PURPOSE: An EFOMP Working Group (WG) was created in 2020 to establish recommendations for PET/CT/MRI Quality Control (QC). The WG's intention was to create a document containing a set of measurements suitable for routine practice. In order to map the current situation in PET facilities, the WG prepared a survey addressed to European Medical Physics Experts (MPE). METHODS: The survey was conducted using an electronic questionnaire with 10 sections, for a total of 43 multiple choice or open questions. Data regarding general information, model of installed scanners, contract of maintenance and phantoms available were collected. The focal part of the questionnaire concerned the QC protocol adopted and accreditation programs. RESULTS: 123 answers from 24 countries were collected. 90.2% of the respondents are affiliated as staff MPEs; 45% have non-digital TOF PET/CT scanners with a contract of maintenance (97.6%). In 98.4% and 86.8% of responding centres a sealed source for daily QC and the NEMA Image Quality Phantom were present. 94.3% of respondents perform daily QC according to manufacturer recommendations, while NEMA Tests are not performed routinely (51.2%). 56.1% of the respondents have scanners accredited by a national or international organization. 56% of the centres perform annual CT tests, while more than 90% do not perform any MRI QCs. CONCLUSIONS: The results of the survey show that there is a lack of harmonization in the PET QC procedures across Europe. The information obtained will guide the WG in proposing a guideline containing a set of measurements suitable for the clinical routine.

Department of Medical Physics and Radiation Protection University Hospital Olomouc Olomouc Czech Republic

King's College London and Guy's and St Thomas' PET Centre School of Biomedical Engineering and Imaging Sciences King's College London King's Health Partners London UK

Medical Image and Signal Processing Ghent University Belgium

Medical Physics Department Institut Català d'Oncologia L'Hospitalet de Llobregat Barcelona Spain

Medical Physics Department Veneto Institute of Oncology IOV IRCCS Padua Italy

Radiology and Nuclear Medicine Amsterdam UMC location VUMC Amsterdam The Netherlands

Sorbonne Université AP HP Hôpitaux Universitaires Pitié Salpêtrière Charles Foix Service de Médecine Nucléaire and LIB INSERM U1146 Paris France

University Hospital Maggiore della Carità Novara Italy

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