Quantitative analysis of the effect of the magnetic field generated by a PET/MR scanner on positron range.

Objective: Image quality in positron emission tomography (PET) is influenced by positron range. In this work, the effect of the magnetic field of a PET/MR Siemens Biograph mMR 3T on the quality of PET images was studied.

Approach: Experimental measurements were conducted usingF andGa-filled phantoms to quantify image uniformity, recovery coefficients (RCs), spill-over ratios and percent contrast for spherical lesions.