Patent ID: 9645261
Date: 2017-05-09
CPC Classifications: A61B,G01T

Claim:
1. A method for computing normalization coefficients in continuous bed motion acquisition, the method comprising: acquiring, with a positron emission tomography (PET) scanner having a plurality of rings of detectors, line-of-response events from radioactive decay of an isotope in a patient while the patient is moving on a bed at different velocities in the PET scanner; calculating normalization coefficients for the line-of-response events, the normalization coefficients calculated to represent efficiencies for pairs of the detectors, the calculating being a function of a decay correction efficiency for the isotope and step sizes that vary as a function of time in response to the different velocities of the bed; normalizing the line-of-response events as a function of the normalization coefficients; and reconstructing an image of the patient with an output of the normalizing, wherein calculating comprises calculating over time with the step size, Δt, where contribution at a particular time t is:  where λΔt is less than 1, λ is a decay correction constant, t is time, e