Figure 1.

Procedures for template‐based field map prediction, which consists of two main stages: template generation and field map prediction. The field map template generation is conducted before the experiment. For each subject in the database, (1) the magnitude image of the field map acquisition and the field map are aligned to the T₁‐weighted image and then (2) the aligned field map is warped to standard space by applying the registration transformation from the T₁‐weighted image to the MNI (Montreal Neurological Institute) template. (3) The field map template is obtained by averaging all the warped field maps in standard space. The field map prediction is conducted on the day of scan. (4) When the quick localizer is acquired, it is registered to standard space. Following this, (5) the generated inverse registration is applied to the general field map template to get the estimated field map corresponding to the scanned subject.