Correlated Spectroscopic Imaging using Concentrically Circular Echo-Planar Trajectories in Human Calf

Neil Wilson¹, Jon Furuyama¹, Michael Albert Thomas¹

A correlated spectroscopic imaging sequence that traces a circular k-space trajectory is proposed. When using sinusoidal gradients, higher spectral bandwidths can be achieved due to the reduced hardware demands compared to those for trapezoidal gradients. This is crucial for spectroscopic imaging at higher field strengths where higher spectral bandwidth is required to avoid aliasing. Also, less phase encoding steps are needed than for a traditional echo-planar readout, shortening scan times. A human calf was scanned on a Siemens 3T Trio in under 11 min, and 2D spectra from the soleus, tibialis anterior, and marrow are presented.