System and method for generating a tomographic reconstruction filter
AssigneeKoninklijke Philips N.V.
InventorGilad Shechter
Life of this patent
Estimating the term…
Abstract
A system for generating a reconstruction filter for an imaging scanner comprises a model bank that includes a model for generating the reconstruction filter, a filter criteria bank that includes filter criteria for generating the reconstruction filter, and a filter generator that generates the reconstruction filter based on the filter model and the filter criteria. In one non-limiting instance, the model is based on minimizing a cost function that includes predetermined filter criteria such as image contrast. In another non-limiting instance, the cost function includes terms relating to spatial resolution, noise and a signal visual perception in the presence of noise.
Claims22
A system for generating a reconstruction filter for an imaging scanner, comprising:
- a model bank memory that includes a filter model for generating the reconstruction filter, wherein the filter model includes a cost function including a sum of two terms, including a first term that penalizes a loss of a spatial resolution attributed to the imaging scanner and a second term that penalizes a loss of signal detection due to image noise, wherein the second term is a function of a predetermined signal-to-noise ratio that corresponds to an approximation of a minimal signal-to-noise variance ratio at which a human observer is able to discern a known signal from noise;
- a filter criteria bank memory that includes filter criteria for generating the reconstruction filter;
- and
- a filter generator, executed by a microprocessor, that generates the reconstruction filter based on the filter model and the filter criteria.
A non-transitory computer readable storage medium containing instructions which, when executed by a computer, cause the computer to perform an act of:
- generating a reconstruction filter by minimizing a cost function including only two terms represented as a sum of a first term that penalizes a loss of a spatial resolution attributed to an imaging system and a second term that penalizes a loss of signal detection due to image noise, wherein the second term is based on a predetermined approximation of a minimal signal-to-noise variance ratio at which a human observer is able to discern a known signal from noise.
A method for generating a reconstruction filter for an imaging scanner, comprising:
- obtaining from model memory a filter model that includes a cost function including a sum of two terms, including a first term that penalizes a loss of a spatial resolution attributed to the imaging scanner and a second term that penalizes a loss of signal detection due to image noise, wherein the second term is a function of a predetermined signal-to-noise ratio that corresponds to an approximation of a minimal signal-to-noise variance ratio at which a human observer is able to discern a known signal from noise;
- obtaining from filter criteria memory filter criteria for generating the reconstruction filter;
- and
- with a microprocessor, the reconstruction filter based on the filter model and the filter.
Dependencies are inferred from the claim text.