Methods and apparatus for three-dimensional and maximum intensity projection image reconstruction in a computed tomography system
First Claim
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1. A system for generating an image of an object using data acquired in a helical scan, said system comprising an x-ray source and a detector array, said system configured to:
- determine a helical weighting function;
determine a standard deviation ratio of reconstructed images with and without helical weighting;
identify a filter coefficient based at least in part on the determined standard deviation ratio; and
apply the identified filter coefficient to the data.
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Abstract
The present invention, in one form, is a system for reducing noise artifacts in three-dimensional image reconstruction using data acquired in a helical scan. More specifically, a standard deviation ratio of reconstructed images with and without helical weighting is identified. Such standard deviation ratio is then used to generate filter coefficients, which are then applied to the data in an adaptive smoothing algorithm.
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Citations
14 Claims
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1. A system for generating an image of an object using data acquired in a helical scan, said system comprising an x-ray source and a detector array, said system configured to:
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determine a helical weighting function; determine a standard deviation ratio of reconstructed images with and without helical weighting; identify a filter coefficient based at least in part on the determined standard deviation ratio; and apply the identified filter coefficient to the data. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for generating an image of an object using data acquired in a helical scan, said method comprising the steps of:
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determining a helical weighting function; determining a standard deviation ratio of reconstructed images with and without helical weighting; identifying a filter coefficient based at least in part on the determined standard deviation ratio; and applying the identified filter coefficient to the data. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification