Fig. 1

Number of publications from 1985 to 2023 (June) introducing a new technique for attenuation correction for PET-MR data. The pie chart indicates the proportion each group of methods (MR-based, emission-based, Atlas-based and machine learning-based AC) occupies in all literature included in the left plot. For the generation of this figure, the keywords “PET-MR” and “attenuation correction” were used in Google Scholar and PubMed. All results were then filtered to identify studies introducing a new method