Deck 4: Image Receptors

Question 1

Film fog may be caused by:

A)exhausted processing solutions
B)improper safelight conditions
C)unprotected storage of films
D)all of the above

Answer 1

all of the above

Question 2

The plot of film density versus exposure time is called a (an)___________.

Answer 2

H & D curve

Question 3

Identify the fastest film speed currently available for intraoral radiography:

A)B
B)C
C)E
D)F

Answer 3

F

Question 4

Film-screen imaging systems produce ___________ definition than intraoral film.

Question 5

When the x-ray photons strike the phosphors of the intensifying screen ________ photons are produced.

Question 6

Rare earth intensifying screens differ from calcium tungstate screens in:

A)the cost
B)the amount of light photons generated in the cassette
C)their flexibility
D)the image definition

Question 7

The lead foil backing is included in the intraoral film packet:

A)to absorb back-scattered radiation
B)to help keep the film packet light-tight
C)to hold the film in place
D)to protect the film from saliva

Question 8

Duplicating film:

A)necessitates the use of x-ray photons for exposure
B)does not need safelight conditions
C)has emulsion on both sides
D)has a direct positive emulsion

Question 9

Film speed is determined by:

A)the thickness of the emulsion
B)the presence of radiosensitive dyes
C)the size of the silver halide crystals
D)all of the above

Question 10

The advantage of double-emulsion intraoral films over the old single emulsion films is:

A)more flexibility
B)faster developing time
C)less radiation exposure for the patient
D)increased darkroom illumination

Question 11

A film that has been fogged will have decreased _____________.

Question 12

Taking films to be duplicated out of the mounts:

A)is never necessary
B)makes processing easier
C)improves the detail of the duplicates
D)prolongs the life of the duplicating device

Question 13

Duplicating film does not have an orientation dot on the emulsion to identify the patient's right or left side. Intensifying screens do not have an orientation dot on the screen to identify the patient's right or left side.

A)both statements are true
B)both statements are false
C)the first statement is true;the second statement is false
D)the first statement is false;the second statement is true

Question 14

The main advantage of intensifying screens is:

A)quicker developing
B)less radiation to the patient
C)easier to prepare the cassette
D)better image definition

Question 15

Film cassettes can be either _______ or _______.