Lecture 6

Question 0

What is the degree of blackness on a radiograph dependent on

Answer 0

The amount of x-rays reaching the film

Question 1

If there’s no patient between the film and the x-ray beam what color will the film be

Answer 1

Black

Question 2

What is the emulsion layer of the film

Answer 2

Contains silver hollered crystals suspended and disbursed evenly throughout the layer. On both sides to increase film sensitivity, speed, density, contrast

Question 3

When the film is developed in developer solution the sensitized silver will be converted to what on the x-ray film after processing

Answer 3

Dark black dots

Question 4

If there is an object between the x-ray beam and the film, exposing the film to radiation will create a what image because not all x-rays will reach the film

Answer 4

Latent

Question 5

After producing the film the latent image will be converted to what

Answer 5

2-D image

Question 6

What is MA used for

Answer 6

To control the quality of x-rays produced by the x-ray beam. When MA is increased a higher number of x-rays are generated

Question 7

What is the length of exposure time

Answer 7

The period of time during which the x-rays are permitted to leave the x-ray tube.

Question 8

What is the general exposure time for dogs at Vanier

Answer 8

1/24

Question 9

What is the general exposure time for cats at vanier

Answer 9

1/30

Question 10

What does the MAS describes

Answer 10

The total quantity of x-rays produced by the x-ray tube at a given time.

Question 11

What is the KV P

Answer 11

Amount of electrical energy being applied to the anode and cathode to accelerate the radiation from the cathode toward the target

Question 12

What happens when KV P is increased

Answer 12

The penetrating power of x-ray through tissue is increased

Question 13

What are the three things that radiographic quality is dependent on

Answer 13

Radiographic density, radiographic contrast, radiographic detail

Question 14

What is radiographic density

Answer 14

The degree of blackness on a radiograph.

Question 15

What can the radiographic density be increased by

Answer 15

Increasing the MAS, increasing the KV P

Question 16

What is radiographic density also influenced by

Answer 16

Thickness and type of tissue

Question 17

Tissues. That have higher density absorb more x-rays and result in what color

Answer 17

White or light image

Question 18

What can you say about bones and x-rays in terms of density and contrast

Answer 18

They have a high density. But decrease the radiographic density. They are high contrast

Question 19

What is radiographic contrast

Answer 19

The difference in density between two adjacent areas on a radiographic image

Question 20

What is low contrast

Answer 20

Long scale of contrast. Many shades of gray

Question 21

What is a high contrast

Answer 21

Short scale of contrast. Few shades of gray. Ex: bones

Question 22

What is radiographic contrast affected by

Answer 22

Subject density, KV P level, scatter radiation, film fogging

Question 23

What is the definition of subject density in relation with radiographic contrast

Answer 23

The ability of the different tissue density us to absorb x-rays. Xers penetrate the various tissues depending on differences in atomic number and thickness

Question 24

What happens when you increase subject density

Answer 24

Will increase radiographic contrast.

Question 25

What can High KVP produce

Answer 25

A low curling trust radiograph. The higher the KV P, the longer the scale of contrast.

Question 26

What happens with low KVP

Answer 26

Produces a high contrast radiograph with a short scale of contrast.

Question 27

What anatomical regions require a high KVP setting

Answer 27

Thorax and abdomen

Question 28

What anatomical regions require low KVP setting

Answer 28

Bones

Question 29

What is scatter radiation

Answer 29

Radiation produced when x-rays from primary beam collide with objects in its path, I merge in all different directions.

Question 30

Why is scatter radiation undesirable

Answer 30

Fogs the film, contrast is decreased, you are exposed to radiation

Question 31

Why does high KV P produce more scatter radiation

Answer 31

Controls penetrating power of x-rays so more x-rays get through patient and through the film

Question 32

What is an important beam limiting device

Answer 32

Collimators or grids

Question 33

What are the causes of film fogging

Answer 33

Leaks in darkroom, scatter radiation, heat, improper processing

Question 34

What is a grid

Answer 34

Device placed between patient and film to absorb scatter radiation and improve image quality

Question 35

What is a Bucky

Answer 35

Device placed under the x-ray table that moves the grid back-and-forth. Placed in the cabinet beneath x-ray table with a trade to hold cassette. Decreases or eliminates white gridlines on radiograph

Question 36

What is Geo metric unsharpness due to

Answer 36

Patient motion, long exposure time

Question 37

How do you prevent geometric unsharpness

Answer 37

Have shortest possible exposure time

Question 38

What is foreshortening

Answer 38

When image seems smaller than really is not parallel to recording surface. Subject must be parallel to photo graphic plate