Meeting Banner
Abstract #1371

Laterally Oscillating Trajectory for Undersampling Slices (LOTUS)

Mayuri Sothynathan1,2, Paul Dubovan1,2, and Corey Baron1,2
1Department of Medical Biophysics, Western University, London, ON, Canada, 2Centre for Functional and Metabolic Mapping, Western University, London, ON, Canada

Synopsis

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.

Click here for more information on becoming a member.

Keywords