Pedro Ferreira1, Peter Gatehouse2, Peter Kellman3, Chiara Bucciarelli-Ducci2, David Firmin2
1Imperial College London, London, UK; 2Royal Brompton Hospital, London, UK; 3National Institutes of Health, Bethesda, MD, USA
Gibbs ringing is a well known source of Dark Rim Artifacts (DRA) in myocardial perfusion imaging. The visibility of Gibbs DRAs in perfusion studies is very dependent on the position of the subendocardial wall inside the pixel in the absence of zero-filled pre-FFT interpolation. Position variations from frame to frame in a typical gated perfusion study can explain some of the variability often seen in DRAs. Interpolation by zero-filling prior to enlarged FFT regularizes the DRA appearance.