Bone densitometer is used to measure bone density. It can help detect osteoporosis early, or create a baseline that allows identifying patients at high risk. It can also detect osteoporosis before a fracture occurs, predict chances of fractures and determine the rate of bone loss.

Identification. A bone densitometer is a device intended for medical purposes to measure bone density and mineral content by x-ray or gamma ray transmission measurements through the bone and adjacent tissues. This generic type of device may include signal analysis and display equipment, patient and equipment supports, component parts, and accessories.

Classification. Class II.

Camera is a lightproof box or container fitted with a lens, which gathers incoming light and concentrates it so that it can be directed toward the film (in an optical camera) or the imaging device (in a digital camera) contained within. They are made up of the same basic parts a body (the lightproof box), a lens and a shutter to control the amount of light reaching the light-sensitive surface, a viewfinder to frame the scene, and a focusing mechanism. The 35-mm cameras, both rangefinder and reflex models, incorporate a rapid film-transport mechanism, lens interchangeability (whereby lenses of many focal lengths, such as wide-angle and telephoto, may be used with the same camera body), and a built-in light meter. Many also have an automatic exposure device whereby either the shutter speed or the aperture is regulated automatically (by means of a very sophisticated solid-state electronics system) to produce the correct exposure. Accessories include filters, which correct for deficiencies in film sensitivity, flash bulbs and flash mechanisms for supplying light and monopods & tripods for steady support.