A method of an optical coherence tomography apparatus for positioning an image of an object on a tomogram comprising: initialising an optical path length of the optical coherence tomography apparatus so that an image of the object can be viewed on the tomogram at an initial position； performing a test move by changing the optical path length in a first direction by a first distance； observing a change in the tomogram of the object as a result of the test move； and determining, from the observation, whether an initial orientation of the image of the object was a normal orientation or an inverted orientation.
