To determine the diagnostic accuracy of FDG-PET and hybrid FDG-PET/CT for the detection of patients with suspected post-operative vascular graft infection.

To assess the heterogeneity of the test accuracy by population (for example age, comorbidities, the acquisition time for FDG-PET and hybrid FDG-PET/CT).

To determine the diagnostic accuracy of FDG-PET and hybrid FDG-PET/CT for the detection of patients with suspected post-operative vascular graft infections compared to other commonly used tests such as CT, MRI, ultrasound or 111In or Tc-99 SPECT and SPECT/CT.