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Abstract #3880

Fully-Integrated 3D High-Resolution Multi-Contrast Abdominal PET-MR with High Scan Efficiency

Christoph Kolbitsch1,2, Radhouene Neji3, Matthias Fenchel4, Andrew Mallia2, Paul Marsden2, and Tobias Schaeffter1,2

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

Abdominal PET-MR scans commonly combine free-breathing PET with breathhold or respiratory-triggered MR scans (T1/T2-weighted). This ensures high MR image quality but can lead to PET images impaired by motion blurring. Furthermore, PET can suffer from artefacts close to tissue-lung interfaces due to misalignment of breathhold MR-based attenuation correction (AC) information used for free-breathing PET. Here we present a free-breathing MR-technique which yields motion-compensated 3D T1-weighted and T2-weighted MR images. Respiratory-resolved AC maps and motion compensation improved uptake values (125±131%) and resolution (22±16%). Respiratory motion information is obtained with an accuracy of 1.3±0.1mm without an increase in scan time.

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