ABSTRACT
Historically done at autopsy, internal documentation of the body by x-rays started soon after their invention by Wilhelm Roentgen in 1896 and the early introduction of this new type of radiation to medicine. Nowadays, a number of different imaging methods are used for internal body documentation. They are all based on one of three basic principles: reection, transmission, or emission (Figure B2.1.1). While reection is used in photography and ultrasound imaging, transmission is the principle of shadow imaging, radiography, and computed tomography, and emission is used in thermography, nuclear medicine, as well as magnetic resonance imaging.
