a form of energy carried by waves or a stream of particles
define x-radiation
high energy radiation produced by the collision of a beam of electrons with a metal target in an x-ray tube
define x-ray
abeam of energy that has the power to penetrate substances and record image shows on photograpic film
define radiology
science or study of radiation
define dental radiograph
photographic image produced on film by the passage of x-rays through teeth and related structures
define dental radiographer
any person that positions, exposes, and processes dental x-ray film
6 important reasons for dental radiographs
1detect lesions 2 localize lesions/ foreign objects 3provide info during procedures (rct) 4evaluate growth & development 5 illustrate changes secondary to caries, perio & trauma 6document the condition of pt at specific point in time
discovered x-rays give: name, career, date discovered, object used for 1st film
Wilhelm Roentgen, bavarian physicist, 11/8/1895, wife's hand for 15 min
why did Roentgen give name x-ray
b/c x refers to the unknown as in math
Otto Walkhoff: career, what contribution to dentistry related to x-rays
german dentist, took first dental radiograph on self in 1896- took 25min
Dr. Kells contribution to x-ray technology
credited for first practical use of dental fillms, exposed hands to nemerous x-rays every day for years, lost fingers, hands, then arm
Dr. Rollins contribution to x-ray tech
1901 developed first dental x-ray unit, radiation burn on his arm resulted in study of radiation protection, first wrapped dental film
William Collidge contribute to x-ray tech
electrical engineer developed first hot cathode x-ray tube w/ tungsten filament, first prototype for modern x-ray tubes, hs prototype revolutionezed the generation of x-rays
Victor X-Ray Corp first dental x-ray machine produced in yr/ type
1923 tube head with oil introduced
GE contribution to x-ray unit
1933introduced improved version of Victor X-ray machine immersed in oil, has been little change since then
GE introduces new feature 1957
variable kilovoltage
1966 new feature for tubehead
recessed long-beam tubehead introduced
film hx: 1896-1913
glass photographic plates hand wrapped
film hx: 1913
Kodak introduced pre-wrapped film
film hx: 1920
machine produced pre-wrapped film
technique hx: 1904 technique, improved by dentist in 1925
bisect technique
technique hx: introduced by Kells in 1896, improved in 1920, improved again w/ long cone in 1947
