Motivation: Develop a spatiotemporal encoding method which can flexibly change FOV without aliasing in an inhomogeneous magnetic field for single sided MRI. Goal(s): Develop a comprehensive protocol with a fully 3D, cross-term spatiotemporal encoding (xSPEN) pulse sequence and associated reconstruction for a single sided scanner with inhomogeneous B0 and B1 fields. Approach: Use a RARE (Rapid Acquisition with Relaxation Enhancement) radial xSPEN sequence to rapidly collect profiles of the subject along in-plane angles and slices, and apply a radon-based inversion calculation for reconstruction. Results: Images with no Fourier encoding were produced and could be reconstructed to a higher resolution without aliasing. Impact: This method is applicable for 3D imaging in an inhomogeneous magnetic field at higher resolution compared to traditional Fourier encoding by cropping the FOV without aliasing.
Jin et al. (Tue,) studied this question.