Odds for Radiographic Test Friday, 4th

Question 1

The immediate emission of light during stimulation is characteristic of

Answer 1

fluorescent phosphor

Question 2

Film speed can be increased by

Answer 2

increasing crystal size and increasing emulsion thickness

Question 3

As the speed of a film screen system increases

Answer 3

image resolution decreases, quantum mottle increases, and noise increases

Question 4

The resolution of an intensifying screen can be improved by

Answer 4

using light-absorbing dyes

Question 5

Poor film screen contact is more prevalent with

Answer 5

large cassettes

Question 6

The image on the radiographic film after exposure but before development is

Answer 6

latent image

Question 7

If numerous negative density “white” artifacts are observed on a radiographic image, which actions should be taken?

Answer 7

clean the intensifying screen with appropriate solution

Question 8

The use of intensifying screens will

Answer 8

reduce radiographic exposure and reduce patient exposure

Question 9

The emulsion of a non-screen film is thicker than the emulsion of a screen film.

Answer 9

True

Question 10

The purpose of the felt cushion in the cassette is

Answer 10

to improve film-screen contact

Question 11

Which of the following is a requirement in the construction of the cassette front?

Answer 11

must be radiolucent

Question 12

Film should be stored in a ____ ____ environment.

Answer 12

cool dry

Question 13

Which type of illumination is desirable in an intensifying screen?

Answer 13

fluorescence

Question 14

The property of certain chemicals to absorb radiation and emit light is

Answer 14

luminescence

Question 15

What part of the intensifying screen intercepts light photons going in various directions and redirects them to the film?

Answer 15

reflective layer

Question 16

List and explain the 4 characteristics a material should have to be used as a phosphor in an intensifying screen.

Answer 16

conversion efficiency, DQE, afterglow, spectral matching

Question 17

conversion efficiency

Answer 17

convert more x-ray to more light

Question 18

DQE

Answer 18

increases Z# to increase absorption efficiency

Question 19

afterglow

Answer 19

should only fluoresce, not phosphorous

Question 20

spectral matching

Answer 20

correct color of light from screen to match sensitivity of film

Question 21

Screens with a thick active layer will display higher speed and greater detail than screens with a thinner active layer.

Answer 21

False

Question 22

Screens should be cleaned with a mild detergent and paper towel.

Answer 22

False

Question 23

gadolinium, lanthanum, yttrium

Answer 23

rare earth phosphors

Question 24

Which of the following are components of radiographic film?

Answer 24

emulsion, polyester base, silver halide crystals

Question 25

latent image

Answer 25

the image on the radiographic film after exposure but before development

Question 26

orthochromatic film

Answer 26

sensitive to yellow-green light, red light is used during exposure

Question 27

panchromatic film

Answer 27

sensitive to all color lights, no light is used during exposure

Question 28

conversion efficiency

Answer 28

is where the phosphor should emit a large amount of light per x-ray absorption

Question 29

absorption efficiency

Answer 29

a high Z# in the phosphor so that x-ray absorption is high

Question 30

crossover

Answer 30

is when light goes through the top emulsion, through the base, and to the bottom emulsion. it affects recorded detail, due to the spreading of detail