Noise reduction in tomograms
First Claim
1. A method for reducing noise in a tomogram and/or volume rendering of an object, the method comprising:
- receiving a plurality of projection image data records afflicted by stray radiation, based on the plurality of projection image data records afflicted by stray radiation, forming;
(a) at least one tomogram afflicted by stray radiation and having stray radiation artifacts, and(b) at least one preliminary tomogram corrected with respect to stray radiation by a predetermined correction method,using a filter to selectively smooth (a) noise in the at least one tomogram corrected in terms of stray radiation or (b) noise in an artifact map describing the stray radiation artifacts, based on an edge profile of the object imaged in the tomogram afflicted by stray radiation, andsmoothing the noise in the at least one tomogram corrected in terms of stray radiation in a region-specific manner by an adaptive filter in a manner dependent on the edge profile.
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Abstract
A method is provided for reducing noise in a tomogram and/or volume rendering of at least one object. The noise can occur when scattered radiation artifacts are corrected. At least one tomogram that is affected by scattered radiation and at least one preliminary tomogram that has been corrected by a defined correction method are produced from a plurality of projection image datasets that are affected by scattered radiation. The noise emerging when scattered radiation artifacts are corrected may be reduced by selectively smoothening the noise using a filter based on an edge contour of the at least one object, which contour is rendered in the tomogram that is affected by scattered radiation.
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Citations
13 Claims
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1. A method for reducing noise in a tomogram and/or volume rendering of an object, the method comprising:
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receiving a plurality of projection image data records afflicted by stray radiation, based on the plurality of projection image data records afflicted by stray radiation, forming; (a) at least one tomogram afflicted by stray radiation and having stray radiation artifacts, and (b) at least one preliminary tomogram corrected with respect to stray radiation by a predetermined correction method, using a filter to selectively smooth (a) noise in the at least one tomogram corrected in terms of stray radiation or (b) noise in an artifact map describing the stray radiation artifacts, based on an edge profile of the object imaged in the tomogram afflicted by stray radiation, and smoothing the noise in the at least one tomogram corrected in terms of stray radiation in a region-specific manner by an adaptive filter in a manner dependent on the edge profile. - View Dependent Claims (2, 3)
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4. A method for reducing noise in a tomogram and/or volume rendering of an object, the method comprising:
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receiving a plurality of projection image data records afflicted by stray radiation, based on the plurality of projection image data records afflicted by stray radiation, forming; (a) at least one tomogram afflicted by stray radiation and having stray radiation artifacts, and (b) at least one preliminary tomogram corrected with respect to stray radiation by a predetermined correction method, using a filter to selectively smooth (a) noise in the at least one tomogram corrected in terms of stray radiation or (b) noise in an artifact map describing the stray radiation artifacts, based on an edge profile of the object imaged in the tomogram afflicted by stray radiation, and forming the artifact map based on the tomogram afflicted by radiation and the tomogram corrected in terms of stray radiation, and smoothing the noise in the artifact map. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 13)
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12. A computed tomography scanner, comprising:
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a ray source configured to pass radiation through an object from different projection angles; a ray detector configured to detect the rays and produce a plurality of projection image data records of the trans-illuminated object; and an analysis device configured to form, based on the plurality of projection image data records detected by the ray detector; (a) at least one tomogram afflicted by stray radiation and having stray radiation artifacts, and (b) at least one preliminary tomogram corrected with respect to stray radiation by a predetermined correction method, use a filter to selectively smooth (a) noise in the at least one tomogram corrected in terms of stray radiation or (b) noise in an artifact map describing the stray radiation artifacts, based on an edge profile of the object imaged in the tomogram afflicted by stray radiation, forming the artifact map based on the tomogram afflicted by radiation and the tomogram corrected in terms of stray radiation, and smoothing the noise in the artifact map.
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Specification