Motion-tracking X-ray CT image processing method and motion-tracking X-ray CT image processing device

摘要

An x-ray CT image processing method which carries out a statistical estimate in prior knowledge relating to the movement and the x-ray absorption coefficient of a measurement subject comprises: a step of hypothesizing that the measurement subject changes smoothly over time, and defining a first probability model (prior knowledge of the measurement subject over all times) relating to movement and a second probability model (projected image observation model over all times) relating to observation; and a step of carrying out a statistical estimate dependent on both the first probability model and the second probability model. The first probability model relating to the movement of the measurement subject and the second model relating to observation are defined as probability models with which statistical estimates are carried out at the outset, and motion and CT images are simultaneously estimated by carrying out induction based on the probability models.

主权项

1. A motion tracking X-ray CT image processing method that sets previous knowledge about an X-ray absorption coefficient of a measuring target and makes statistical estimation, the method comprising:
setting a first probability distribution showing the previous knowledge and setting a second probability distribution showing an X-ray projection image that is most likely to be observed with respect to the X-ray absorption coefficient of the measuring target, the first and second probability distributions being set when the measuring target changes smoothly with time; making statistical estimation depending on both the first and second probability distributions; and reconstructing an image based on the statistical estimation.