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Abstract #3020

Radiotracer dose reduction in 18F-FDG whole-body PET/MR: Effects on image quality and quantification

Maike E. Lindemann1, Vanessa Stebner2, Alexander Tschischka3, Julian Kirchner3, Lale Umutlu4, and Harald H. Quick1,5

1Highfield- and Hybrid MR Imaging, University Hospital Essen, Essen, Germany, 2Department of Nuclear Medicine, University Hospital Essen, Essen, Germany, 3Department of Diagnostic and Interventional Radiology, University Hospital Düsseldorf, Düsseldorf, Germany, 4Department of Diagnostic and Interventional Radiology and Neuroradiology, University Hospital Essen, Essen, Germany, 5Erwin L. Hahn Institute for Magnetic Resonance Imaging, Essen, Germany

The study goal is to investigate how the simulated reduction of injected radiotracer affects PET image quality and quantification in whole-body PET/MR in patients with oncologic findings. PET data of fifty-one patients was reconstructed with 4, 3, 2 and 1 minute/bed time interval. Image quality parameters were analyzed. As expected, the image quality decreases with shorter PET image acquisition times. Besides the two key factors acquisition time and injected activity, the image quality is influenced by the BMI. A lower BMI results in better image quality parameters. 2 minutes acquisition time per bed is sufficient to provide accurate lesion detection.

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