IDEAL fat/water imaging often suffers from estimation errors such as fat/water swaps, which can't be removed even by sophisticated algorithms based on field map smoothness regularization. However, these errors may be minimized by supplying the
algorithms with an adequate FM prior, which, however, is not generally available. We propose a new method to improve IDEAL robustness which exploits a
phenomenon of absence of magnetization transfer (MT) effect in fat for estimation of sufficiently accurate IDEAL field map prior.