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Ch. 20 Angiography and Interventional Procedures > Chapter 36 > Flashcards

Chapter 36 Flashcards

1
Q

Leakage radiation must be less then ____mR/hr at a distance of 1 m from the protective housing

A

100

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2
Q

The SID indicator must be accurate within __% of the indicated SID.

A

2

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3
Q

The x-ray beam and the light must beam must coincide within ___% of the SID

A

2

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4
Q

The PBL must be accurate to within ___ of the SID

A

2

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5
Q

The variation in x-ray intensity should not exceed ___%

A

5

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6
Q

The maximum acceptable variation in linearity is ___% from one mA station to an adjacent mA station.

A

10

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7
Q

The SSD must not be less than ___cm on stationary fluroscopes and not less then ___ cm on mobile fluroscope.

A

38, 30

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8
Q

___ time produces an audible signal when the fluroscopc time has exceeded 5 minutes

A

cumulative

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9
Q

What device is used to cover the opening on the side of a fluroscopic table when the bucky tray is moved out the way?

A

bucky slot cover

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10
Q

A ___ of at least 0.25mm Pb equivalent should be positioned between the fluroscopist and the patient

A

protective curtain

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11
Q

____ radiation is the useful beam.

A

primary

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12
Q

What are the two types of secondary radiation:

A

scatter and leakage

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13
Q

The intensity of scatter radiation 1 m from the patient is approximately __% of the intensity of the useful beam at the patient.

A

0.1

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14
Q

When PBL is activated, the collimators are automatically adjusted so that the radiation field matches the ____.

A

film size

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15
Q

What are the two type of filtration?

A

inherent and added

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16
Q

The glass envelope encasing the

x-ray tube, the insulating oil, and the glass window are examples of what type of filtration?

A

inherent

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17
Q

Inherent materials amounts to approximately __mm of aluminum equivalent.

A

0.5

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18
Q

A sheet of aluminum or its equivalent of appropriate thickness located outside the glass window of the tube housing above the collimator shutters are examples of what type of filtration?

A

added

19
Q

Added filtration is __ mm of aluminum equivalent

A

1

20
Q

The inherent and added filtration should combine to equal the required ___ of aluminum equivalent. (fixed tube, above 70kVp)

A

2.5

21
Q

The variation in the x-ray intensity should not exceed _%

A

5

22
Q

The maximum acceptable variation in linearity is __% from one mA station to an adjacent mA station

A

10

23
Q

The x-ray control panel must show _____.

a. beam on time
b. mAs used
c. positive beam limitation
d. automatic exposure controls

A

A

24
Q

What is the minimum requirement for filtration on x-ray equipment operating above 70 kVp?

a. 1.5 mm Al equivalent
b. 2.0 mm Al equivalent
c. 2.5 mm Al equivalent
d. 3.5 mm Al equivalent

A

c

25
Q
  • The output intensities of reproduced exposures should not vary more than _____% from each other.
    a. 5
    b. 10
    c. 15
    d. 20
A

A

26
Q
  • Measuring the relationship between the output intensities of adjacent mA stations is a test of _____.
    a. HVL
    b. beam limitation
    c. reproducibility
    d. linearity
A

D

27
Q
  • The source-to-skin distance must be no less than _____ cm on stationary fluoroscopes.
    a. 30
    b. 38
    c. 42
    d. 48
A

B

28
Q
  • The _____ is the primary protective barrier for the fluoroscopic x-ray tube.
    a. ceiling
    b. floor
    c. image intensifier
    d. table top
A

C

29
Q

A fluoroscopy system with automatic collimation must provide an unexposed border around the image at _____ above the table top.

a. all heights
b. 35 cm
c. 25 cm
d. 18 cm

A

A

30
Q
  • The fluoroscopic exposure control switch is always a(n) _____ type.
    a. rheostat
    b. automatic
    c. deadman
    d. on-off
A

C

31
Q
  • The bucky slot opening in the side of the table must be automatically covered with _____ mm Pb during fluoroscopy.
    a. 1.25
    b. 1.0
    c. 0.5
    d. 0.25
A

D

32
Q
  • A cumulative timer is designed to _____ of fluoroscopy beam-on time.
    a. make the radiologist aware
    b. turn off the radiation every 5 minutes
    c. prevent more than 10 minutes
    d. shut down the system after 15 minutes
A

A

33
Q

Primary radiation is _____.

a. leakage radiation
b. the scattered beam
c. the useful beam
d. all of the above

A

C

34
Q

The intensity of scatter radiation 1 meter from the patient is approximately _____ of the intensity of the incident beam at the patient.

a. 0.01%
b. 0.1%
c. 10%
d. 50%

A

b

35
Q

At the level of the tabletop, the intensity of the fluoroscopic beam should not exceed _____ for each mA of operation at 80 kVp.

a. .02 mGy/hr
b. 0.2 mGy/hr
c. 21 mGy/min
d. 0.21 mGy/min

A

C

36
Q
  • A controlled area is one occupied primarily by _____.
    a. radiology personnel
    b. patients
    c. the general public
    d. both A and B
A

D

37
Q
  • A secondary barrier is designed to absorb _____ radiation
    a. leakage
    b. scattered
    c. primary
    d. both A and B
A

D

38
Q
  • A quantity that reflects both dose and volume of tissue irradiated is the _____.
    a. estimated skin exposure
    b. dose area product
    c. proportional region
    d. Rem
A

B

39
Q
  • The design of an uncontrolled area in radiology is based on the NCRP recommended limit of _____ mGy/yr for the public.
    a. 50
    b. 10
    c. 1
    d. 0.5
A

C

40
Q
  • Devices designed to measure total accumulated radiation intensity are called _____.
    a. dosimeters
    b. integrators
    c. scintillation detectors
    d. photo cathodes
A

A

41
Q
  • Gas-filled radiation detectors are based on the _____.
    a. thermoluminescence of crystals
    b. photoemission of electrons
    c. ionization of gas
    d. scintillation of phosphors
A

C

42
Q
  • The _____ is used for precise calibration of the output intensity of diagnostic x-ray tubes.
    a. G-M counter
    b. ion chamber
    c. scintillation detector
    d. proportional counter
A

B

43
Q
  • A Geiger-Muller counter is a(n) _____.
    a. scintillation detector
    b. optically stimulated dosimeter
    c. gas-filled detector
    d. thermoluminescent dosimeter
A

C

44
Q 
Patient dose can be reduced by using\_\_\_
I.    faster screen
II.   higher kvp
III.  increased distance
a.	I 
b.	II only
c.	II & III
d.	I, II, and III
A

a

Ch. 20 Angiography and Interventional Procedures (13 decks)

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