a process for producing an image of a single plane of an object excluding all other planes, as by using CT scan or ultrasound, in diagnostic medicine, seismic surveys, etc.
See tomography in American Heritage Dictionary 4
(tō-mŏgˈrə-fē)
noun
Any of several techniques for making detailed x-rays of a predetermined plane section of a solid object while blurring out the images of other planes.