1. Heart Science Centre, Harefield Hospital, Imperial College, London, United Kingdom.
2. Russell H. Morgan Department of Radiology and Radiological Science, Division of MR Research and Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, Maryland.
3. CMR Unit NHLI, Imperial College, London, United Kingdom.
4. Department of Materials, University of Oxford, Oxford, United Kingdom.Presented as an abstract at the third biennial meeting of the Society for Heart Valve Disease, June 17–20, 2005, Vancouver, Canada.