Method for Subjecting PET Image to Motion Compensation and Attenuation Correction by Using Small Number of Low-Radiation-Dose CT Images

摘要

The present invention relates to a method for motion compensation, and state-of-motion specific attenuation correction of positron tomography images by using a small number of low-radiation-dose computer tomography images. The method of the present invention comprises the steps of: acquiring respiration-specific PET data; acquiring CT images from at least 2 different respirations, and using same to generate a virtual 4D CT image; matching the 4D CT image and the respiration-specific PET data, and selecting 3D CT images accurately corresponding to specific respirations; using the selected results to extract respiration motion displacement field information between respiration-specific PET data; using the selected CT images to subject the respiration-specific PET data to respiration-specific attenuation and scattering correction; and using the corrected respiration-specific PET data items and the extracted respiration motion displacement field information items to carry out respiration compensation and reconstruction.