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Flashcards in 4-7 Deck (33)
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1

Radiolucent

Refers to that portion of the image that is darker or black

2

Radiopaque

Refers the portion of the image that is the light or white

3

Density

Is the degree of darkness or image blackening radiographic image that appears late is said to have little density radiographic image that appears dark is said to be more dense

4

Contrast

Refers to the many shades of gray that separate the dark and light areas

5

Three basic requirements of an acceptable diagnostic radiograph

1.All parts of the structured reporting must be images closes their natural shapes and sizes as the patient's oral and then we will permit (must look like what is in their mouth)
2. Area examined must be imaged completely, and with enough surrounding tissue to distinguish between the structures
3. The radiograph should be free of errors ensure proper density contrast and definition

6

An image with high contrast as usual for the detection and progression of dental caries

T

7

Image with high contrast is useful for detection of periodontal or periapical disease

F low contrast

8

Short scale contrast

Called high contrast, very shades of gray and more black against white 60-70kvp. Great for diagnosing caries (tooth decay) less gray

9

Long scale contrast

Called Low contrast, many shades of gray 8200 KV P. Great for diagnosing periodontal disease long low

10

Direct theory

That cell damage results when ionizing radiation directly hits critical areas within the cell

11

Indirect theory

States the cell damage results indirectly when x-Rays causes the formation of toxins in the cell such as hydrogen peroxide. Toxins in turn cause the cell damage X-ray photons absorbed by the body and form toxins

12

Somatic cell

Any body cells except the reproductive cells

13

Genetic cells

The cells contained within the testes and ovaries consisting the genes

14

Alara concept

As las as reasonably achievable. Adopted as a culture and attitude by professionals who work with ionizing radiation to minimize radiation exposure and risks.

15

Half value

Thickness of a specified material that, when introduced into the path of given beam of radiation, reduces the exposure rate by half

16

Filtration

The use of absorbers for selectively absorbing or screening out low energy X-rays from the primary beam

17

Added filtration

Added to the inherent filtration built into the x-Ray machine. In the form of thin disks of pure aluminum, which can be inserted between the x-Ray tube and the lead collimator when the inherent filtration is not sufficient to meet modern radiation safety requirements

18

Total filtration

The combination of inherent and added filtration in an x-Ray machine. Many states require total filtration of 2.5 of aluminum equivalent for x-Ray machines operating at or above 70 kvp

19

Variation in kilovoltage

Kilovoltage peak controls the quality of the X-ray beam and measure the peak voltage of the current
When voltage peak increase by 15 expose time should decrease by half
When kv decreased, exposure time should be doubled

20

Radio sensitive cells

Cells that are easily harmed by the radiation rapid immature

21

Radioresiatant

Mature cells that don't divide much

22

Put in order high sensitivity to low
A) Red blood cells, b)bone c) never d) muscles e) white f) brain cells g) epithelial h) immature I)connective j)endothelial

White
Red
Immature
Epithelial
Endothelial
Connective
Bone
Never
Brain
Muscle

23

Latent period

Time between exposure to radiation and the first clinically observable symptoms ( hidden)

24

Period of injury

Fallowing Karen period certain effects can be observed

25

Recovery period

Following radiation exposure, some recovery can take place

26

Erythema

Redness of the skin caused by hypermedia of the capillaries in the lower layers of the skin. It occurs with any skin j jury, infection, or inflammation

27

Film speed

The amount of radiation and exposure time needs to rod ice a diagnostic radio graph

28

Maximum permissible dose

Does equivalent of ionizing radiation that is not expected to cause detectable body damage to average persons at any time during their lifetime

29

Maximum accurate dose

Occupationally exposed workers must not exceed an accumulated lifetime radiation dose

30

Base

Transparent base holds the emulsion and give its stiffness