1

Question 1

to double the density of a film using mAs you would increase it by:

Answer 1

100%

Question 2

a reciprocating grid is THICKER than a

Answer 2

stationary grid

Question 3

when converting from a grid with a low ratio to a grid with a high ratio, what do you need to do to maintain good film quality?

Answer 3

increase mAs

Question 4

what grid type is recommended for spinal radiography in the usual chiropractic office?

Answer 4

focused grid

Question 5

what effect does using a high kV technique have?

Answer 5

produces more scatter

Question 6

the preferred focused grid range for spinal radiography is

Answer 6

40” to 72”

Question 7

if a film has an overall darkened gray appearance but visible structures the probable cause of the PROBLEM would be:

Answer 7

exposure of the film to scatter

Question 8

the term “optimal kV” refers to the:

Answer 8

lowest possible mAs w/ acceptable contrast on the film

Question 9

***how many lines per inch are recommended for a stationary grid?

Answer 9

100-103 (?)

Question 10

diminished penetration at the periphery of a grid is termed:

Answer 10

grid cut-off

Question 11

if a film is said to be “burned out” what would it look like?

Answer 11

too dark

Question 12

the main reason why a “fixed kV technique is preferred”

Answer 12

contrast is consistent

Question 13

remnant radiation refers to (2)

Answer 13

• scattered rays that leave the pt and reach the grid

- primary rays that leave the pt and reach the grid

Question 14

a ____ grid would produce the LEAST amount of grid lines

Answer 14

moving

Question 15

exceeding the optimal kV range while maintaining good density will yield a film that has:

Answer 15

long scale contrast

Question 16

as a gen rule, if youre going to xray an elderly pt you should do what to your established radiographic technique?

Answer 16

decrease it

Question 17

**using what would increase pt exposure

Answer 17

a 10:1 stationary grid

Question 18

if you took a lateral cervical with 66 kV at 100 mA for 1/10th of a sec at 72” FFD and it was too light but you could see the structures, what would the best solution be

Answer 18

increase kV by 15% (to make 66 in optimal range)

Question 19

about how much increase in mAs is required when going from a non grid technique to using a technique with a 12:1 grid

Answer 19

5x

Question 20

if you took a 14x17” lateral lumbar film and saw that the L5-S1 area was too LIGHT what would be the best thing to do?

Answer 20

take a spot 8x10” lateral, increase mAs by 60%

only add kV if 8x10 is STILL too light

Question 21

if you saw a blood vessel on end (axially) on a chest film it would probably look like which of the four natural body (subject) densities

Answer 21

water

Question 22

if you saw 2 structures each w/ paralleling tracks of calcification overlying the articular pillars diverging at the superior and closer at the inferior, what would you be looking at?

Answer 22

part of thyroid cartilage

Question 23

if you took an AP lumbar on a thin pt using 85 kV at 100mA w/ the exposure time of 1/2 a sec and the film demonstrated all of the structures but was too light what would you do to get a better film

Answer 23

increase mAs by doubling it

Question 24

an elderly, overweight, retired exotic dancer injured her back after a fall. you first take an AP lumbar using 90kV with 100 mAs for 1 sec at 40” SID. the film is very gray and you need to retake it. what should you do?

Answer 24

use 200 mA and decrease kV 15%

Question 25

you take a lateral cervical film at 65 kV and 10 mAs w/o a grid, and its light but you can see the structures. what is the best thing to do for the retake?

Answer 25

increase kV by 15%

Question 26

if you took four Ap lumbar films, which would have the lowest contrast?
95 kV and 6.25 mAs
106 kV and 3.75 mAs
58 kV and 60 mAs
85 kV and 8.0 mAs

Answer 26

the second

Question 27

you decided not to use a grid for an AP lumbar film and adjusted the radiographic technique to maintain a good density what would be the outcome?

Answer 27

film would be very gray

Question 28

to double the density of a film with kVp, you should apply which rule?

Answer 28

15%

Question 29

if you compared 2 radiographs of the CS, one taken at 40” the other at 72” with the appropriate change in the rad technique, what would you find?

Answer 29

72” film the image would be smaller and clearer

Question 30

what could be a problem if your xray tube was laterally shifted from the center of the film?

Answer 30

shape distortion

Question 31

primary purpose of a grid

Answer 31

reduce scatter radiation to the film