Abstract #3880

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

Christoph Kolbitsch^1,2, Radhouene Neji³, Matthias Fenchel⁴, Andrew Mallia², Paul Marsden², and Tobias Schaeffter^1,2

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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