1. A system comprising: a laparoscope configured to capture a laparoscopic image of a surgical field; a laparoscopic ultrasound probe configured to capture an ultrasonic image of a structure in the surgical field; a tracking system configured to detect a position and orientation of said laparoscope and a position and orientation of said laparoscopic ultrasound probe; data associated with said laparoscope wherein said data indicates a distortion in said laparoscopic image; and a computer configured to receive said laparoscopic image, said ultrasonic image and said distortion data associated with said laparoscope wherein said computer is configured to: position and orient said ultrasonic image relative to said laparoscopic image, adjust said ultrasonic image based upon said distortion data, combine said adjusted ultrasonic image with said laparoscopic image, and output said combined images.