Keywords: New Trajectories & Spatial Encoding Methods, Acquisition Methods
Motivation: Simultaneous multislice (SMS) MRI greatly improves scan efficiency, but there has been little investigation of optimal non-Cartesian trajectories for SMS.
Goal(s): To introduce Laterally Oscillating Trajectory for Undersampling Slices (LOTUS) — a new single-shot spiral-like trajectory for SMS that efficiently covers 3D k-space pseudo-randomly, which may be advantageous for compressed sensing (CS).
Approach: Trajectory performance was assessed using both simulation and in vivo MRI in human participants.
Results: Simulations show reduced errors in CS reconstruction and lower g-factor when using proposed trajectory compared to alternatives. In-vivo results show significantly improved noise variance with high slice accelerations.
Impact: We introduce a k-space trajectory that enables higher slice accelerations compared to traditional approaches, especially compared to Blipped-CAIPI EPI. This may be useful to reduce scan times for advanced diffusion MRI acquisitions or improve temporal resolution of functional MRI.
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