Patent ID: 8553959

Claim:
A method for correcting multi-modality imaging data, said method comprising: adjusting a tube current of a computed tomography (CT) imaging system to a first tube current value sufficient to generate an attenuation correction map, the first tube current value being less than a second tube current value used to generate diagnostic quality CT images; generating, at the first tube current value, a plurality of computed tomography (CT) projection data using the CT imaging system, wherein the first tube current value has an associated x-ray flux that produces negative values in the CT projection data, preprocessing the CT projection data to generate preprocessed CT projection data; filtering the preprocessed CT projection data to reduce the effect of electronic noise to generate filtered CT projection data; and performing a minus logarithmic operation on the filtered CT projection data to convert the negative values to positive values to generate corrected positron emission tomography (PET) data.