Curtis Nathan Wiens1, Shawn Joseph Kisch2,
Jacob David Willig-Onwuachi3, Charles A. McKenzie1,2
1Department of Physics and Astronomy,
University of Western Ontario, London, Ontario, Canada; 2Department
of Medical Biophysics, University of Western Ontario, London, Ontario,
Canada; 3Department of Physics, Grinnell College, Grinnell, IA,
United States
Existing
approaches for measuring parallel MRI SNR are limited because they are not
applicable to all reconstructions, require significant computation time or
need repeated image acquisitions. A new SNR estimation approach is proposed
that is a hybrid of the two acquisition and multiple pseudo replica methods.
The difference of two pseudo-images is used to estimate the noise in the
acquisition. This gives a
computationally rapid method of measuring SNR from a single acquisition. SNR maps using the two pseudo-image method
were compared to pseudo-replica. All tests of the proposed method were on
average within 1.75%.
Keywords