Meeting Banner
Abstract #2812

Hardware Attenuation Correction in PET/MR Hybrid Imaging: Evaluation of -Maps for Local RF Coils

Daniel H. Paulus1, Harald Braun1, Harald H. Quick1

1Institute of Medical Physics, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany

In hybrid PET/MR imaging local receiving RF coils, placed in the FOV, attenuate and scatter PET annihilation photons thus affecting PET quantification. Flexible RF surface coils are yet omitted in PET attenuation correction (AC), because they can vary in position and geometry. Several CT-based attenuation maps (-map) of the RF coil were used for PET AC to evaluate the effect of different parameters. Furthermore small shifts and rotations of the -map simulating misregistration or motion of the patient were analyzed. Depending on the PET reconstruction algorithm the shifts can cause artifacts or just a bias of the activity concentration.

Abstract PDF Poster PDF

Keywords

according activity analyze annihilation another apply around artifacts attenuate attenuation audience away axis background become besides bigger biograph block body breathing channel coil coils compensated concentration conversion correct correction corrects cutting decreases depend determine deviate deviation devices directly disregarding edges electronic electronics emission especially evaluate even extended field filter filtered fixed flash flexible generated generation geometry glass hardware human hybrid important influence inherently inside investigation iterations just known lead leads lesion liters local loss many maps markers materials mimicking misplaced misplacement modified much near noise none note omitted optimized outside overall overcorrection overestimation parts patient phantom phys physicians physics placed position positioned post processing project prone quick quite real receive receiving reconstruction reduced reduces related replaced rotation rotations scale scaling scanned sector segmentation sensitivity setup several sharp simulate simultaneously since slice slightly spheres spotlight studies subsets surface system table target threshold topic upper usually vary view visible volume water whole width