A means for optimizing the tuning and matching of RF coils under different loading conditions without operator intervention. For large high-power coils such as body coils, autotuning involves the adjustment of variable capacitors using electric or hydraulic motors. For low power coils, the tuning elements are most often variable capacitance diodes (varactors) fed by a computer-generated variable voltage.

See Signal Averaging.

A tomographic imaging plane, parallel to the ground, perpendicular (rotated 90°) to the long axis of the human body; the axial plane separates the superior from the inferior part (the head from the feet).
Also called transaxial, transversal, transverse plane.