GE Revolution CT User Manual page 286

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Entering a value other than zero off centers the image in the anterior and posterior axes
of the patient.
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Plus <+> can be used for Anterior (A) values and Minus <-> for Posterior (P) values for
faster data entry using the ten key pad.
NOTE: Alternatively, the A/P Center may be set graphically using the X annotation on the
lateral scout image reference lines. Press and hold <Shift>, and then click and drag
the X to center over the area of interest.
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Revolution CT User Manual
Direction 5480385-1EN, Revision 1
4 Scan Parameters