Patent ID: 7923690
Filing Date: 2011-04-12
Classification: G01T

Abstract:
1. A method of conducting motion correction for a tomographic scanner including a detector array for detecting radiation from a subject to generate detection data, wherein the method comprises: collecting the detection data during a data acquisition period and determining movement data representing a time-dependent position of the subject during the data acquisition period, characterised in that the method comprises a first step of deriving a scatter estimate for use in the reconstruction of an image of the subject, the first step having a first dependence on the movement of the subject, and a second step of deriving the image of the subject from the detection data, the second step having a different, second dependence on the movement of the subject; wherein the data acquisition period comprises long time frames and short time frames, the long time frames and short time frames having different durations determined by the movement, and the first step includes deriving a long time frame scatter estimate and the second step includes motion correction of the detection data collected in a short time frame.