation source and the x-ray detector and simultaneously about a second rotation center in the focal point of the x-ray source; combining the individual two-dimensional projection images to produce a plurality of extend two-dimensional projection images of the region of interest by a control and computing unit; and reconstructing the three-dimensional image volume of the region of interest from the extend two-dimensional projection images with a reduced artifact by the control and computing unit for medically examining the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An x-ay device for reconstructing a three-dimensional image volume of a region of interest of a patient, comprising:
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a recording system comprising an x-ray source and an x-ray detector that records a plurality of individual two-dimensional projection images of the region of interest by rotating the recording system about a first rotation center between the x-ray source and the x-ray detector and simultaneously about a second rotation center in a focal point of the x-ray source; and a control and computing unit that; combines the individual two-dimensional projection images to produce an extend two-dimensional projection image, and reconstructs the three-dimensional image volume from the extend two-dimensional projection image with a reduced artifact. - View Dependent Claims (14, 15, 16)
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17. An x-ray device for reconstructing a three-dimensional image volume of a region of interest of a patient, comprising:
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a recording system comprising an x-ray source and an x-ray detector that records a plurality of individual two-dimensional projection images of the region of interest by rotating the recording system about a first rotation center between the radiation source and the x-ray detector; an adjustable patient support table that rotates the region of interest about a second rotation center in a focal point of the x-ray source; and a control and computing unit that; combines the individual two-dimensional projection images to produce an extend two-dimensional projection image, and reconstructs the three-dimensional image volume from the extend two-dimensional projection image with a reduced artifact. - View Dependent Claims (18, 19, 20)
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Specification