In Vivo O-Space Imaging with a Dedicated 12 Cm Z2 Insert Coil on a Human 3T Scanner Using Phase Map Calibration

Jason Stockmann¹, Gigi Galiana², Leo Tam¹, Christoph Juchem², Terence Nixon², Robert Todd Constable, ¹²

We present the first accelerated in vivo "O-Space" images acquired using a quadratic gradient insert coil in combination with conventional linear gradients. We achieve a highly accurate calibration by using phase encoding to map the spin phase in each voxel at every readout point of the O-Space pulse sequence, accounting for effects of field strength, timing, concomitant fields, and eddy currents. O-Space images compare favorably to under-sampled radial and Cartesian images at high acceleration factors using only 8 receive coils. This work paves the way for more in-depth future investigation of projection imaging with nonlinear encoding fields.