Total SPECT scatter estimation and correction using radiative transfer equation
AssigneeCanon Medical Systems Corporation
InventorsWenyuan Qi, Yujie Lu, Ryo Okuda, Evren Asma, Manabu Teshigawara, Jeffrey Kolthammer
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Abstract
The present disclosure is related to removing scatter from a SPECT scan by utilizing a radiative transfer equation (RTE) method. An attenuation map and emission map are acquired for generating scatter sources maps and scatter on detectors using the RTE method. The estimated scatter on detectors can be removed to produce an image of a SPECT scan with less scatter. Both first-order and multiple-order scatter can be estimated and removed. Additionally, scatter caused by multiple tracers can be determined and removed.
Claims20
An apparatus for reconstructing an image in a single photon emission computed tomography (SPECT) scanner, comprising:
- processing circuitry configured to
- acquire an emission map and an attenuation map, the emission map and the attenuation map each representing an initial image reconstruction of an object of a SPECT scan,
- calculate, using a radiative transfer equation method, a scatter source map of the object of the SPECT scan based on the emission map and the attenuation map,
- estimate scatter using the radiative transfer equation method and based on the scatter source map, the emission map, the attenuation map, and SPECT scanner related information, wherein the SPECT scanner related information includes position information of the SPECT scanner's field of view (FOV), and
- perform image reconstruction of the object based on the estimated scatter and raw data from the SPECT scan of the object.
A method for reconstructing an image in a single photon emission computed tomography (SPECT) scanner, comprising:
- acquiring an emission map and an attenuation map, the emission map and the attenuation map each representing an initial image reconstruction of an object of a SPECT scan;
- calculating, using a radiative transfer equation method, a scatter source map of the object of the SPECT scan based on the emission map and the attenuation map;
- estimating scatter using the radiative transfer equation method and based on the scatter source map, the emission map, the attenuation map, and SPECT scanner related information, wherein the SPECT scanner related information includes position information of the SPECT scanner's field of view (FOV);
- and
- performing image reconstruction of the object based on the estimated scatter and raw data from the SPECT scan of the object.
A non-transitory computer-readable storage medium storing computer-readable instructions that, when executed by a computer, cause the computer to perform a method comprising:
- acquiring an emission map and an attenuation map, the emission map and the attenuation map each representing an initial image reconstruction of an object of a SPECT scan;
- calculating, using a radiative transfer equation method, a scatter source map of the object of the SPECT scan based on the emission map and the attenuation map;
- estimating scatter using the radiative transfer equation method and based on the scatter source map, the emission map, the attenuation map, and SPECT scanner related information, wherein the SPECT scanner related information includes position information of the SPECT scanner's field of view (FOV);
- and
- performing image reconstruction of the object based on the estimated scatter and raw data from the SPECT scan of the object.
Dependencies are inferred from the claim text.