Method for reconstructing tomograms from detector measured data of a tomography unit
First Claim
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1. A reconstruction method in computed tomography, comprising:
- scanning an examination object with a beam that rotates during scanning about a system axis;
determining absorption coefficients of subvolumes that are relatively remote from the system axis; and
subsequently determining absorption coefficients of subvolumes relatively nearer to the system axis, iteratively, taking account of the absorption coefficients already calculated.
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Abstract
A reconstruction method is used in computed tomography, wherein an examination object is scanned with a beam that rotates during scanning about a system axis. In the method, firstly the absorption coefficients of subvolumes relatively remote from the system axis are determined. Subsequently the absorption coefficients of the subvolumes situated relatively nearer to the system axis are determined iteratively, taking account of the absorption coefficients already calculated.
25 Citations
27 Claims
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1. A reconstruction method in computed tomography, comprising:
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scanning an examination object with a beam that rotates during scanning about a system axis;
determining absorption coefficients of subvolumes that are relatively remote from the system axis; and
subsequently determining absorption coefficients of subvolumes relatively nearer to the system axis, iteratively, taking account of the absorption coefficients already calculated. - View Dependent Claims (2, 3, 4, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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5. A method for reconstructing tomographs from detector measured data of a tomography unit, comprising:
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moving at least one radiation source about a system axis;
measuring, using at least one oppositely situated at least single row detector, measures absorption of the radiation, emanating from the radiation source after the penetration of an examination object, the radiation source revolving around the examination object on an imaginary cylindrical surface and in the process scanning the examination object, which lies in a scanning volume formed by the rays, with a beam, the scanning volume being divided into a multiplicity of subvolumes;
using a ray in the beam that is remote from the system axis and whose absorption is used to determine absorption coefficients of the subvolumes penetrated by this ray; and
subsequently, iteratively using rays relatively closer to the system axis and using their measured absorption in order to determine as yet unknown absorption coefficients of as yet unconsidered subvolumes, taking account of already known absorption coefficients of already calculated subvolumes. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 26)
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25. A tomography unit for reconstructing tomograms from detector measured data, comprising:
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at least one radiation source, movable about a system axis;
at least one oppositely situated, at least single row detector that measures the absorption of the radiation, emanating from the radiation source, after penetration of an examination object, wherein at least the radiation source revolves around the examination object on an imaginary cylindrical surface and scans the examination object, which lies in a scanning volume formed by the rays, with a beam; and
means for determining absorption coefficients of subvolumes that are relatively remote from the system axis and subsequently determining absorption coefficients of subvolumes relatively nearer to the system axis, iteratively, taking account of the absorption coefficients already calculated. - View Dependent Claims (27)
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Specification