Improving Single Shot Acquisitions with Fast Rotary Nonlinear Spatial Encoding
Haifeng Wang 1 , Leo Tam 1 , R. Todd Constable 1 , and Gigi Galiana 1
Department of Diagnostic Radiology, Yale
University, New Haven, CT, United States
Spatial encoding with nonlinear magnetic fields has been
studied recently, such as, O-Space imaging, Null Space
imaging, PatLoc, 4D-RIO, etc. Previous nonlinear
gradient encoding works have explored single shot
trajectories in nonlinear magnetic fields, where the
nonlinear gradients are just aiding the linear encoding.
In this abstract, a scheme of fast rotary nonlinear
spatial encoding, named as FRONSAC imaging, is proposed
to improve highly under-sampled data obtained with
linear gradients by adding nonlinear gradients with low
amplitudes and fast oscillations. The linear gradients
are applied on the three standard linear encoding fields
and the fast rotary gradients are applied on two
second-order encoding fields. Images are reconstructed
by Kaczmarz algorithm. The simulation results illustrate
the proposed scheme can greatly aid many highly
under-sampled linear trajectories, and improve image
quality in accelerated data acquisitions.
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