5/30 Ch 5 Rad Test

Question 1

The difference in density and mass of two adjacent anatomic structures.

Answer 1

Subject contrast

Question 2

The measurable/visible difference between two radiographic densties.

Answer 2

Contrast

Question 3

The relation of the height of the lead strips to the distance between them.

Answer 3

Grid ratio

Question 4

Non-image forming radiation that is scattered in all directions because of objects in the path of the primary beam.

Answer 4

Scatter

Question 5

X-rays turn radiographic what color?

Answer 5

Black

Question 6

Provide 4 factors that can affect radiographic density.

Answer 6

mAs, kVp, developer time and temp, & tissue density.

Question 7

Loss of detail due to geometric distortion.

Answer 7

Geometric unsharpness

Question 8

Provide two examples of geometric distortion.

Answer 8

Elongation, magnification, and foreshortening

Question 9

What metal do grids contain that allows them to absorb scatter radiation?

Answer 9

Lead

Question 10

If a dog is being radiographed for hip dysplasia, what will occur if the femurs are NOT parallel to the film?

Answer 10

Foreshortening

Question 11

What occurs when the image appears lighter, with distinct white lines over the underexposed areas of the film?

Answer 11

Grid cutoff

Question 12

What is the primary exposure factor that controls scatter radiation?

Answer 12

kVp

Question 13

What anatomic areas are best viewed using a short scale?

Answer 13

Bone

Question 14

What anatomic areas are best viewed using a long scale?

Answer 14

Soft tissue

Question 15

What is the primary exposure factor that affects density?

Answer 15

mAs

Question 16

Wat is the primary exposure factor that affects contrast?

Answer 16

kVp

Question 17

In terms of subject contrast, what structure is considered the densest?

Answer 17

Bone

Question 18

In terms of subject contrast, what structure is considered the least dense?

Answer 18

Gas-filled areas

Question 19

When viewing a radiograph that appears to be over penetrated, what exposure factor will you adjust?

Answer 19

kVp, decrease by 10-15%

Question 20

What is the thicknessof the lead strips in a grid?

Answer 20

0.5mm

Question 21

Where is the Potter Bucky diaphragm normally found on an x-ray table?

Answer 21

Under the table (moves during exposure)

Question 22

What is used to desrcibe image sharpness, clarity, distinctness and perceptibility?

Answer 22

Radiographic detail

Question 23

High contrast =?

Answer 23

Short scale

Question 24

Low contrast=?

Answer 24

Long scale

Question 25

A radiograph with an increased number of grey tones exhibits?

Answer 25

Long scale of contrast

Question 26

A radiograph that is mainly black and whites (few shades of grey) exhibits?

Answer 26

Short scale of contrast

Question 27

If a radiograph appears to be overexposed, has an overall black appearance, but the contrast is not affected, what exposure factor will you adjust for the re-take?

Answer 27

Decrease mA by 30-50%

Question 28

mA=?

Answer 28

Density

Question 29

kVp=?

Answer 29

Contrast

Question 30

Most scatter radiation comes from?

Answer 30

Patient

Question 31

What is the spacer material in grids made of?

Answer 31

Fiber, aluminum, or plastic

Question 32

A grid reduces scatter by how much?

Answer 32

85-90%

Question 33

Grid focus

Answer 33

The distance between the source of x-rays and the grid in which the grid is effective without grid cutoff.

Question 34

Lines per centimeter

Answer 34

The number of lead strips per centimeter area of a grid.

Question 35

Grid cutoff

Answer 35

A progressive decrease in transmitted x-ray intensity caused by absorption of primary x-rays by the grid lines.

Question 36

Grid efficiency

Answer 36

The ability of a grid to absorb non-image forming radiation in the produciton of a quality radiograph.

Question 37

Grid ratio

Answer 37

The relation of the height of the lead strips to the distance between them.

Question 38

Grid factor

Answer 38

The amount the exposure needs to be increased to compensate for the grid's absorption of a portion of the primary beam.

Question 39

Which grid pattern is the most common?

Answer 39

Linear

Question 40

Which grid type is most common?

Answer 40

Focused grid

Question 41

What are Potter-Bucky Diaphragms usually used for?

Answer 41

Large animal, human medicine and moves back and forth during exposure

Question 42

Geometric unsharpness

Answer 42

Loss of detail due to geometric distortion

Question 43

Geometric Distortion

Answer 43

Variation in normal size and shape of anatomic structures due to their position in relation to the x-ray source and film.

Question 44

Elongation

Answer 44

Distortion of anatomic structures so that the image appears longer than actual size, owing to the x-ray beam not being directed perpendicular to the film surface.

Question 45

Foreshortening

Answer 45

Distortion of anatomic structures when the image appears shorter than actual size due to the plane of interest not being parallel to the film surface.

Question 46

Fast or slow motion gives more detail?

Answer 46

Slow