1. Radiographic Contrast and Density Flashcards

1
Q

Radiographic Density also known as

A

optical density, photographic density, or film density

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2
Q

a measure of the degree of film darkening

A

Radiographic Density

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3
Q

the degree of darkness

A

Radiographic Density

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4
Q

the degree of density difference between

two areas on a radiograph

A

Radiographic Contrast

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5
Q

difference between those x-rays absorbed and those transmitted to the IR (image receptor)

A

Differential Absorption

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6
Q

the most important characteristic of a radiograph

A

Technical balance

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7
Q

In a radiographic sense, balance is the relationship between ______, ______, and ______

A

contrast, density, and sharpness

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8
Q

abrupt density differences

A

Short scale contrast

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9
Q

subtle details can be missed

A

Short scale contrast

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10
Q

produce visibility of detail

A

variations in density (contrast)

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11
Q

2 Major Elements that Make up Radiographic Contrast

A

Subject Contrast and Film Contrast

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12
Q

is the amount of differential absorption that has taken place among the various body structures lying in the path of the x-ray beam

A

Subject Contrast

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13
Q

Image Receptors (IR) can either be ______ or _______

A

Film Cassettes, CR IP (Computerized Radiography Imaging Plates)

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14
Q

one element that remains constant and will determine radiographic contrast

A

Differential Absorption of Subject Contrast

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15
Q

denotes the inherent sensitivity a given emulsion has to variations in the intensity of remnant photons striking its surface

A

Film Contrast

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16
Q

Harmony must exist between ____ and ____ before a good radiographic result can be gained

A

Film and Subject Contrast

17
Q

durable protection layer

A

Super coat

18
Q

contains the black metallic silver,

radiation and light-sensitive layer

19
Q

adheres layers together

20
Q

polyester layer that gives the film physical stability

21
Q

made of mixture of gelatin and silver halide crystals (fluorine, chlorine, bromine and iodine)

A

Film Emulsion

22
Q

most of x-ray film emulsions are made of:

A

Silver Bromide (90%), Silver Iodine (10%)

23
Q

activated by light and radiation to create image

A

Photographically active layer

24
Q

the degree of blackness over the area being viewed

A

Radiographic density

25
the third major characteristic
Sharpness or Definition
26
the radiographic image has 2 types of detail:
Visibility of detail, Sharpness of detail
27
how well we can see the structures that have been transferred to the film’s emulsion by the quantity and variation of remnant photons.
Visibility of detail
28
The more pronounced/noticeable these absorption differences are, the ______ the subject contrast will be.
greater
29
Other things remaining constant, the _______________ will determine radiographic contrast.
degree of differential absorption (subject contrast)
30
Assuming all factors are held constant – as subject contrast is increased, radiographic contrast will ______.
increase
31
There must be an overall ______ present in the radiographic | image to produce optimal detail visualization
Density
32
It is obtained when a sufficient accumulation of black metallic silver crystals is present in the film
Density
33
The accumulation of silver is directly related to the number of _________ that struck the film during an exposure
remnant photons
34
if a small number of x-ray photons strike the film, the accumulation of black silver crystals will be ____ and when the film is placed on the x-ray illuminator, the eye will have great _____ seeing the intended detail
sparse, | difficulty
35
If a remnant beam is sufficiently intense, the overall accumulation of silver would be ______ along with associated detail.
evident
36
The film’s inherent ability to emphasize intensities of the remnant beam will determine _________
Radiographic Contrast