Himanshu Bhat1, Lan Ge1, Sonia Nielles-Vallespin2, Sven Zuehlsdorff3, Debiao Li1
1Radiology and Biomedical Engineering, Northwestern University, Chicago, IL, United States; 2Cardiovascular MR Unit, Royal Brompton And Harefield NHS Foundation Trust, London, United Kingdom; 3Siemens Medical Solutions USA, Inc., Chicago
Current navigator based free-breathing coronary MRA techniques measure the position of the diaphragm and use a fixed correlation factor to estimate the position of the heart. Such techniques suffer from errors due to the indirect estimation of heart position and are plagued by low scan efficiencies (typically between 30 and 50 %). The purpose of this work was to develop a 3D projection reconstruction (3D PR) based coronary MRA technique which accepts all the data during the scan, irrespective of respiratory position, and retrospectively corrects for respiratory motion by using 3D image registration.