kVp

Question 1

KeV

Answer 1

Unit used to measure the amount of X-ray photon energy in diagnostic range

Question 2

The lowest energy valve will be controlled by _________

Answer 2

Filtration

Question 3

The highest peak energy valve will be _______

Answer 3

90 KeV

Question 4

The average energy of the beam is _____

Answer 4

30 KeV

Question 5

When kVp increases, beam quality _______ and energy _______

Answer 5

Increases; increases

Question 6

High kVp results in less ________ and more _________

Answer 6

Absorption ; transmission

Question 7

No amount of ________ will ever compensate for insufficient amount of kVp.

Answer 7

mAs

Question 8

Contrast

Answer 8

Gives visibility of detail

Question 9

When kVp increases, contrast _______ , resulting in a ________ scale contrast, and a _______ dynamic range

Answer 9

Decreases ; long ; wide

Question 10

When kVp decreases, contrast _______, resulting in a _________ scale contrast, and a ________ dynamic range

Answer 10

Increases; short ; narrow

Question 11

Increased kVp resulting in what colors?

Answer 11

Grays, lower contrast

Question 12

Decreasing kVp will result in more of what colors?

Answer 12

Black and whites, higher contrast

Question 13

When an image is overexposed kVp was probably too _______ resulting in a _______ image

Answer 13

High ; black

Question 14

When an image is underexposed kVp was probably too _______ resulting in a _______ image

Answer 14

Low ; white

Question 15

eV

Answer 15

Unit used to measure X-ray photon energy

Question 16

Optimum kVp

Answer 16

The maximum kVp level that will produce images with the appropriate contrast that are consistently within acceptable limits, will generally produce less contrast and less patient dose

Question 17

A decrease in kVp will ________ density

Answer 17

Decrease

Question 18

An increase in kVp will _________ density

Answer 18

Increase

Question 19

15% Rule

Answer 19

A 15% change in kVp will result in a change in density by a factor of 2 or 50%

Question 20

15% Rule : maintaining radiographic density

Answer 20

If kVp is increased by 15% the mAs must be cut in half to maintain density
If kVp is decreased by 15% the mAs must be doubles to maintain density

Question 21

Long scale contrast

Answer 21

More shades of gray, low contrast, wide exposure latitude, wide dynamic range, high kVp, short wavelength, increased penetration, decreased patient dose,

Question 22

Short scale contrast

Answer 22

Lower kVp, high contrast, image more black and white, less penetration, higher patient dose, narrow exposure latitude, narrow dynamic range, long wavelength

Question 23

Other factors that influence kVp?

Answer 23

Filtration, beam restriction, grids, image receptor, processing

Question 24

kVp controls what?

Answer 24

Contrast and density

Question 25

mAs controls what’s?

Answer 25

Density only

Question 26

An increase in kVp results in a __________ image density.

Answer 26

Increased

Question 27

An increase in kVp results in a __________ image contrast.

Answer 27

Decreased

Question 28

An increase in kVp results in __________ scatter fog on the radiograph.

Answer 28

More

Question 29

An increase in kVp results in __________ noise

Answer 29

More

Question 30

An increase in kVp results in a __________ scale of contrast.

Answer 30

Longer

Question 31

An increase in kVp results in __________ penetration.

Answer 31

More

Question 32

An increase in kVp results in __________ patient dose.

Answer 32

Less

Question 33

An increase in kVp results in a __________ exposure latitude.

Answer 33

Wide