Deck 12: Screen-Film Radiography

Question 1

The main purpose of the gelatin emulsion in radiographic film is to _____.

A) resist chemical penetration
B) hold the silver halide crystals
C) maintain dimensional stability
D) protect the base

Answer 1

hold the silver halide crystals

Question 2

Photon interactions in the emulsion occur with exposure to _____.

A) x-rays
B) light
C) heat
D) both A and B

Answer 2

both A and B

Question 3

The overcoat on radiographic film is a protective covering of _____.

A) gelatin
B) polyester
C) adhesive
D) cellulose

Answer 3

gelatin

Question 4

A phosphorescent material emits light _____.

A) for a period of time after stimulation
B) only while it is stimulated
C) for less than a nanosecond
D) only from chemical stimulation

Question 5

Film is made with double emulsion to enhance film _____.

A) sensitivity
B) latitude
C) contrast
D) speed

Question 6

Latent image formation occurs during film _____.

A) processing
B) manufacturing
C) storage
D) exposure

Question 7

High contrast film contains _____ silver halide crystals of _____ size.

A) larger, varying
B) larger, uniform
C) smaller, uniform
D) smaller, varying

Question 8

The two basic components of radiographic film are the _____ and the _____.

A) base, adhesive layer
B) base, emulsion
C) emulsion, gelatin
D) emulsion, silver halide

Question 9

The light-emitting efficiency of the intensifying screen is improved by the _____.

A) protective coating
B) reflective layer
C) added dyes
D) phosphor afterglow

Question 10

Photon interactions free the electrons from _____ atoms in the silver halide crystal.

A) bromide
B) iodide
C) silver
D) both A and B

Question 11

The layer of screen that lies closest to the film is the _____.

A) screen base
B) fluorescent layer
C) protective coating
D) reflective layer

Question 12

Crystals in film emulsion consist of _____ and _____.

A) potassium bromide, silver bromide
B) silver nitrate, silver bromide
C) silver bromide, silver iodide
D) silver nitrate, potassium bromide

Question 13

An intensifying screen is an example of _____.

A) luminescence
B) fluorescence
C) phosphorescence
D) both A and B

Question 14

Luminescent material emits light after its outer shell electrons are _____.

A) excited
B) ejected
C) removed
D) any of the above

Question 15

The intensification factor is a measurement of screen _____.

A) resolution
B) speed
C) noise
D) quality

Question 16

The latent image is made up of _____ atoms.

A) bromide
B) silver
C) iodine
D) sulfide

Question 17

A screen that emits light after an exposure terminates is exhibiting _____.

A) conversion efficiency
B) image noise
C) screen lag
D) screen blur

Question 18

The latent image can be seen _____.

A) with a microscope
B) with the naked eye
C) only after development
D) only under red light

Question 19

Screen characteristics are determined by the _____.

A) size of the phosphor crystals
B) thickness of the phosphor layer
C) phosphor composition
D) all of the above

Question 20

A contaminant in the silver halide crystal creates the _____.

A) sensitivity speck
B) latent image
C) manifest image
D) image fog

Question 21

The intensification factor is the exposure required _____ divided by the exposure required _____.

A) with one screen, with two screens
B) with two screens, with one screen
C) without screens, with screens
D) with screens, without screens

Question 22

The intensification factor increases with increased _____.

A) kVp
B) mAs
C) dye
D) temperature

Question 23

Image noise in increased with increased _____.

A) detective quantum efficiency (DQE)
B) conversion efficiency (CE)
C) both A and B
D) none of the above

Question 24

Both the isotropic emission of light from screen phosphor crystals and the added reflective layer contribute to _____.

A) conversion efficiency
B) image blur
C) quantum mottle
D) detective quantum efficiency

Question 25

The ability of an intensifying screen to absorb x-rays is called _____.

A) quantum mottle
B) intensification factor
C) conversion efficiency
D) detective quantum efficiency