Film Screen Review Questions
According to the Gurney-Mott theory, the incident photon interacts with one of the halide crystals and ejects a/an: a. electron b. light photon c. sensitivity speck d. x-ray photon
a
As film speed increases, sharpness of detail: a. decreases b. increases
a
As the emulsion layer increases, the film speed increases. a. true b. false
a
Film latitude is the "forgiving" characteristic in the emulsion that gives you leeway in your technical factors. a. true b. false
a
Mismatching of film and screen often increases patient dose. a. true b. false
a
Silver halide crystals are mainly comprised of silver __________. a. bromide b. iodide
a
The predominant phosphor used in intensifying screens is the rare-earth phosphor. a. true b. false
a
What is the proper mAs for use with a 400 RS system when technical factors of 91 kVp and 26 mAs produce an acceptable image with a 100 RS system? a. 6.5 mAs b. 65 mAs c. 10.4 mAs d. 104 mAs
a
What percentage of the film is exposed directly by x-rays? a. 1% b. 50% c. 99% d. 20%
a
Place the following steps in radiographic film/screen system image formation in correct order. a. Resulting Silver grain creates radiographic image b. Electron moves to sensitivity center c. Chemical processing converts remaining halide to metallic silver d. Xray releases electron(s) e. Atomic (metallic) silver is formed at sensitivity center f. Silver builds up at sensitivity center g. Process repeats many times
a) 7 b) 2 c) 6 d) 1 e) 3 f) 5 g) 4
A nonscreen radiograph of a shoulder examination results in a skin entrance exposure 150 mR; a screen radiograph of a knee achieving a similar density results in a skin entrance exposure of 15 mR. What is the intensification factor of the film/screen combination? a. 5 b. 10 c. 15 d. 20
b
As crystal size increases, film speed decreases. a. true b. false
b
As emulsion thickness increases, speed: a. decreases b. increases
b
The unseen change in the atomic structure of the crystal lattice in the emulsion is called the ____ image. a. phantom b. latent c. visible d. invisible
b
What information, located on each box of film, is important to note and has a direct relationship to film quality? a. emulsion lot b. number of films per box c. expiration date d. manufacturer's name
c
What is the proper mAs for use with a 100 RS system when technical factors of 73 kVp and 100 mAs produce an acceptable image with a 200 RS system? a. 20 mAs b. 100 mAs c. 200 mAs d. 400 mAs
c
Intensifying screens are used to a. reduce patient radiation dose. b. produce light photons. c. amplify the incoming x-ray beam. d. all of the above
d
Radiographic film should be stored a. at a temperature below 68ºF. b. in 30 to 60 percent humidity. c. on end. d. all of the above
d
The two basic components of radiographic film are the _____ and the _____. a. base, adhesive layer b. emulsion, gelatin c. emulsion, silver halide d. base, emulsion
d
