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Flashcards in Imaging the Film Deck (36)
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1

3 receptor components

1. cassette
2. intensifying screens
3. film

2

Which side of the cassette faces the patient?

Front

3

Which side of the cassette is farthest from the object of interest?

Back

4

What is the 3x7 section of lead used for?

Photo imprinting

5

This aids in converting the x-rays to light after they penetrate the patient
Contain phosphor crystals

Intensifying screens

6

Phosphor Crystals used in intesifying screens that give off blue light and needs blue light sensitive film

Ca Tungstate

7

Phosphor Crystals used in intensifying screens that give off green light and need green light sensitive film

Rare Earth

8

Speed at which the x-rays are converted to light by phosphor

Intrinsic conversion efficiency

9

Conversion efficiency of Ca Tungstate

30-40%

10

Conversion efficiency of Rare Earth

50-60%

11

Life of intensifying screens

15-20 yrs

12

Crystals that fluoresce when x-rays pass through

Phosphors

13

4 layers of the intensifying screens

1. Base
2. Reflective
3. Phosphor
4. Protective

14

Layer of the intensifying screen that is made of plastic/polymer that is virtually indestructible

Base

15

Layer of the intensifying screen that reflects light emitted by phosphor layer back towards the x-ray film

Reflective

16

Layer of the intensifying screen that converts the absorbed x-rays to light

Phosphor

17

Layer of the intensifying screen that is a clear coating on the outer surface of the screen that protects the phosphor layer and reduces static

Protective

18

Intensifying screen speed that has small crystals and provides optimum detail

Slow

19

Intensifying screen speed that has bigger crystals and less detail

Fast

20

What is a disadvantage to using Rare Earth?

$$$$
DOLLA DOLLA BILL

21

Photons of the x-ray beam are converted to light when they reach the emulsion of the screen

Luminescence

22

Instant reaction that lasts exactly as long as the phosphor is stimulated and only give off light when x-rays hit them
Ideal

Fluorescence

23

Phosphor continues to emit light after exposure
Not desirable
AKA "afterglow"

Phosphorescence

24

When a screen ages, it can produce a white, speckled appearance AKA

screen craze

25

4 layers of film

1. Base
2. Adhesive
3. Emulsion
4. Supercoat

26

Layer of film that contains silver halide crystals and gelatin

Emulsion

27

When film is ______, it is vulnerable to scratches.

wet

28

Layer of film that prevents tearing, scratching, and abrasions

Supercoat

29

Image that is formed but not visible

Latent image

30

If you drop an x-ray film, it will _________ from point of impact

streak