A system provides a single composite image including multiple medical images of a portion of patient anatomy acquired using corresponding multiple different types of imaging device. A display processor generates data representing a single composite display image including, a first image area showing a first image of a portion of patient anatomy acquired using a first type of imaging device, a second image area showing a second image of the portion of patient anatomy acquired using a second type of imaging device different to the first type. The first and second image areas include first and second markers respectively. The first and second markers identify an estimated location of the same corresponding anatomical position in the portion of patient anatomy in the first and second images respectively. A user interface enables a user to move at least one of, (a) the first marker in the first image and (b) the second marker in the second image, to correct the estimated location so the first and second markers identify the same corresponding anatomical position in the portion of patient anatomy.