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RADT 171 - Phys. 2 > Film > Flashcards

Film Flashcards

1
Q

Provides rigid structure on film imaging

A

Base

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2
Q

“active” layer on film; made with gelatin and silver halide crystals

A

Emulsion

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3
Q

Lowers patient dose, controls screen speed and uses luminescence/fluorescence

A

Intensifying screen

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4
Q

Intensifying screens have ___ layers

A

4; protective coating, phosphor, reflective layer, base

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5
Q

The emission of light when stimulated by radiation

A

Luminescence

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6
Q

The ability of phosphors to only emit light when exposed to x-rays

A

Fluorescence

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7
Q

At what stage does the process of removing unexposed and undeveloped silver halide from the film emulsion occur?

A

Fixing

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8
Q

The front or tube side of radiographic cassettes should be made of a material that:

A

Absorbs very little of the x-ray beam

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9
Q

The greater the film speed, the ______ sensitive it is.

A

more

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10
Q

The greater the film speed, the number of silver halide crystals ______

A

increases

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11
Q

The intensifying screens convert the exit radiation intensities into:

A

visible light

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12
Q

The radiation- and light-sensitive material used in the emulsion of radiographic film is called?

A

Silver halide crystals

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13
Q

What is the correct sequence of film processing?

A

developing, fixing, washing, drying

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14
Q

What is the outermost, durable protection layer of radiographic film called?

A

Supercoat

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15
Q

What is the purpose of the intensifying screen?

A

To reduce the amount of exposure to the patient

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16
Q

What is the term specifically used to emit visible light during x-ray exposure with little or no afterglow?

A

Fluorescence

17
Q

When a film has emulsion coated on both sides of the base versus one side of the base, the film is referred to as:

A

Double-emulsion film

18
Q

Which layer of the intensifying screen is closest to the film and protects the phosphor?

A

Protective layer

19
Q

Which layer of the radiographic film contains crystals suspended in gelatin that serve as the latent imaging centers?

A

Emulsion

20
Q

Which of the following is a major limitation in film-screen imaging?

A

Limited dynamic range

21
Q

According to the Gurney-Mott theory, exposure of the silver bromide crystals in the film emulsion by light or x-ray photons creates the latent image and initiates the conversion process. What completes the conversion process and transforms the image into a permanent visible image?

A

Chemical processing

22
Q

In film, the most important layer is the:

A

Emulsion layer

23
Q

Latent image formation occurs during film ____

A

Exposure

24
Q

What is the first step in film processing?

A

Developer

25
Q

What is the latent image center for radiographic film?

A

Sensitivity speck

26
Q

What describes a film’s sensitivity to light?

A

Speed

27
Q

What chemical agent is responsible for clearing the unexposed silver halide crystals during film processing?

A

Ammonium thiosulfate

28
Q

Why is silver recovery necessary during film processing?
A. It is a natural resource.
B. It is toxic to the environment.
C. It has monetary value.
D. All of the above

A

D

29
Q

What reducing agent acts slowly to produce the higher densities on a film radiograph?

A

Hydroquinone

30
Q

Which automatic processing system primarily maintains the chemical activity level?

A

Replenishment

31
Q

What term is defined as a measure of the amount of light transmitted through the film?

A

OD

32
Q

What is the diagnostic range of optical densities?

A

0.5 to 2.0

33
Q

Changes in radiation exposure have the greatest effect on optical densities in which sensitometric region?

A

straight-line

34
Q

When the exposure technique used produces densities outside the straight-line portion of a sensitometric curve, how was contrast affected?

A

Decreased

35
Q

What do dry imagers use to process the latent image on the film?

A

Heat

RADT 171 - Phys. 2 (10 decks)

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