Method for production of tomographic slice images of an examination object using at least two X-ray beams at offset angles, and a computed tomography scanner for carrying out this method
First Claim
1. A method for production of tomographic slice images of an examination object using a computed tomography scanner, comprising:
- scanning an examination object using at least two X-ray beams, the beams being at offset angles and fanning out from a focus to an opposite detector with a large number of detector elements, with scans at least partially overlapping, measuring detector output data from the detector elements, representing attenuation of the beams passing through the examination object, together with direct or indirect physical orientation data of the beams and converting the data to projection data sets; and
calculating image slices, from the projection data sets of the at least two scanning X-ray beams, wherein data from a sum of scans with a projection interval of at least 180°
is used for each complete slice image and includes the measurement data from the at least two scanning X-ray beams, and wherein, in order to calculate the complete slice images, data redundant from the measured data of the at least two X-ray beams from overlapping projection intervals is used for each complete slice image, the size of the overlap area of the projection data used from the individual X-ray beams being defined before the calculation of the slice images, to vary time resolution and image quality.
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Abstract
A method is disclosed for production of tomographic slice images of an examination object using a computed tomography scanner. In order to scan an examination object, at least two X-ray beams are produced, which each are at offset angles and fan out from a focus to an opposite detector and scan the examination object. The scans at least partially overlap. Detector output data which is emitted from the detector elements is measured together with physical orientation data of the beams and is converted to projection data sets. Slice images are then calculated. In order to calculate the complete slice images, data which is redundant from the measured data of the at least two X-ray beams from overlapping projection intervals is used for each complete slice image. The size of the overlap area of the projection data used from the individual X-ray beams is defined before the calculation of the slice images, in order to vary time resolution and image quality.
37 Citations
23 Claims
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1. A method for production of tomographic slice images of an examination object using a computed tomography scanner, comprising:
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scanning an examination object using at least two X-ray beams, the beams being at offset angles and fanning out from a focus to an opposite detector with a large number of detector elements, with scans at least partially overlapping, measuring detector output data from the detector elements, representing attenuation of the beams passing through the examination object, together with direct or indirect physical orientation data of the beams and converting the data to projection data sets; and
calculating image slices, from the projection data sets of the at least two scanning X-ray beams, wherein data from a sum of scans with a projection interval of at least 180°
is used for each complete slice image and includes the measurement data from the at least two scanning X-ray beams, and wherein, in order to calculate the complete slice images, data redundant from the measured data of the at least two X-ray beams from overlapping projection intervals is used for each complete slice image, the size of the overlap area of the projection data used from the individual X-ray beams being defined before the calculation of the slice images, to vary time resolution and image quality. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 17, 18, 19)
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12. A computed tomography scanner for production of slice image sequences of an examination object, comprising:
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means for production of at least two X-ray beams, each originating from a focus in a fan shape and for rotating about a common system axis in order to scan the object;
means for reconstruction of slice image sequences from detector output data produced by the at least two X-ray beams; and
an input apparatus, provided for a desired overlap of the detector output data used from the at least two X-ray beams, in order to calculate the slice images. - View Dependent Claims (13, 14, 15, 16, 20, 22, 23)
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21. A computed tomography scanner for production of slice image sequences of an examination object, comprising:
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means for scanning an examination object using at least two X-ray beams, the beams being at offset angles and fanning out from a focus to an opposite detector with a large number of detector elements, with scans at least partially overlapping, means for measuring detector output data from the detector elements, representing attenuation of the beams passing through the examination object, together with direct or indirect physical orientation data of the beams and converting the data to projection data sets; and
means for calculating image slices, from the projection data sets of the at least two scanning X-ray beams, wherein data from a sum of scans with a projection interval of at least 180°
is used for each complete slice image and includes the measurement data from the at least two scanning X-ray beams, and wherein, in order to calculate the complete slice images, data redundant from the measured data of the at least two X-ray beams from overlapping projection intervals is used for each complete slice image, the size of the overlap area of the projection data used from the individual X-ray beams being defined before the calculation of the slice images, to vary time resolution and image quality.
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Specification