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Question 1

what increases compton’s radiation?

Answer 1

higher kVp

Question 2

term used when comparing the height of the absorbing strips to the width of the interspacing material of a grid

Answer 2

grid ratio

Question 3

rec optimal kV range for an AP lumbar film

Answer 3

80-90

Question 4

which interspacing material is best for xraying the spine

Answer 4

aluminum

Question 5

scatter that is directed toward the tube is known as

Answer 5

back scatter

Question 6

if you wanted to alter your contrast so that the radiograph had more gray tones, what would you INCREASE

Answer 6

kV

Question 7

what effect does using a reciprocating grid have that a stationary grid doesnt?

Answer 7

blurs out grid lines

Question 8

what would produce a film with the most visible grainy?

Answer 8

high kVp / low mAs film

Question 9

which of the four lateral cervical films would be DARKEST?
75 kV and 14 mAs
65 kV and 14 mAs
85 kV and 14 mAs
95 kV and 14 mAs

Answer 9

the fourth

Question 10

how much increase in mAs is needed to maintain the same density when reducing the xray frield from 14x17” to 8x10”

Answer 10

60%

Question 11

T/F: the more peripheral parts of the xray beam cause less distortion

Answer 11

FALSE

Question 12

recommended optimal kV range for AP full spine

Answer 12

80-100

Question 13

a film exposed to secondary radiation will have what appearance

Answer 13

it grays the film making it dark

Question 14

an INCREASE in _____ will most likely DECREASE the amount of scattered radiation to a film

Answer 14

mAs

Question 15

xraying an elderly obese pt, what would be helpful in obtaining the best quality film?

Answer 15

use a lower kV in the optimal range

Question 16

what would cause a decrease in SUBJECT density

Answer 16

disuse atrophy

Question 17

you just receive a 300 mA 125 kV xray unit. the box says “focused grid with focal range of 40-72”, 8:1 ratio, aluminum interspacing material” -why wouldnt you want this?

Answer 17

the max rec kV for an 8:1 grid is 90 and you may want to use more

Question 18

with variable kV technique and an elderly pt with a 40 cm lumbar region (large abdomen), what is the predictable problem you would have for xray?

Answer 18

there will be too long of a scale of contrast

Question 19

if you increased the mAs and reduced the kV from a given rad technique what would be the outcome (on the FILM)?

Answer 19

would have more contrast

Question 20

to decrease density of a previous film by 1/2, which would you do?

Answer 20

decrease mAs by 50%

Question 21

if a film is too dark, it is AKA

Answer 21

overexposed

Question 22

rad technique w/ the shortest scale of contrast

Answer 22

60 kV with 100 mA for 2 sec

Question 23

about how many kV would be needed to make the slightest visible change in density on a radiograph if you were using a SINGLE phase unit

Answer 23

4

Question 24

what would the effect of adding 100% mAs to a radiographic technique have?

Answer 24

would double the density of the film

Question 25

what best describes what you should expect if you retake an AP lumbar with 15% decrease in the kV and leave the mAs constant

Answer 25

the density of the film would be reduced by 1/2

Question 26

rec optimal kV range for an AP thoracic film

Answer 26

75-85

Question 27

in the port of a used xray tube, the entire surface of the anode has bumps, this is called

Answer 27

anode pitting

Question 28

a filament does what

Answer 28

forms electrons

Question 29

in which direction do grid lines run

Answer 29

in the long axis of the pt

Question 30

which rad technique would cause the most absorption of xrays in a pt BODY

Answer 30

10 mAs with 140 kV (highest kV)

Question 31

MC cause of a blurry image

Answer 31

pt motion