Patent ID: 7324624
Filing Date: 2008-01-29
Classification: G01T

Abstract:
1. A computer implemented method of performing a transmission scan of a patient while the patient is emitting radiation, and correcting the transmission scan for emission contamination from the patient, the method comprising: transmitting gamma rays into the patient from a collimated point source, and moving the collimated point source axially and circumferentially with respect to the patient, while detecting at a gamma detector gamma rays transmitted from the collimated point source through the patient and gamma rays emitted from the patient; sorting gamma ray detection events from the gamma detector into transmission events detected over an axial beamwidth of the collimated point source over the gamma detector and emission contamination events detected is over an axial region of the gamma detector axially separated and axially displaced from the axial beamwidth of the collimated point source over the gamma detector; and correcting the transmission events detected over the axial beamwidth of the collimated point source over the gamma detector with the emission contamination events detected over the axial region of the gamma detector axially separated and axially displaced from the axial beamwidth of the collimated point source over the gamma detector.