Method of and system for adaptive scatter correction in multi-energy computed tomography

A method of adaptive scatter correction in the absence of scatter detectors for the input projection data in multi-energy X-ray commuted tomography, wherein the input projection data include a set of low energy projections and a set of high energy projections acquired by scanning a set of objects using at least two x-ray spectra, wherein a low-pass filter of variable size is provided, comprising:

• A. Estimating the filter size of the low pass filter as a function of the input projection data;
• B. Computing amounts of scatter in the input projection data using the low-pass filter with the estimated filter size from A, including:
• B1. Exponentiating both sets of projections so as to provide exponentiated projections;
• B2. Filtering the exponentiated projections with the estimated filter size;
• B3. Computing amounts of scatter from the filtered projections;
• and
• C. Correcting the input projection data for the scatter using the amounts of scatter computed from B3.

A system for adaptive scatter correction in the absence of scatter detectors for the input projection data in multi-energy X-ray computed tomography, wherein the input projection data may include a set of low energy projections and a set of high energy projections acquired by scanning a set of objects using at least two x-ray spectra, wherein a low-pass filter of variable size is provided, comprising:

• A. A subsystem constructed and arranged so as to estimate the filter size of the low-pass filter as a function of the input projection data, including:
• A1. A module constructed and arranged so as to threshold one set of projections into binary projections;
• A2. A module constructed and arranged so as to filter the binary projections;
• A3. A module constructed and arranged so as to find maximum of the filtered binary projections;
• A4. A module constructed and arranged so as to calculate the filter size from the maximum found by the module of A3.
• B. A subsystem constructed and arranged so as to compute amounts of scatter in the input projection data using the low-pass filter with the calculated filter size from the module of A4;
• C. A subsystem constructed and arranged so as to correct the input projection data for scatter using the amounts of scatter computed from the subsystem of B.

A system for adaptive scatter correction in the absence of scatter dotectors for the input projection data in multi-energy X-ray computed tomography, wherein the input projection data may include a set of low energy projections and a set of high energy projections acquired by scamming a set of objects using at least two x-ray spectra, wherein a low-pass filter of variable size is provided, comprising:

• A.A subsystem constructed and arranged so as to estimate the filter size of the low-pass filter as a function of the input projection data;
• B. Computing amounts of scatter in the input projection data using the low-pass filter with the estimated filter size from the subsystem of A, including:
• B1. A module constructed and arranged so as to exponentiate both sets of input projection data;
• B2. A module constructed and arranged so as to filter the exponentiated projections with the estimated filter size;
• B3. A module constructed and arranged so as to compute amounts of scatter from the filtered projection data;
• and
• C. A subsystem constructed and arranged so as to correct the input projection data for scatter using the amounts of scatter computed by the module of B3.