Imaging method and device for the computer-assisted evaluation of computer-tomographic measurements by means of direct iterative reconstruction
First Claim
1. An imaging method for computer-assisted evaluation of projected object trajectories of volume elements, which are obtained from computer-tomographic measurement, wherein the projected object trajectories are stored in a preknown sequence as tracks of respective volume elements and are arranged into a projection matrix and the following steps are iterated until an adequate reconstruction quality has been achieved, the steps comprising:
- storing average values of the tracks representing all elements of the reconstruction matrix into a memory,selecting one or more tracks according to a magnitude of its weight and the magnitude of its contrast with respect to adjacent tracks,forming a positionally-true reconstruction element from the selected one or more tracks including the addition to a reconstruction picture, wherein for forming the positionally-true reconstruction elements of the selected one or more tracks its average value is accumulated with a part of its weight and its contrast,removing the selected one or more tracks from the projection matrix by removing for the selected one or more tracks a portion of the average value of the respective track from the projection matrix, andcontinuing the iteration on the basis of the thus changed projection matrix.
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Abstract
Disclosed are an imaging method and an arrangement for the computer-assisted evaluation of projected object trajectories obtained from a computer-tomographic measurement. According to the inventive method, the trajectories are arranged in a previously known sequence into a projection matrix as traces of the respective voluminous elements, and the following steps are iterated until a sufficient reconstruction quality has been attained; (a) at least one of the traces is selected; (b) a reconstructed element that is true to the original position is formed from each of the selected traces so as to be added to a reconstructed image; (c) the selected traces are removed from the projection matrix.
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Citations
5 Claims
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1. An imaging method for computer-assisted evaluation of projected object trajectories of volume elements, which are obtained from computer-tomographic measurement, wherein the projected object trajectories are stored in a preknown sequence as tracks of respective volume elements and are arranged into a projection matrix and the following steps are iterated until an adequate reconstruction quality has been achieved, the steps comprising:
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storing average values of the tracks representing all elements of the reconstruction matrix into a memory, selecting one or more tracks according to a magnitude of its weight and the magnitude of its contrast with respect to adjacent tracks, forming a positionally-true reconstruction element from the selected one or more tracks including the addition to a reconstruction picture, wherein for forming the positionally-true reconstruction elements of the selected one or more tracks its average value is accumulated with a part of its weight and its contrast, removing the selected one or more tracks from the projection matrix by removing for the selected one or more tracks a portion of the average value of the respective track from the projection matrix, and continuing the iteration on the basis of the thus changed projection matrix. - View Dependent Claims (2, 3, 4, 5)
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Specification