Test 1

Question 1

Patient thickness affects image quality by affecting

Answer 1

magnification, radiographic contrast, focal spot blue

Question 2

The best way to minimize magnification is to use a

Answer 2

long SID

small OID

Question 3

The most commonly used beam restricting device is the

Answer 3

variable collimator

Question 4

The purpose of a grid is to achieve

Answer 4

improved image contrast

Question 5

Which is the linear grid with the widest latitude for catering and focus?

Answer 5

6:1

Question 6

If 10% of the viewbox light is transmitted though an area of film, what is the optical density in that area?

Answer 6

1

Question 7

The three primary geometric factors affecting image quality are

Answer 7

magnification, distortion, and focal spot blur

Question 8

Focal spot blue can be reduced by using a

Answer 8

small focal spot

Question 9

? is defined as the ability to image two separate objects and visually detect one from the other

Answer 9

resolution

Question 10

What is the formula for optical density?

Answer 10

OD=log10 (I0/It)

Question 11

Which kVP selection would result in the most scattered x-rays in the image forming beam?

Answer 11

90 kVP

Question 12

Decreasing the kVP will increae

Answer 12

patient dose

Question 13

Contrast resolution is improved by

Answer 13

tight collimation, lower kVP, patient compression

Question 14

The use of a compression device will increaee

Answer 14

Contrast

Question 15

The use of ? improves contrast and reduces patient dose.

Answer 15

collimation

Question 16

How can you improve image contrast with a heavy patient without increasing patient dose?

Answer 16

use tight collimation

Question 17

Image contrast improves when more of ? radiation is removed.

Answer 17

scattered

Question 18

Foreshortening is caused by

Answer 18

a(n) angled body part when the beam is perpendicular to the image receptor

Question 19

A grid is constructed with ? strips and ? interspace material.

Answer 19

radiopaque

radiolucent

Question 20

A radiograph with a long scale of contrast will also have ? latitude and ? contrast.

Answer 20

wide, low

Question 21

Grids are designed to remove scattered x-rays before they reach

Answer 21

the image receptor

Question 22

What is the grid ratio of a grid with 3mm height, 0.025mm thick lead grid strips, and 0.3 mm thick interspace material?

Answer 22

10:1

Question 23

Optical density is directly controlled by changing the

Answer 23

mAs

Question 24

Subject contrast is affected by

Answer 24

patient thickness

Question 25

The three primary factors influencing the intensity of scatter in the image forming beam

Answer 25

kVP, fieldd size, and patient thickness

Question 26

The positive beam limiting device (PBL) ensures that the x-ray beam is collimated to

Answer 26

the image receptor size

Question 27

? is the degree of difference in optical density (OD) between areas of an image.

Answer 27

contrast

Question 28

The amount of scatter absorption in a grid depend on

Answer 28

The angle of the scattered photon The height of the grid strips The width of the interspace material

Question 29

The purpose of a grid is to achieve

Answer 29

improved image contrast

Question 30

The interspace material in grids is made of

Answer 30

aluminum, plastic

Question 31

Grids generally have a frequency of

Answer 31

60-110

Question 32

The most critical consideration when uing a crossed grid is

Answer 32

alignment (positioning latitude)

Question 33

How could contrast be improved on a bedside radiograph of a very large

Answer 33

use a grid lower the kVp use tight collimation

Question 34

Spatial resolution improves with decreased

Answer 34

screen blur, motion blue, geometric blur

Question 35

Radiographic ? is random fluctuation in the optical density of a radiograph

Answer 35

noise

Question 36

The slope of the ? portion of the characteristic curve shows the film contrast.

Answer 36

straight line

Question 37

A film with a characteristic curve showing a high slope would be useful when ? is needed

Answer 37

high contrast

Question 38

The three primary geometric factors affecting image quality are

Answer 38

magnification distortion focal spot blur

Question 39

Distortion can be reduced by

Answer 39

placing the object plane parallel to the image plane

Question 40

How could contrast be improved on a bedside radiograph of a very large patient?

Answer 40

use a grid lower the kVp use tight collimation

Question 41

Radiographic image quality is improved when the ? is increased

Answer 41

Source image distance

Question 42

Higher speed image receptors generally produce images with

Answer 42

increased noise

Question 43

An image receptor with ? can be use over a greater range of exposures

Answer 43

wide latitude

Question 44

The densities above 2.5 on a film are represented in the ? portion of the characteristic curve.

Answer 44

base and fog

Question 45

sharpness of detail can be improved by increasing

Answer 45

SID

Question 46

Lowering kVp ? patient dose and ? image contrast.

Answer 46

Increases, increases