dental image characteristics

Question 1

radiolucent

Answer 1

radiograph that is dark or black. Lacks density and permits the passage of the x-ray beam with little or no resistance

Question 2

radiopaque

Answer 2

appear white or light on the radiograph, occurs when x-ray cannot pass through the structure and is very dense

Question 3

contrast

Answer 3

ranges from gray - black to white

Question 4

high contrast=

Answer 4

radiograph that has very dark & very light areas

Question 5

90kV

Answer 5

film density increases and radiograph appears darker

Question 6

70 kV

Answer 6

film density decreases

Question 7

long scale

Answer 7

shows many densities, shades of gray.

Question 8

short scale

Answer 8

shows only two densities, areas of black and white

Question 9

Kv decreases=

Answer 9

high contrast= short scale

Question 10

kV increases=

Answer 10

low contrast= long scale

Question 11

consists of the uniform layered thickness of an x-ray absorbing material, usually aluminum. Monitor quality of the film and film processing

Answer 11

step wedge

Question 12

density

Answer 12

overall blackness/darkness of the film

Question 13

density
black spaces=
white spaces=
gray spaces=

Answer 13

black- air spaces
white-enamel, dentin, bone
gray- soft tissue

Question 14

influence on density /contrast
low kV/ mA =
high kV/mA=

Answer 14

low density and high contrast

very high density and very little contrast

Question 15

what do you have to increase that will increase density

Answer 15

kV, mA, exposure time

Question 16

if a patient is thicker, fewer Xrays reach the film, and result an image has

Answer 16

less density and appears lighter

Question 17

penumbra

Answer 17

the fuzzy or blurred area around the image

Question 18

sharpness

Answer 18

Xray receptor to reproduce distinct outlines of an object

Question 19

magnification

Answer 19

the image appears larger than the actual size of the object

Question 20

distance between the object being radiographed and the dental x-ray film

Answer 20

object receptor distance

Question 21

ORD decreases

Answer 21

decrease magnification

Question 22

ORD increases

Answer 22

increase magnification

Question 23

occurs when film is not placed far enough in the center of the mouth and the film must be angulated to avoid the slope of the palate

Answer 23

distortion

Question 24

factors that influence increasing of intensity

Answer 24

increase kVp, mA, time

Question 25

target surface distance=

Answer 25

x-ray to skin

Question 26

target object distance=

Answer 26

x-ray to tooth

Question 27

target receptor distance=

Answer 27

x-ray to film

Question 28

the intensity of radiation is inversely proportional to the square of the distance from the source of radiation

Answer 28

inverse square law

Question 29

source of radiation to the film is increased

Answer 29

the intensity of the beam is decreased