System and method for controlling zero-count errors in computed tomography
AssigneeWisconsin Alumni Research Foundation
InventorsGuang-Hong Chen, Ke Li
Life of this patent
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Abstract
A system and method for creating computed tomography (CT) images that includes acquiring or accessing CT data of a subject, identifying zero counts in the CT data, and replacing the zero counts in the CT data with at least one non-zero number to create zero-count free CT data. The method also includes estimating a probability function of the zero-count free CT data, removing bias in the zero-count free CT data using the probability function, and reconstructing the zero-count free CT data after removal of the bias to create a corrected image of the subject with preserved conditional independence and spatial resolution.
Claims13
A method for creating computed tomography (CT) images comprising:
- acquiring or accessing CT data of a subject;
- identifying zero counts in the CT data;
- replacing the zero counts in the CT data with at least one non-zero number to create zero-count free CT data;
- estimating a probability function of the zero-count free CT data;
- removing bias in the zero-count free CT data using the probability function;
- and
- reconstructing the zero-count free CT data after removal of the bias to create a corrected image of the subject with preserved conditional independence and spatial resolution.
A method for creating computed tomography (CT) images comprising:
- acquiring or accessing CT data of a subject;
- identifying zero counts in the CT data;
- replacing the zero counts in the CT data with at least one non-zero number to create zero-count free CT data;
- reducing a pre-log bias in the zero-count free CT data introduced by replacing of the zero counts with the at least one non-zero number;
- generating a sinogram estimator;
- reducing a post-log bias in the zero-count free CT data using the sinogram estimator;
- and
- reconstructing the zero-count free CT data after reducing the pre-log bias and the post-log bias to create an image of the subject.
Dependencies are inferred from the claim text.