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Abstract #0879

Respiratory Resolved Attenuation Correction Maps for Motion Compensated PET-MR using Dixon-GRPE

Christoph Kolbitsch1,2, Radhouene Neji3, Matthias Fenchel4, and Tobias Schaeffter1,2

1Division of Imaging Sciences and Biomedical Engineering, King's College London, London, United Kingdom, 2Physikalisch-Technische Bundesanstalt (PTB), Braunschweig and Berlin, Germany, 3MR Research Collaborations, Siemens Healthcare, Frimley, United Kingdom, 4MR Oncology Application Development, Siemens Healthcare, Erlangen, Germany

Quantitative PET requires accurate attenuation correction (AC) information. For simultaneous PET-MR acquisitions in the thorax or abdomen these MRAC images are obtained in a single breathhold which can lead to misregistration errors between breathhold MRAC and free-breathing PET data. Here we present a method which obtains accurate AC information (Dice coefficient higher than 0.85) during free-breathing and yields additional respiratory motion fields which can be utilised in motion-compensated MR and PET reconstructions. The proposed Dixon-GRPE method led to improvements of up to 50% in sharpness (FWHM) and a 33% improvement in the quantification of the specific uptake value (SUV).

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