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Abstract #3795

On the Effects of Magnetic Fields Up to 9.4T on PET Image Resolution & Quality Measured with an MR-BrainPET

Nadim Jon Shah1,2, Hidehiro Iida3, Christoph Weirich1, Lutz Tellmann1, Joachim Kaffanke1, Liliana Caldeira4, Elena Rota Kops1, Stefan Spellerberg5, Hans Herzog1

1Institute of Neuroscience & Medicine - 4, Research Centre Jlich, Jlich, Germany; 2Department of Neurology, Faculty of Medicine, JARA, RWTH Aachen University, Aachen, Germany; 3Department of Investigative Radiology, National Cardiovascular Center Research Institute, Osaka; 4Instituto de Biofsica e Engenharia Biomdica, Faculdade de Cincias da Universidade de Lisboa, Lisboa, Spain; 5Institute of Neuroscience & Medicine - 5, Research Centre Jlich, Jlich, Germany

In a hybrid MR-PET system, the magnetic field is expected to reduce the positron range in the x-y plane. The positron range of 18F and 120I was investigated from zero up to 9.4T in a 9.4T human whole-body scanner equipped with a BrainPET insert. The positron range (and thus resolution) of 18F is not affected much by the magnetic field. For the more energetic emitter, I120, there is a significant improvement in resolution at 9.4T.