PET/MRI in the Presence of Metal Implants: Completion of the Attenuation Map from PET Emission Data.

ABSTRACT: We present a novel technique for accurate whole-body attenuation correction in the presence of metallic endoprosthesis, on integrated non-time-of-flight (non-TOF) PET/MRI scanners. The proposed implant PET-based attenuation map completion (IPAC) method performs a joint reconstruction of radioactivity and attenuation from the emission data to determine the position, shape, and linear attenuation coefficient (LAC) of metallic implants. Methods: The initial estimate of the attenuation map was obtained using the MR Dixon method currently available on the Siemens Biograph mMR scanner. The attenuation coefficients in the area of the MR image subjected to metal susceptibility artifacts are then reconstructed from the PET emission data using the IPAC algorithm. The method was tested on 11 s

SUBMITTER: Fuin N 

PROVIDER: S-EPMC5414501 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature