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. Quick^1,5

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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