Jennifer Keegan1, Permi Jhooti2, Peter Drivas1, Sonya Babu-Narayan1, David Firmin1, 3
1Cardiovascular Magnetic Resonance, Royal Brompton Hospital, London, United Kingdom; 2Radiological Physics, University Hospital Basel, Basel, Switzerland; 3Imperial College, London, United Kingdom
Free-breathing late gadolium enhancement (LGE) studies are generally performed with diaphragmatic navigator gating which is inherently inefficient, particularly in the presence of respiratory drift. While the continuously adaptive windowing strategy (CLAWS) is highly efficient, changing the order of k-space coverage in response to the diaphragm position during gadolinium wash-out may potentially result in artefacts. We acquired CLAWS and end-expiratory accept/reject (EE-ARA) navigator gated 3D LGE studies in six patients. The respiratory efficiency was significantly higher for the CLAWS acquisitions and no k-space order related artefacts were seen. CLAWS is a suitable method of respiratory motion control free-breathing 3D LGE acquisitions.