Correction of beam hardening artifacts in microtomography for samples imaged in containers
OwnerJeremy James Holt, Andrew Maurice Kingston +1inventors
InventorsJeremy James Holt, Andrew Maurice Kingston, Adrian Paul Sheppard
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Abstract
Provided are improved referenceless multi-material beam hardening correction methods, with an emphasis on maintaining data quality for real-world imaging of geologic materials with a view towards automation. A referenceless post reconstruction (RPC) correction technique is provided that applies the corrections in integrated attenuation space. A container-only pre-correction technique also is provided to allow automation of the segmentation process required for beam hardening correction methods.
Claims20
A method of correcting tomographic reconstruction for beam hardening, the method comprising:
- (a) reconstructing an initial tomogram from tomographic projection data;
- (b) segmenting the tomogram into two or more phases;
- (c) based on the segmented tomogram, calculating a referenceless post reconstruction correction (RPC) correction in integrated attenuation space;
- (d) applying the RPC correction to tomographic projection data to correct for beam hardening effects;
- and
- (e) reconstructing a final tomogram from the corrected tomographic projection data.
A method of correcting tomographic reconstruction for beam hardening, the method comprising:
- (a) reconstructing an initial tomogram from tomographic projection data;
- (b) applying a container-only pre-correction to the tomogram to correct for beam hardening effects due to a container holding the sample material but not to the sample material itself;
- (c) segmenting the tomogram into two or more phases;
- (d) based on the segmented tomogram, calculating a referenceless post reconstruction correction (RPC) correction;
- (e) applying the RPC correction to tomographic projection data to correct for beam hardening effects;
- and
- (f) reconstructing a final tomogram from the corrected tomographic projection data.
Dependencies are inferred from the claim text.