1. A body tissue imaging system, comprising: a local imaging device having an imaging pattern for use in generating a local image of the body tissue, the image pattern representing the volume of energy emitted from the local imaging device; a global representation device configured for generating a global representation of the body tissue; and a composite image generator in communication with the global representation device and configured for generating a composite image comprising the global representation and a graphical representation of a shape of the imaging pattern derived independently from the local image.