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safety continued Flashcards

1
Q

:The tabletop exposure rate during fluoroscopy shall not exceed

A
10 mGya/min/mA

B
21 mGya/min/mA

C
10 mGya/hr

D
5 R/h

A

b

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2
Q

Which of the following radiation exposure responses exhibit a nonlinear threshold dose-response relationship?

  1. Skin erythema
  2. Hematologic depression
  3. Lethality

A
1 only

B
1 and 2 only

C
2 and 3 only

D
1, 2, and 3

A

d

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3
Q

Which of the following would be most likely to cause the greatest skin dose (ESE)?

A
Short SID

B
High kilovoltage

C
Increased filtration

D
Decreased milliamperage

A

a

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4
Q

Radiation output from a diagnostic x-ray tube is measured in which of the following units of measurement?

A
Gyt

B
Sv

C
Gya

D
Bq

A

c

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5
Q

The most efficient type of male gonadal shielding for use during fluoroscopy is

A
flat contact

B
 shaped contact (contour)

C
shadow

D
cylindrical

A

b

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6
Q

What quantity of radiation exposure to the reproductive organs is required to cause temporary infertility?

A
1000 mGy

B
2000 mGy

C
3000 mGy

D
4000 mGy

A

What quantity of radiation exposure to the reproductive organs is required to cause temporary infertility?

A
1000 mGy

B
2000 mGy

C
3000 mGy

D
4000 mGy

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7
Q

Increasing the voltage on the electrostatic lenses within the Image Intensifier of an ABS equipped fluoroscopic system will result in:

A
Increased brightness gain

B
Increased flux gain

C
Increased magnification

D
Decreased patient dose

A

c

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8
Q

Which of the following is most likely to require the lowest patient exposure?

A
Decreasing kilovoltage by 15% and doubling the milliampere-seconds value

B
Increasing kilovoltage by 15% and cutting the milliampere-seconds value in half

C
Changing collimation from 10 × 12 to 14 × 17

D
Changing from an 8:1 grid technique to nongrid

A

d

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9
Q

Moving the image intensifier closer to the patient during traditional fluoroscopy
decreases the SID
decreases patient dose
improves image quality

A
1 only

B
1 and 2 only

C
1 and 3 only

D
1, 2, and 3

A

d

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10
Q

How much protection is provided from a 100-kVp x-ray beam when using a 0.50-mm lead-equivalent apron?

A
40%

B
75%

C
88%

D
99%

A

b

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11
Q

What is the relationship between kV and HVL?

A
As kV increases, the HVL increases.

B
As kV increases, HVL decreases

C
If the kV is doubled, the HVL doubles.

D
If the kV is doubled, the HVL is squared.

A

a

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12
Q

Personnel present in the x-ray room during fluoroscopic examinations wear lead aprons to protect them primarily from

A
photoelectric scatter.

B
Compton scatter.

C
pair production.

D
magnetic fringe field.

A

b

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13
Q

Which of the following is most likely to result in the greatest increase in patient exposure?

A
Changing from 100 mA to 200 mA

B
Increasing kV 15% and cutting mAs in half

C
Decreasing the kV 15% and doubling the mAs

D
Changing from nongrid technique to 8:1 grid technique

A

d

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14
Q

The measure of the rate at which energy is transferred from ionizing radiation to soft tissue is termed

A
the characteristic effect

B
Compton scatter

C
linear energy transfer

D
the photoelectric effect

A

c

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15
Q

Under what circumstances might a radiographer be required to wear two dosimeters?
During pregnancy
While performing vascular procedures
While performing mobile radiography

A
1 and 2 only

B
2 only

C
2 and 3 only

D
1, 2, and 3

A

a

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16
Q

Which of the following terms refers to the number of x-ray examinations performed weekly?

A
Use factor

B
Workload

C
Time of occupancy factor

D
Controlled area

A

b

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17
Q

Federal law requires that all occupationally exposed individuals are issued dosimeters for monitoring purposes. Occupationally exposed personnel describes any individual employed in a role in which they are likely to receive what percentage or more of the annual effective dose limit of 50 mSv in the performance of their duties?

A
5%

B
10%

C
1%

D
20%

A

b

18
Q

What’s the word frequency list radiographic equipment be checked for linearity and reproducibility

A

Annually

19
Q

Which of the following is/are components of the secondary or high voltage side of the x-ray circuit

A. Rectification system
B auto transformer
C kv meter

A

A only

20
Q

Design characteristics x-ray to target to determine the heat capacity include

1 the rotation of the anode
2 the diameter of the Anode
3 size of the focal spot

A 1 only
B1,2
C 1,2,3

A

C

21
Q

When using the smaller field in a dual field image intensifier
1 the image is magnified
2 the image is brighter
3 a larger atomic area is viewed

A 1
B 1 3
C 2 3
D 1 2 3

A

A

22
Q

Which of the following system functions to compensate for changing patient particular start fluoroscopy procedures
A automatic break his control
B Modification gain
C Automatic resolution control

A

A

23
Q

Which of the following combinations would pose the least heat hazard to a particular single phase anode

A 1.2 mm focal spot, 92 kv, 1.5 mAs
B .6 mm focal spot, 80 kv 3 mas
C 1.2 mm focal spot, 70 kv 6mas
D .6 mm focal spot 60 kv 12 mas

A

A low mas, high KVP large focal spot

24
Q

what is the relationship between kv and HVL

A

as kv increases HVL increases

25
Q 
circuit devices that permit electrons to flow in only one direction are 
a solid state diode 
b resistors 
c transformors 
d autotransforers
A

a) solid state diode rectifers

26
Q 
a slit camera is used to measure 
1. focal spot size 
2. spatial resolution 
3 dynamic range 
a 1
b 1,2
c 1,3
d 1,2,3
A

b

27
Q 
the advantages of collimators over aperture diaphragms and flare  cones include 
1 the varity of ield sizes 
2 more effiecent beam restriction 
3 beam cleanup of scattered radiation 
a 1 
b 1 2 
c 1 3 
d 2,3
A

b

28
Q 
the type of x ray tube design to turn on and off rapilfy, providing multiple short, precise exposures is 
a. high speed 
b grid controlled 
c diode 
d electrode
A

b grill controlled

29
Q 
the device that receives the remnant beam and converts it into light and the increases the brightness  of that light is 
a ccd 
b spot image device 
c image intensifier 
d television monitor
A

a) image intensifier

30
Q

components of digital imaging include

  1. computer manipulation of the image
  2. formation of an electronic image on the radiation detector
  3. formation of an x ray image directly on the IR

a. 1
b 1 2
c 2 and 3
d 1,2,3

A

b 1 and 2

31
Q 
which of the following is used in digital fluoroscopy , replacing the image intensifiers televion camera tube 
a solid state diode 
b ccd 
c photostimulable phosphor 
d vidicon
A

b) ccd

32
Q

which of the following us used to control voltage by varing resistances

a. autotransformer
b. high voltage transformer
c. rheostat
d. fuse

A

c. rheostat

33
Q

which of the following contributes to inherent filtration

  1. x ray tube glass envelope
  2. x ray tube port window
  3. aluminum between the tue housing and the collimaotr

a. 1
b. 1,2
c. 1 and 3
d 1,2,3

A

b 1 and 2

34
Q

all the following x ray circuit deceives are located between the incoming power supply and the primary coil of the high voltage transformer

a. the timer
b. the kv meter
c. the ma meter
d. the autotransformer

A

c

35
Q 
the kv settings on radiographic equipment must be tested annually and must be accurate to within
a. -+2 kv 
b -+4 kv 
c -+6 kv
d -+8 kv
A

b

36
Q 
to maintain image clarity in an image intensifer system the path of electron flow from the photocathode to the output phosphor is controlled by 
a. accelerating anode 
b electrostatic lense 
c the vacuum glass envelope 
d the input phosphor
A

b) electrostatic lense

37
Q 
a device used to ensure reproducible radiographs regardless of tissue density variations is the 
a. aec 
b. penetrometer 
c grid device 
d induction motor
A

a) aec

38
Q

the brightness level of the fluroscopic image can vary with

  1. millamperage
  2. kv
  3. patient thickness

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

A

d 1 2 3

39
Q 
which of the following functions to increase the ma 
a. increase in charge of the anode 
b. increase the filament 
c increase kv 
d increase in focal spot size
A

c increase kv

40
Q

which of the following will offer the greatest heat loading capability

a. 17 degree angle 1.2 mm actual focal spot
b. 10 degree angle 1.2 mm actual focal spot

A

b

41
Q

the absorption of useful radiation by a grid is called

A

grid cut off

42
Q

which of the following will mot likely produce the highest quality radiographic image
a. high snr
b. low snr
c low contrast resolution

A

a. high snr

boards safety (2 decks)

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