MR Spectroscopic Imaging Using a Concentric Rings Trajectory

Holden H. Wu¹, Jin Hyung Lee¹, Dwight G. Nishimura¹

In this work, we propose the use of a concentric rings readout trajectory for MR spectroscopic imaging (MRSI). The unique circularly symmetric sampling nature of concentric rings enables a time-efficient retracing acquisition to simultaneously encode spatial and spectral information. This acquisition design maximizes the readout duty cycle by continuously retracing each ring with no sampling dead time. MRSI using concentric rings offers a scan time advantage over conventional MRSI, while also demonstrating robustness to eddy currents, timing errors, and gradient delays. Experimental results from an imaging phantom are presented.