3

Question 1

when using a stationary grid what is recommended for spinal filming

Answer 1

10:1 grid ratio

Question 2

contrast bt structures of different subject densities is due to what?

Answer 2

differential absorption

Question 3

which would have the lowest contrast

Answer 3

50 mAs with 110 kV

Question 4

effect that scatter radiation has on a film

Answer 4

causes graying of the film

Question 5

with all equal factors which technique would demo the most film grain (quantum mottle)

Answer 5

100 kV with 200 mA for 1/8 sec

Question 6

the film ____ is the main function of mAs

Answer 6

density

Question 7

a pt xray is so light you cannot see any bones at all, what change in technique should you do?

Answer 7

double mAs and increase kV by 15% more

Question 8

pt with the ___ measurements for the AP view will have the grayest AP lumbar film

Answer 8

smallest (rutherford H, meas 20 cm)

Question 9

to obtain a quality film for an obese pt xray, what should you do

Answer 9

lower kV in the optimal range

Question 10

osteoporosis will usually require you to:

Answer 10

reduce the tube output

Question 11

which rad projections routinely uses an air gap technique

Answer 11

lateral cervical

also flexion, extension, and oblique cervical

Question 12

a film w/ a darkened overall gray appearance could be caused by:

Answer 12

exposure of the film to scatter

Question 13

grid ____ refers to an attenuation of part of the beam by the grid

Answer 13

cut off

Question 14

a film that is lighter on one side than the other most likely would indicate:

Answer 14

grid cut off

Question 15

if you reduce the mAs by one half and keep the kV and distance constant, what is the outcome

Answer 15

the film density would be decreased

Question 16

what would increase the amount of xrays passing thru the pt w/o an interaction that would prod secondary radiation?

Answer 16

higher kV

Question 17

what three rad projections should routinely use compensating filtration

Answer 17

AP thoracic
lat thoracic
full spine

Question 18

comparing 2 films with the kV and mAs constant, one taken at 40” FFD and the other at 72” what would occur

Answer 18

increased density of 40” film

decreased image size on 72” film

Question 19

what is the 10 day rule

Answer 19

10 days after the onset of menses is the safest time to xray a female

Question 20

an accurate collimator shouldnt allow more than __% of the SID of light outside the exposure filed

Answer 20

2

Question 21

-if a film was taken at 80 kV and 100 mA for 1/2 sec
-then a second at 80 kV and 50 mA for 1 sec
-and a third at 80 kV and 200 mA for 1/4 sec
what would the outcome be?

Answer 21

they are all the same

Question 22

what is most effective in reducing SECONDARY radiation

Answer 22

filtration

Question 23

too high a kV will have what effect on the film

Answer 23

quantum mottle (grainy)

Question 24

__% of the mAs is equal to __% of the kV

Answer 24

50%

15%

Question 25

what step should you take when xraying an elderly female (same as osteoporotic, bedridden)

Answer 25

decrease mAs by 30-50%

Question 26

rays that exit the pt and hit the film

Answer 26

remnant rays

Question 27

a lat cervical film could use what that a lat thoracic or lumbar couldnt

Answer 27

air gap

Question 28

how should you reduce reproductive radiation on a 14 yo female pt with scoliosis of TS and LS

Answer 28

full spine film with pt facing film

Question 29

72 yo pt gets xrays, what structure has absorbed the most xrays?

Answer 29

mildly osteoporotic pelvis

Question 30

take a lat lumbar w/ 90 kV at 100 mA for 1/4 sec using 40” FFD, was too light but could see all the structures, what would you do?

Answer 30

increase mA by doubling it

Question 31

took lat cervical with 66 kV at 100 mA for 1/10 sec at 72” FFD, too light but could see struct, what would you do?

Answer 31

increase kV by 15%

Question 32

what is most closely related to “differential absorption”?

Answer 32

subject contrast

Question 33

If a film was taken at 80 kV at 100 mA for ½ second and a second was taken at 80 kV at 50 mA for one second and a third film at 80 kV at 200 mA for ¼ second, what would be the outcome

Answer 33

they would all be the same