Patent ID: 7907698

Claim:
An imaging system comprising: a physiological parameter monitor which monitors a cyclic physiological parameter of a subject in an examination region and generates a cyclic parameter phase indicative signal; a rotatable gantry which rotates around the examination region; a radiation source mounted on the rotatable gantry; a gantry control which controls a rotational speed of the rotatable gantry, the rotational speed being from about 0.5 RPM to about 6 RPM; a radiation detector which detects radiation from the radiation source that has transversed the examination region as the gantry rotates and which detects emission radiation emitted from the subject to generate transmission radiation data and emission radiation data; first and second sorting devices which sort corresponding transmission and emission radiation data into transmission radiation data sets and emission radiation data sets corresponding to each of a plurality of the cyclic parameter phases indicated by the cyclic phase indicative signal; a data processor which reconstructs attenuation maps from the transmission data for each of the plurality of cyclic parameter phases; and an image processor which corrects the emission radiation data of each cyclic parameter phase with the attenuation map of the same cyclic parameter phase and reconstructs the attenuation corrected emission data sets into an image representation for each cyclic parameter phase.