How often do patients undergo repeat PET or PET/CT examinations? Experience from a UK institution

BACKGROUND AND AIMAccording to the report of the Intercollegiate Standing Committee on Nuclear Medicine, the UK requires 40–60 positron emission tomography (PET) machines in the next decade (Intercollegiate Standing Committee on Nuclear Medicine). Positron Emission Tomographya Strategy for Provision in the UK. LondonRoyal College of Physicians of London; 2003, pp. 1–9). This figure is based mainly on patients receiving only one examination and restricting the clinical indication to three primary diagnoses. The aim of this study was to assess the appropriateness of this figure and the assumptions made in the Intercollegiate report on UK PET provision. METHODSWe examined retrospectively our institutionʼs entire PET and PET/computed tomography (CT) database, which spans 4 years and 9 months. We recorded the number of patients who received repeat examinations. RESULTSReports were available for 3354 PET/CT or PET-only studies; 418 of 2268 patients (18.4%) received at least one repeat PET/CT examination. The three main indications for PET examination in the Intercollegiate report only accounted for approximately 60% of the examinations undertaken. CONCLUSIONOur records suggest that basing the UKʼs future PET provision on a single examination and on three clinical indications only is no longer realistic.