METHOD TO GENERATE A ATTENUATION MAP OF EMISSION TOMOGRAPHY AND MRI COMBINED IMAGING SYSTEM

摘要

The present invention relates to a photon attenuation map generation method and an MRI fusion imaging system, the photon attenuation map generation method comprising: generating a first sector based photon attenuation map and a first photon attenuation map with respect to each of a plurality of CT images; computing bias by pixel between the first sector based photon attenuation map and the first photon attenuation map with respect to each CT image; generating a sector based photon attenuation average bias map by computing the average of the bias by pixel according to each pixel with respect to each CT image; generating a second sector based photon attenuation map using an MR image of a patient; correcting an attenuation coefficient of each pixel of the second sector based photon attenuation map using the sector based photon attenuation average bias map; and generating a second photon attenuation map using the corrected attenuation coefficient of each pixel. [Reference numerals] (S201) Obtain CT images of individuals;(S202) Non-linear image matching of each individual CT image;(S203) Generate an individual CT image based photon attenuation map;(S204) Generate an individual sector based photon attenuation map;(S205) Generate an individual sector based photon attenuation bias map;(S206) Compute an average of bias at each pixel of the individual sector based photon attenuation bias map;(S207) Generate a sector based photon attenuation average bias map;(S208) Obtain an emission image and an MR image;(S209) Perform sectionalization by dividing the MR image into set segments;(S210) Generate an MR image sector based photon attenuation map by applying a representative attenuation coefficient to each sector;(S211) Correct the attenuation coefficient of the MR image sector based photon attenuation map using the sector based photon attenuation average bias map;(S212) Generate a photon attenuation map of a corresponding patient with the corrected attenuation coefficient