Holden H. Wu1, Jin Hyung Lee1, Dwight G. Nishimura1
1Electrical Engineering, Stanford University, Stanford, CA, USA
The concentric rings 2D trajectory is inherently centric-ordered, provides smooth weighting in k-space, and enables shorter scan times. These properties make it well suited as a readout trajectory for fast-spin-echo imaging where T2 decay modulates the acquisition. The rings offer a reduction in the number of refocusing pulses, which can be used to reduce the scan time, improve SNR or resolution, or decrease the RF power per TR. In addition, the unique circularly-symmetric sampling nature of the rings enables a time-efficient retracing acquisition for fat/water separation. This allows the rings to be robust to bright fat signal arising from multiple refocusing pulses.