Patent ID: 9504431
Filing Date: 2016-11-29
CPC Classification: A61B,G01T

Claim Text:
1. A method of normalizing a sensitivity of a gamma camera, the method comprising: configuring a detector of a gamma camera such that a radioactive point source is positioned within a field of view of the detector at a fixed distance from the detector; performing a planar acquisition of gamma photons emitted by the radioactive point source and passed through a collimator, until a predetermined number of photons have been acquired; computing a system-specific planar sensitivity for a combination of the collimator and detector using the number of gamma photons acquired, a time duration of the acquisition, and precalibrated radioactivity data of the radioactive point source corrected for decay that occurred after a precalibration time; computing a deviation of the computed system-specific planar sensitivity from a class standard sensitivity value for a combination of the radioactive point source, the collimator, and the detector; and scaling a class standard sensitivity value for a combination of a radiopharmaceutical, the collimator, and the detector by the computed deviation, to yield a scaled system-specific sensitivity value for the radiopharmaceutical.