Exam #2- Word Doc (4)

Question 1

If you compared the two radiographs of a cervical spine with one having been taken at 40” and the other at 72” with the appropriate change in the radiographic technique, what would you find?

a. On the 40” film the image will be larger and clearer
b. On the 40” film the image will be smaller and less clear
c. On the 72” film the image will be smaller and clear
d. On the 72” film the image will be larger and less clear

Answer 1

On the 72” film the image will be smaller and clear

Question 2

Which of the following will ABSORB the most x-rays?

a. bone
b. soft tissue
c. CT
d. organs

Answer 2

bone

absorbs all or most

Question 3

Let’s say that you practice in Dwarf, Kentucky and in comes a short little guy dressed in green named Mr. H Swagelle. During your conciliation you find out that he has cervical complaints and he tells you to fix it and that money is no object since he is the illegitimate son of a billionaire in New York. When looking at his cervical films you noice that one said of them is lighter than the other. What should you suspect is the cause of this appearance?

Answer 3

your focused grid has been installed backwards

Question 4

Your dear friend who practices in Tie Plant, Mississippi calls you for some advice. He/she says that they have x-rayed the cervical of a patient and the lateral film is too light but all the structures show up. You asked what the factors are and your friend said they used 50 kV at 10 mAs at 72” source image distance using a 400 speed screen. So you struggle around trying to find your Rad 3 notes (which your friend had sold as soon as they got out of the course). You look up the information in your notes and come up with which best solution?

Answer 4

increase the kV by 15%

Question 5

** Which of the following is most closely related to “DIFFERENTIAL ABSORPTION”?

a. contrast
b. density
c. size
d. blurriness

Answer 5

contrast

Question 6

Which of the following is the primary factor for radiographic DENSITY?

a. kV
b. mAs
c. tube distance
d. grid

Answer 6

mAs

Question 7

With which of the following percentages in mAs would you expect to see the slightest change in radiographic density?

a. 15%
b. 30%
c. 50%
d. 100%

Answer 7

30%

Question 8

The use of a GRID has which main effect on the patient?

a. it increases x-ray exposure to the patient
b. it reduces patient motion
c. it reduces x-ray exposure to the patient
d. it more evenly disburses the patient soft tissue

Answer 8

it increases x-ray exposure to the patient

Question 9

The HIGHER the kVp the more _________ radiation is produced?

a. compton
b. classical
c. characteristic
d. photoelectric

Answer 9

compton

scatter

Question 10

What is an ADVANTAGE of HIGH kVp technique?

a. less film fog
b. less latitude
c. increased detail
d. decreased motion
e. lowered patient radiation dose

Answer 10

lowered patient radiation dose

mAs increased patient radiation

Question 11

Which of the following would you do if you were going to use the 30% rule?

a. alter the mAs by 30%
b. alter the kV by 30%
c. alter the kV by 15% and the mAs by 15%
d. alter the kV by 10% and the mAs by 5%

Answer 11

alter the mAs by 30%

Question 12

An AIR GAP technique has which affect?

Answer 12

reduces the amount of scatter to the film

GRID NOT needed

Question 13

When going from a GRID to a NON-GRID technique on the same body part, with the same FFD, kVp and mAs would cause which of the following?

Answer 13

the film would be darker

Question 14

Which of the following is recommended for use of a stationary grid in spinal radiography?

Answer 14

slightly more than 100 lines per inch

100-103

Question 15

Of the following, which is in the range of body part thickness when a grid should first be considered advantageous to use?

a. 2 cm
b. 12 cm
c. 20 cm
d. 25 cm

Answer 15

12 cm

10-15 cm thick

Question 16

Which of the following is TRUE about GRIDS?

a. they increase patient radiation
b. they should be used with smaller body parts
c. they should not be used with films of the pelvis
d. they work best if the lead strips are parallel

Answer 16

they increase patient radiation

Question 17

If you were re-x-raying an obese patient because your first film was too light but you could see the osseous structures, which of the following would be the best thing to do in order to get the best quality radiograph?

a. increase the exposure time
b. increase the kV
c. increase the mAs
d. increase the FFD

Answer 17

increase the mAs

Question 18

Which would ABSORB the most x-rays in a patient?

a. lungs
b. heart
c. vertebrae
d. trachea
e. aorta

Answer 18

vertebrae

bone

Question 19

** Which of the following is most closely related to “DIFFERENTIAL ABSORPTION”?

a. subject contrast
b. film density
c. remnant radiation
d. scatter radiation

Answer 19

subject CONTRAST

Question 20

Determine which radiographic technique would yield a LONGEST scale of contrast

a. 85 kV and 30 mAs
b. 95 kV and 10 mAs
c. 70 kV and 40 mAs
d. 80 kV and 20 mAs

Answer 20

95 kV and 10 mAs

long scale = LOW mAS, HIGH kV

Question 21

If you had a film that was OVER-EXPOSED (dark), but you could see the image, which of the following would improve your film?

a. increasing the kV by 15%
b. increasing the mAs by 50%
c. decreasing the mAs by 50%
d. decreasing the mAs and increasing the kV by 15%

Answer 21

decreasing the mAs by 50%

OR decrease the kV by 15%

Question 22

Which of the following would produce the same film density as 200 mA for 0.5 sec?

a. 300 mA for 1.5 sec
b. 150 mA for 3/4 of a second
c. 150 mA for 2 sec
d. 100 mA for 1 sec

Answer 22

100 mA for 1 sec

Question 23

If you took a retake and REDUCED the kVp by 15% and INCREASED the mAs by adding 30%, how would the second film look compared to the first?

a. the second film would be lighter than the first
b. the second film would have less contrast than the first
c. the second film would be the same contrast as the first
d. the second film would be darker than the first

Answer 23

the second film would be lighter than the first

Short scale/high contrast

Question 24

Generally speaking, adding 4 kVp to a radiographic technique with a single phase machine would be the equivalent to which of the following?

a. increasing the mAs by 50%
b. increasing the mAs by 30%
c. increasing the mAs by 15%
d. increasing the mAs by 60%

Answer 24

increasing the mAs by 30%

Question 25

To which of the following does the 15% rule apply?

a. kV
b. mA
c. seconds
d. tube distance

Answer 25

kV

mA is 30% rule

Question 26

Which is true about the air gap technique when normally used in a cervical spine series?

a. it makes the vertebra appear longer
b. it requires a longer tube distance
c. it usually doesn’t require the use of a grid
d. it is best used with the A-P cervical film

Answer 26

it usually doesn’t require the use of a grid

Question 27

** If you make an exposure at 100 mAs with 80 kV and the radiographic density is good, what would be the outcome if you x-rayed the same part of the same person a second time with 50 mAs and 92 kV?

a. the first film would have a lower contrast
b. the first film would have a higher contrast
c. the second film would be over-exposed
d. the second film would be under-exposed

Answer 27

the first film would have a HIGHER contrast

short scale

Question 28

When using a STATIONARY grid, which of the following is recommended for spinal filming?

a. 5:1 grid ratio
b. 8:1 grid ratio
c. 10:1 grid ratio
d. 16:1 grid ratio

Answer 28

10:1 grid ratio

could be 12:1