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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