Xch 28,29,30,31 - Tech Unit 1 & 2

Front 1

High contrast is a product of:

Back 1

low kVp

Front 2

The D log E curve shows the relationship between x-ray exposure given, and the resulting:

Back 2

density

Front 3

All of the following are related to contrast and kVp except:

Back 3

brightness

Front 4

Anatomic parts having high subject contrast will produce ______ radiographic contrast.

Back 4

high

Front 5

Which of the following radiographic procedures requires a short scale of contrast?

Back 5

foot

Front 6

When referring to radiographic technique, which of the following factors are taken into consideration?

Back 6

mA, kVp, seconds

Front 7

How much must the mAs be increased before a noticeable change in density can be seen?

Back 7

30%

Front 8

Which factors affects radiographic density?

Back 8

SID, OID, mAs

Front 9

Increasing kVp will result in which of the following?

Back 9

Increasing photon energy

Front 10

___________ describes the concept of density as it is displayed on a soft-copy monitor for digital images.

Back 10

brightness

Front 11

_________ describes the digital processing that produces changes in density/brightness, so it is appropriate to use when controlling image density.

Back 11

window level

Front 12

When is contrast masking used?

Back 12

When it is difficult to ignore nearby factors

Front 13

Which of the following represents the useful range of radiographic densities?

Back 13

.25 to 2.5

Front 14

Which of the following factors affect radiographic density? 1, 2 and 3 <kVp, mAs,SID> The OD number of an image is 1.3. If the OD number is increased to 1.6, the density is _______________.

Back 14

Doubled

Front 15

Which of the following scales of contrast will produce more shades of gray?

Back 15

Long scale

Front 16

Subject contrast relates to which of the following?

Back 16

the patient

Front 17

A D log E curve that demonstrates a steep curve (as opposed to a more horizontal curve) represents a film with which of the following?

Back 17

high contrast

Front 18

What affects subject contrast?

Back 18

size of patient, part, type of tissue

Front 19

Low energy radiation will result in which of the following?

Back 19

short scale contrast

Front 20

Which of the following results in low energy radiation:

Back 20

low kVp

Front 21

____________ is used as the primary controller of image receptor exposure and film density.

Back 21

mAs

Front 22

___________ accurate describes the digital processing that produces changes in the range of density/brightness.

Back 22

window width

Front 23

____________ is the number of useful visible densities or shades of gray.

Back 23

Scale of Contrast

Front 24

Which of the following describes the blackness on a radiograph?

Back 24

density

Front 25

What is the definition of recorded detail?

Back 25

The sharpness of the structural lines

Front 26

Recorded detail can be improved by which of the following?

Back 26

Maximum SID

Front 27

Misrepresentation of the true size or shape of an object is the definition of which of the following?

Back 27

Distortion

Front 28

Definition and spatial resolution are both synonymous with:

Back 28

recorded detail

Front 29

Resolution is poor as SID:

Back 29

decreases

Front 30

Which of the following is least likely to affect the sharpness of the radiographic image?

Back 30

kVp

Front 31

Which of the following refers to the amount of recorded detail on a radiograph?

Back 31

Resolution

Front 32

If the SID is 40 inches, and the OID is 4, what is the magnification factor?

Back 32

1.1

Front 33

If the SID is 40 inches, and the SOD is 35, what is the magnification factor?

Back 33

1.1

Front 34

To avoid shape distortion, which of the following must be paid close attention to?

Back 34

Part angulation

Front 35

For digital imaging, resolution is determined by:

Back 35

pixel size, matrix size, gray scale bit depth

Front 36

If a projected image measures 7 inches and the magnification factor is 2.04, what is the size of the actual object?

Back 36

3.4

Front 37

Which of the following will occur when the OID is decreased?

Back 37

The image is closer to actual size

Front 38

If the central ray is perpendicular to the image receptor, but the part is angled, what will be the result?

Back 38

Foreshortening

Front 39

How will SID affect the recorded detail in a radiograph?

Back 39

Increase recorded detail

Front 40

How does magnification affect the radiographic quality of an image?

Back 40

Decreases recorded detail

Front 41

What are the 2 types of distortion that can reduce the quality of a radiograph?

Back 41

size and shape

Front 42

Background information that the IR receives during digital radiography is called:

Back 42

image noise

Front 43

If the projected image measure 6 inches and the magnification factor is 1.05, what is the size of the actual object?

Back 43

5.7

Front 44

Tube angulation will produce which of the following types of shape distortion?

Back 44

Elongation