Method of and software for conducting motion correction in tomographic scanning and system for tomographic scanning using the method
AssigneeHammersmith Imanet Limited
InventorKris Filip Johan Jules Thielemans
Life of this patent
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Abstract
During data acquisition in a tomographic scan of a subject unscattered events and scatter events are collected. The data are corrected for the scatter events and movement of the subject during the scan. A scatter estimate is derived for use in the reconstruction of an image of the subject; a first step in the derivation has a first dependence on the movement of the subject. The image of the subject is derived from the detected events using the scatter estimate; a second step in this derivation has a second dependence on the movement of the subject, the dependence being different from that of the first step.
Claims22
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.
A method of conducting motion correction for a tomographic scanner including a detector array for detecting radiation from a subject for generating detection data, the method comprising the steps of:
- collecting the detection data and determining movement data representing a time-dependent position of the subject for motion correction,
- characterised in that the method comprises the further steps of:
- deriving a scatter estimate for the non-motion corrected subject and subsequently motion correcting the scatter estimate;
- motion correcting the detection data resulting in motion-corrected data;
- and
- scatter correcting the motion-corrected data using the motion-corrected scatter estimate.
Dependencies are inferred from the claim text.