EX2; Radiographic Dentistry and Contrast

Question 1

What kind of light is used to read and see one another

Answer 1

reflected light

Question 2

What kind of light is used to interpret radiographs

Answer 2

transmitted light

films & digital images

Question 3

This is the total light from source such as view box or illuminator

Answer 3

incident light

Question 4

What are three properties of incident light

Answer 4

transmitted
absorbed
reflected

Question 5

What is the most active component of radiographic film

Answer 5

AgBr crystals

Question 6

When exposed to x-rays (or visible light) the AgBr crystals are ionized which after processing is converted to what

Answer 6

metallic silver

Question 7

The greater the amount of radiation that reaches the file, the greater amount of what

Answer 7

metallic silver forming

Question 8

What is the color of metallic silver

Answer 8

black

Question 9

Parts of the film receiving more radiation appear lighter or darker

Answer 9

darker

Question 10

Parts of the film receiving less radiation appear lighter or darker

Answer 10

lighter

Question 11

If we were to process an unexposed film, how would it appear

Answer 11

clear

Question 12

The higher the concentration of trapped electrons, the higher the what

Answer 12

density

Question 13

The lower the concentration of trapped electrons, the lower the what

Answer 13

density

Question 14

This term describes an object less effective in absorbing/blocking/attenuating X-radiation (more radiation is transmitted)

Answer 14

radiolucent

Question 15

What is the chemistry behind radiolucency involving the metallic silver

Answer 15

more X-rays reach the image receptor, more metallic silver forms, trapping electrons, and producing a darker image

Question 16

This term describes an object more effective in absorbing/blocking/attenuating X radiation (less radiation is transmitted)

Answer 16

radiopaque

Question 17

What is the chemistry behind radiopaque involving the metallic silver

Answer 17

less X-rays reach the image receptor, less metallic silver forms, less electrons are trapped, and producing a lighter image

Question 18

This refers to the blackness or darkness of an area of a film

Answer 18

radiographic density

Question 19

What is the range of radiographic density

Answer 19

0.25 (light) to 2.5 (the darkest we can see)

Question 20

This refers to the observed differences in adjoining radiographic densities; difference in densities between light and dark regions

Answer 20

radiographic contrast

Question 21

What does radiographic contract enable us to do

Answer 21

differentiate one structure from another if they differ in density, thickness, and/or chemical composition

Question 22

This type of contrast is if between adjoining radiographic the densities are greater (large differences)

Answer 22

high contrast

Question 23

This type of contrast is if between adjoining radiographic the densities less small (small differences)

Answer 23

low contrast

Question 24

High and low contrast synonymous with what type of scale

Answer 24

high contrast = short scale

low contrast = long scale

Question 25

In referring to the different shades of grey, how many different shades do long and short scales use

Answer 25

short scale = less shades of grey

long scale = more shades of grey