NOISE SUPPRESSION FOR LOW X-RAY DOSE CONE-BEAM IMAGE RECONSTRUCTION
First Claim
1. A method for digital radiographic 3D volume image reconstruction of a subject, executed at least in part on a computer, comprising:
- obtaining image data at a first examination setting for a plurality of first 2D projection images over a range of scan angles;
generating, for each of the plurality of first 2D projection images, a corresponding second 2D projection image by;
concurrently passing each of the plurality of 2D projection images through a plurality of de-noising filters;
providing a low noise image representation of a different corresponding object;
determining an image data transformation for the first examination setting according to the image representation using outputs of the plurality of de-noising filters and the low noise image representation of a different corresponding object;
applying the image data transformation individually to the plurality of first 2D projection images to generate the corresponding plurality of second 2D projection images; and
storing the plurality of second 2D projection images in a computer-accessible memory.
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Abstract
Embodiments of methods and/or apparatus for 3-D volume image reconstruction of a subject, executed at least in part on a computer for use with a digital radiographic apparatus can obtain image data for 2-D projection images over a range of scan angles. For each of the plurality of projection images, an enhanced projection image can be generated. In embodiments of imaging apparatus, CBCT systems, and methods for operating the same can, through a de-noising application based on a different corresponding object, maintain image reconstruction characteristics (e.g., for a prescribed CBCT examination) while reducing exposure dose, reducing noise or increase a SNR while an exposure setting is unchanged.
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Citations
19 Claims
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1. A method for digital radiographic 3D volume image reconstruction of a subject, executed at least in part on a computer, comprising:
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obtaining image data at a first examination setting for a plurality of first 2D projection images over a range of scan angles; generating, for each of the plurality of first 2D projection images, a corresponding second 2D projection image by; concurrently passing each of the plurality of 2D projection images through a plurality of de-noising filters; providing a low noise image representation of a different corresponding object; determining an image data transformation for the first examination setting according to the image representation using outputs of the plurality of de-noising filters and the low noise image representation of a different corresponding object; applying the image data transformation individually to the plurality of first 2D projection images to generate the corresponding plurality of second 2D projection images; and storing the plurality of second 2D projection images in a computer-accessible memory. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for digital radiographic 3D volume image reconstruction of a subject, executed at least in part on a computer, comprising:
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obtaining cone-beam computed tomography image data at a prescribed exposure setting for a plurality of 2D projection images over a range of scan angles; generating, for each of the plurality of 2D projection images, a lower noise projection image by; (i) providing an image data transformation for the prescribed exposure setting according to image data from a different corresponding subject based on a set of noise-reducing filters; (ii) applying the image data transformation individually to the plurality of 2D projection images obtained by; (a) concurrently passing each of the plurality of 2D projection images through the set of noise-reducing filters; and (b) applying the image data transformation individually to the plurality of first 2D projection images pixel-by-pixel to use the outputs of the set of noise-reducing filters to generate the corresponding plurality of lower noise projection images; and storing the lower noise projection images in a computer-accessible memory.
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18. A digital radiography CBCT imaging system for digital radiographic 3D volume image reconstruction of a subject, comprising:
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a DR detector to obtain a plurality of CBCT 2D projection images over a range of scan angles at a first exposure setting; a computational unit to generate, for each of the plurality of 2D projection images, an reduced-noise 2D projection image, the set of noise-reducing filters to select (i) an image data transformation for a prescribed exposure setting, a corresponding different subject, and a plurality of imaging filters, and (ii) apply the image data transformation individually to the plurality of 2D projection images obtained at the first exposure setting to generate the plurality of reduced-noise 2D projection images; and a processor to store the reduced-noise plurality of 2D projection images in a computer-readable memory. - View Dependent Claims (19)
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Specification