Influence de la densité et du numéro atomique moyen du milieu dans la correction d’atténuation par TDM en TEP : une étude sur fantômes

Results With all three tomographs, the activities estimated on the NAC images present an inverse correlation to the medium density (important absorption by dense material). On CTAC images, we observed with only two of the three tomographs, an overestimation of the activity in the “radioactive” vials, depending on the medium mean Z number and density (over correction), and a artefactual “activity” in the denser “cold” vial (incorrect attenuation correction. The dense saccharose solutions, with non elevated Z number, do not affect the CT attenuation correction.