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Abstract #0786

Investigation of the effect of eddy current artefacts in UTE-derived PET attenuation maps on PET reconstruction

Andrew Peter Aitken 1 , Charalampous Tsoumpas 1 , Daniel Giese 1 , Sebastian Kozerke 1,2 , Claudia Prieto 1 , and Tobias Schaeffter 1

1 Division of Imaging Sciences and Biomedical Engineering, King's College London, London, London, United Kingdom, 2 Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland

UTE sequences have been used to provide segmented attenuation correction (AC) maps for PET. Such sequences are prone to eddy current artifacts, which lead to deviations from nominal k-space trajectories and to misclassifications in the AC maps. These effects can be corrected for by measuring the true k-space trajectories using a magnetic field camera. In this study the effect of misclassifications on PET reconstruction are investigated using a PET simulation. Uptake in the brain was overestimated by 12.2% when AC-maps derived using nominal k-space trajectories are used, which reduces to 0.34% when AC maps derived from measured trajectories are used.

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