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Rad Phys- Exam #2 > Exam #2- Word Doc (3) > Flashcards

Exam #2- Word Doc (3) Flashcards

1
Q

The HEIGHT of a GRID lead STRIPS compared to the WIDTH between them is called what?

a. grid radius
b. grid focal range
c. grid lines
d. grid ratio

A

grid ratio

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2
Q

Which of the following 3 radiographic projections should routinely use compensating filtration?

a. AP thoracic, lateral thoracic, and full spine
b. AP lumbar, lateral lumbar and full spine
c. lateral lumbar, lateral thoracic, AP thoracic
d. lateral thoracic, lateral lumbar, lateral cervical

A

AP thoracic, lateral thoracic and full spine

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3
Q

Comparing two films with the kV and mAs constant, one taken at 40” FFD and the other at 72” FFD, which of the following would occur?

a. decreased density of the 40’’ film and increased image size on the 72’’ film
b. decreased density of the 72’’ film and decreased image size on the 40’’ film
c. increased density of the 40’’ film and decreased image size on the 72’’ film
d. increased density of the 72’’ and increased image size on the 40’’ film

A

Increased density of the 40” film and decreased the image size on the 72” film

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4
Q

The 10 day rule refers to which of the following?

a. 10 days after the onset of menses is the safest time for x-raying a female
b. 10 days before the onset of menses is the safest time for x-raying a female
c. 10 days after cessation of menses is the safest time for x-raying a female
d. 10 days before cessation of menses is the safest time for x-raying a female

A

10 days after the onset of menses is the safest time for x-raying a female

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5
Q

** An accurate collimator should not allow more than ___ percent of the SID of light outside of the exposure field.

a. 1
b. 2
c. 3
d. 4

A

2

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6
Q

** 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?

a. the first film would have more density
b. the second film would have a higher scale of contrast
c. the third film would have less density
d. they would all be the same

A

I think they would all be the same?

FIND the ANSWER!!

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7
Q

Which of the following is the most effective in REDUCING SECONDARY RADIATION?

a. collimation
b. filtration
c. tube window
d. tube housing

A

filtration

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8
Q

Too HIGH of a kV will have which effect on the film

a. quantum mottle
b. high contrast
c. blurry images
d. increased penumbra

A

quantum mottle

too HIGH kV or too LOW mAs

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9
Q

Which of the following statements is TRUE about film DENSITY?

a. 30% of the mAs is equal to 15% of the kV
b. 50% of the kV is equal to 30% of the mAs
c. 30% of the kV is equal to 50% of the mAs
d. 50% of the mAs is equal to 15% of the kV

A

50% of the mAs is equal to 15% of the kV

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10
Q

If you took a lateral LUMBAR film with 90 kV at 100 mA for one-fourth of a second using 40” FFD and it was too light but you could see all the structures, which should you do to get a better film?

a. increase the kV by 15%
b. increase the mA by doubling it
c. increase the kV by doubling it
d. increase the time by 50%

A

increase the mA by doubling it

kV is in optimal range for lat. lumbars

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11
Q

** If you took a lateral CERVICAL with 66 kV at 100 mA for one-tenth of a second at 72” FFD and it was too light but you could see the structures, which of the following would be the best solution for your retake?

a. increase the kV by 15%
b. increase the mA by doubling it
c. increase the kV by doubling it
d. increase the time by 50%

A

increase the kV by 15%

kV NOT in optimal range
(Why not increase mA as well?)

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12
Q

Which step should you take when x-raying an ELDERLY female?

a. Decrease the kV by 15%
b. Increase the kV by 15%
c. Decrease the mAs by 30-50%
d. Increase the mAs by 30-50%

A

Decrease the mAs by 30-50%

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13
Q

Rays that exit the patient and HIT the FILM are termed what?

a. classical rays
b. secondary rays
c. primary rays
d. remnant rays

A

remnant rays

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14
Q

Which of the following would result in an INCREASE in the amount of x-rays PASSING THROUGH the patient WITHOUT INTERACTION?

a. use of an air gap
b. use of a grid
c. higher mAs
d. higher kV

A

use of a grid

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15
Q

A LATERAL CERVICAL film could use which of the following that a lateral thoracic or lumbar shouldn’t?

a. an air gap
b. a grid
c. a 40’’ FFD
d. a filter

A

an air gap

cervicals = air gap
(everything else = grid)

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16
Q

** If you took four A-P lumbar films, the first with 95 kV and 6.25 mAs, the second with 106 kV and 3.75 mAs, the third at 58 kV and 60.0 mAs and the fourth at 85 kV and 8.0 mAs, which would have the LOWEST scale of contrast?

a. The first
b. The second
c. The third
d. The fourth

A

the second

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17
Q

After examining the spine of 14 year old female, ladybird Robb, you suspect that she has a scoliosis involving her thoracic and lumbar spine which you’ve decided to radiograph. Wanting to get the best film that will demonstrate Ladybird’s curvatures and being concerned about her breast tissue and gonads at her youthful age you want to offer the most practical protection. Which procedure do you choose?

a. A sectional lateral standing film
b. A section recumbant A-P film
c. A standing full spine lateral film
d. A full spine film with the patient facing the film
e. A full spine film with the patient facing the tube

A

A full spine film with the patient facing the film

18
Q

Mr. Phelandor P. Knox, a new 72-year-old patient, has low back pain and you decide to radiograph his lumbar spine and pelvis. While you are looking at the images on the films you start musing about which of Phelander’s structures has absorbed the most x-rays from your procedure. Which structure would it be?

a. His full bladder
b. His enlarged fatty liver
c. His mildly osteoporotic pelvis
d. His large amount of colonic gas
e. His distended beer filled stomach

A

His mildly osteoporotic pelvis

19
Q

Compensating two films with the kV and mAs constant, one taken at 40” FFD and the other at 72” FFD, which of the following would occur?

a. decreased density of the 40’’ film and increased image size on the 72’’ film
b. decreased density of the 72’’ film and decreased image size on the 40’’ film
c. increased density of the 40’’ film and decreased image size on the 72’’ film
d. increased density of the 72’’ film and increased image size on the 40’’ film

A

Increased density of the 40” film and decreased image size on the 72” film

20
Q

** Accurate collimator should not allow more than __ percent of the SID of light outside of the exposure field.

a. 1
b. 2
c. 3
d. 4

A

two

21
Q

Which step should you take when x-raying an ELDERLY female?

a. decrease the kV by 15%
b. increase the kV by 15%
c. decrease the mAs by 30-50%
d. increase the mAs by 30-50%

A

decrease the mAs by 30-50%

22
Q

Which of the following best describes the outcome of REDUCING the mAs by ½ and keeping the kV and the distance CONSTANT?

a. the film would have more contrast
b. the film would have less contrast
c. the film density would be increased
d. the film density would be decreased

A

the film density would be decreased

23
Q

If you took an A-P lumbar on a thin patient using 85 kV at 100 mA with the exposure time of ½ second and the film demonstrated all of the structures but was too light which should you do to get a better film?

a. increase the kV by 15%
b. increase the mAs by doubling it
c. increase the kV by 15% and decrease the mAs by 50%
d. increase the mAs by 30% and decrease the kV by 15%

A

Increase the mAs by doubling it

bc 80-90 is optimal kV range

24
Q

Which of the following would result in an increase in the amount of x-rays passing through a patient without an interaction that would produce secondary radiation?

a. use of an air gap
b. use of a grid
c. higher mAs
d. higher kV

A

use of a grid

25
Q

If you wanted to alter your CONTRAST so that a radiograph had MORE GRAY tones, what would you INCREASE?

a. filters
b. mAs
c. FFD
d. kV

A

kV

More GRAY = INCREASE kV, DECREASE mAs

26
Q

If you took four A-P lumbar films, the first with 95 kV and 6.25 mAs, the second with 106 kV and 3.75 mAs, the third at 58 kV and 60.0 mAs and the fourth at 85 kV and 8.0 mAs, which would have the LOWEST scale of contrast?

a. the first
b. the second
c. the third
d. the fourth

A

the second

27
Q

** If you took a lateral cervical with 66 kV at 100 mA for one-tenth of a second at 72” FFD and it was too light but you could see the structures, which of the following would be the best solution for your retake?

a. increase the kV by 15%
b. increase the mA by doubling it
c. increase the kV by doubling it
c. increase the time by 50%

A

increase the kV by 15%

b/c 15% increase gets it to OPTIMAL kV

28
Q

When the image on a film is VERY GRAY but the DENSITY is GOOD it is said to be ______

a. of high contrast
b. of low contrast
c. of even contrast

A

of low contrast

29
Q

Which radiographic technique would give the LONGEST scale of contrast?

a. 70 kV at 50 mAs
b. 80 kV at 25 mAs
c. 90 kV at 15 mAs
d. 110 kV at 7.5 mAs

A

110 kV at 7.5 mAs

LONG scale = LOW mAs, HIGH kV

30
Q

** If you wanted to DECREASE the DENSITY of a film, which of the following would BEST way to do so?

a. Reduce the time
b. Reduce the mA
c. Reduce the kV
d. Reduce the SID

A

Reduce the time

decreasing TIME decreases mAs

31
Q

What would the results be if you INCREASED the kV to accomplish a doubling of the film DENSITY and CUT the mAs in half?

a. The film density would increase and contrast would decrease
b. The film density would remain the same and contrast would increase
c. The film density would remain the same and contrast would decrease
d. The film density would decrease and contrast would increase

A

The film density would remain the same and contrast would DECREASE

(make it more GRAY)

32
Q

What is undesirable with magnification DISTORTION?

a. the object will be altered in shape
b. the borders of the object will be blurred
c. the borders of the object will be darker
d. the object will appear smaller

A

the borders of the object will be blurred

33
Q

** Which of the following would DOUBLE the number of PHOTONS?

a. going from a 200mA station to a 100mA station
b. going from a 200mA station to a 50mA station
c. going from a 100mA station to a 200mA station
d. going from a 100mA station to a 300mA station

A

Going from a 100mA station to a 200 mA station

34
Q

How would the image appear if there was PATIENT MOTION during the exposure?

a. clear
b. overexposed
c. underexposed
d. blurry

A

blurry

35
Q

Given the following radiographic techniques, which would have the LONGEST scale of contrast?

a. 3 mAs and 50 kVp
b. 5 mAs and 100 kVp
c. 10 mAs and 75 kVp
d. 25 mAs and 40 kVp

A

5 mAs and 100 kVp

LONG SCLALE = LOW mAs, HIGH kV

36
Q

If you wanted to INCREASE CONTRAST and MAINTAIN the same DENSITY of a previously taken film, what would you do?

a. Double the mAs and decrease the kV by 15%
b. Increase the kV by 15% and decrease the mAs by 50%
c. Increase the kV by 15% and increase the mAs by 30%
d. Double the mAs and increase the kV by 15%

A

Double the mAs and decrease the kV by 15%

Turns it to SHORT SCALE/HIGH CONTRAST

37
Q

mAs primarily influences which of the following?

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

A

density

38
Q

To DECREASE the DENSITY of a previously taken film by one-half, which would you do?

a. Increase the kV by 15%
b. Decrease the mAs by 50%
c. Increase the mAs by 30%
d. Decrease the kV by 50%

A

Decrease the mAs by 50%

or decrease the kV by 15%

39
Q

Which is PREFERRED for spinal filming?

a. a fixed kV technique
b. a variable kV technique
c. a high kV technique
d. a low kV technique

A

a fixed kV technique

40
Q

When using an AIR GAP technique, which of the following usually is NOT needed?

a. the tube
b. the tube housing
c. the patient
d. the grid

A

the grid

41
Q

Which of the following is the most common type of scatter radiation we will produce in our ray facility?

A

compton’s

Rad Phys- Exam #2 (5 decks)

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