In an embodiment, a tilt calibration system for a medical imaging apparatus having a positioner axis, comprises at least one first sensor (e.g. an accelerometer), configured to determine the position of the positioner axis relative to ground, and at least one second sensor (e.g. an encoder), configured to output tilt position feedback of the positioner axis, and a processor is configured to determine a home offset in response to the position of the positioner axis relative to ground, and the tilt position feedback.