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Radiology I > Film and Screens > Flashcards

Film and Screens Flashcards

1
Q

What are the 3 basic components of film?

A

Base, overcoat, and emulsion

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2
Q

What is the base made of and what is its purpose?

A

Made of plastic, supports the emulsion

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3
Q

What is the overcoat made of and what is its purpose?

A

Made of a non-abrasive gelatin and rptects the emulsion from mechanical damage

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4
Q

The purpose of the emulsion is?

A

Recording

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5
Q

What is the emulsion sensitive to?

A

x-rays and light

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6
Q

Why is emulsion double coated?

A

To increase sensitivity and allow us to use a lower dose

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7
Q

What is the emulsion made of?

A

A homogenous mixture of pure gelatin and silver halide grains

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8
Q

What is used to make the silver halide more sensitive?

A

Gold or sulfur

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9
Q

The silver halide crystals are made of?

A

95% silver bromide and 5% silver iodide

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10
Q

The shape and size of the silver grains determines?

A

The characteristics of the film

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11
Q

How should the crystals be oriented to catch the maximum amount of rays?

A

Parallel to the film surface

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12
Q

Intraoral film is known as?

A

Direct exposure film

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13
Q

What is the advantage and disadvantage to intraoral or direct exposure film?

A

Very sharp images but need a higher dose than indirect

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14
Q

How many sizes does intraoral film come in and what are each of them used for?

A

5 sizes

0-1 for children
2 for standard periapical/bite wing
3 for extended bite wing
4 for occlusal film

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15
Q

What is the advantage to higher speed film?

A

More sensitive and requires lower radiation dosage

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16
Q

Extra oral film is AKA?

A

Screen film

17
Q

What is often used with extra oral film?

A

An intensifying screen

18
Q

What kind of X-rays is extra oral film used for?

A

Panoramic, lateral and postero-antero cephalometrix, skull x-rays

19
Q

What is the point of the lead foil backing?

A

Attenuate the beam and absorbs scattered radiation so it doesn’t strike the emulsion a second time from behind

20
Q

If the film is reversed what will appear?

A

Tire track and low density

21
Q

What is the intensifying screen?

A

A layer of phosphor, fluoresces when X-rays hit it

Radiology I (9 decks)

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