Exam 3

Question 1

Due to patient circumstances you have to increase SID and want to keep a consistent OD. Which law/rule will help to keep a consistent OD with the change in SID.

Answer 1

Direct square law

Question 2

Due to patient circumstances you want to decrease patient exposure and keep a consistent OD. Which rule/law will help?

Answer 2

15% rule

Question 3

All images on a radiograph demonstrate some level of an increase is size of objects compared to the anatomy they represent. This is called what?

Answer 3

Magnification

Question 4

How does having a smaller focal spot affect spatial resolution?

Answer 4

Small focal spot increases sharpness/spatial resolution of an image

Question 5

How does increasing SID affect spatial resolution?

Answer 5

It increases detail and spatial resolution

Question 6

How does positioning the part of interest parallel with the image receptor affect spatial resolution?

Answer 6

Increases spatial resolution and decreases shape distortion

Question 7

There are positive and negative contrasts. Barium is a __________ and air is a __________ contrast.

Answer 7

Positive; negative

Question 8

What type of contrast is determined by the size, shape, and x-ray attenuating characteristics of the subject who is being examined and the energy of the x-ray beam

Answer 8

Subject contrast

Question 9

Which resolution (in regards to image quality) is the ability to image small objects that have high subject contrast?

Answer 9

Spatial resolution

Question 10

What resolution (regarding image quality) is the ability to distinguish anatomical structures of similar subject contrast (Ability to distinguish between similar tissues)

Answer 10

Contrast resolution

Question 11

T/F: In radiography, density is a visible representation of the quantity of X-ray photons reaching the IR.

Answer 11

True

Question 12

T/F: Increasing mAs increases density.

Answer 12

True

Question 13

Blurred region would seen over entire image; technologist has a lot of control over reducing this type of blur

Answer 13

Motion blur

Question 14

Blurred region on the outer most edge of the image; technologist has little or no control over

Answer 14

Focal spot blur

Question 15

Decreasing kVp [x] beam attenuation [y] absorption and [z] transmission.

Answer 15

Increases; increases; decreases

Question 16

Increasing kVp [x] beam attenuation [y] absorption and [z] transmission

Answer 16

Decreases; decreases; increases

Question 17

Decreasing tissue atomic number [x] beam attenuation [y] absorption and [z] transmission.

Answer 17

Decreases; decreases; increases

Question 18

Increasing tissue atomic number [x] beam attenuation [y] absorption and [z] transmission

Answer 18

increases; increases; decreases

Question 19

Decreasing tissue thickness [x] beam attenuation [y] absorption and [z] transmission

Answer 19

decreases; decreases; increases

Question 20

Increasing tissue density [x] beam attenuation [y] absorption and [z] transmission

Answer 20

increases; increases; decreases

Question 21

Muscle tissue has atomic particles that are [x] dense or compact than fat cells and therefore attenuate the x-ray beam [z] than fat cells

Answer 21

more; more

Question 22

The range of exposures (aka the number of shades of gray) that can be accurately detected on an analog image

Answer 22

Dynamic range

Question 23

Using a positive contrast produces more brightness in a specific area (for example, barium in the stomach) than the adjust tissues. Therefore, positive contrast [increases/decreases] attenuation

Answer 23

increases

Question 24

The chest represents high contrast anatomy (high subject contrast). Therefore, which of the following is most appropriate?
high kVp
high mAs
low kVp
low mAs

Answer 24

High kVp

Question 25

The _______ atomic number of a material, the _____ the number of photoelectric absorption interactions will be.

Answer 25

higher; higher

Question 26

The device for removing long-wavelength radiation from the primary x-ray beam is the:

Answer 26

filter

Question 27

Low quality x-rays will _________ attenuation in biological tissue of the same thickness and

Answer 27

Increase

Question 28

If the radiograph (specifically an analog image) is under penetrated, the technologist can compensate by

Answer 28

Increasing kVp

Question 29

requires an increase in technical factors because the affected body tissue increases in thickness, resulting in more attenuation of the X-ray beam

Answer 29

Additive disease

Question 30

All affect differential absorption except -X-ray quantity -Tissue mass density / tissue atomic number -kVp

Answer 30

X-ray quantity

Question 31

A non-diagnostic image shows a long scale of radiographic/image contrast due to excessive penetration. Which technique change would be appropriate?

Answer 31

lower kVp

Question 32

A destructive disease, takes away from tissue density. For example, osteoporosis results from the loss of calcium of the bone. Therefore, would cause the bone to appear more:

Answer 32

radiolucent

Question 33

The thicker the body part, the greater the ________ of radiation needed to produce an acceptable image.

Answer 33

quality and quantity

Question 34

The primary function of mAs for an analog image (film/screen image) is to:

Answer 34

Regulate density

Question 35

The optical density of a radiograph can be increased by employing a:

Answer 35

Higher mAs value

Question 36

The difference in radiographic density between any two adjacent portions of the image is called:

Answer 36

contrast

Question 37

Short scale radiographic/image contrast in a radiograph is increased by

Answer 37

Decreased kVp

Question 38

Penetration of a part to be radiographed is primarily a function of the:

Answer 38

kVp

Question 39

Motion of the patient either voluntary or involuntary, during the exposure will result in decreased:

Answer 39

Detail

Question 40

If you halved the time of exposure, how much would you change the mA to obtain the same density on the radiograph?

Answer 40

double the mA

Question 41

If kVp is decreased, what happens to recorded detail?

Answer 41

It has no effect

Question 42

If 60 mAs was set with 0.3 seconds, what was the mA?

Answer 42

200 mA

Question 43

If 10 mAs was set with a 300 mA, what was the seconds?

Answer 43

0.03

Question 44

Generally speaking, what do destructive pathologic conditions require?

Answer 44

Decreased kVp

Question 45

A radiograph is taken at 100 mA and 2 seconds. The finished radiograph exhibited patient motion. The new time if the mA is increased to 400 would be:

Answer 45

1/2 second

Question 46

In an analog image, a longer scale of radiographic / image contrast within the part can be obtained by

Answer 46

increasing the kVp