A method to combine information of respiratory states with a non-rigid motion model is proposed to reconstruct motion-compensated 4D images of dynamic-contrast enhanced MRI with high temporal resolution. Abdominal DCE-GRASP MRI was reconstructed by grouping 4 consecutive spokes as one dynamic frame (0.6sec/frame). Respiratory motion was obtained from central k-space data (as in XD-GRASP). A temporal TV constraint was applied separately for each respiratory state. By using an optical-flow algorithm, four sets of motion vectors were obtained. Motion-compensated GRASP reconstruction was performed by including the motion vectors and showed improved image quality and reduced motion blurring.
How to access this content:
For one year after publication, abstracts and videos are only open to registrants of this annual meeting. Registrants should use their existing login information. Non-registrant access can be purchased via the ISMRM E-Library.
After one year, current ISMRM & ISMRT members get free access to both the abstracts and videos. Non-members and non-registrants must purchase access via the ISMRM E-Library.
After two years, the meeting proceedings (abstracts) are opened to the public and require no login information. Videos remain behind password for access by members, registrants and E-Library customers.
Keywords