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Quality Control > Week #7 Review > Flashcards

Week #7 Review Flashcards

1
Q

An xray tube and image intensifier attached in a C configuration

A

C-arm/base

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2
Q

Offers both static and dynamic imaging during the procedure

A

Display monitors

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3
Q

What power source do mobile xray units most commonly have?

A

Capacitor discharge generators or battery powered

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4
Q

-Operates by charging a series of silicon-controlled rectifiers from the DC voltage of a nickel-cadmium battery or a wall
-by electrically stacking the SCRs the charge is stored at a very high voltage
-during exposure the charge is released

A

Capacitor Discharge models

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5
Q

What is a disadvantage to the capacitor discharge models?

A

The capacitor may continue to discharge after the usable exposure, which can create radiation leakage

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6
Q

Generators in these units produce output that is essentially high frequency

A

Battery powered cordless models

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7
Q

-Powered by 10 to 16 rechargeable, sealed, lead acid type 12-volt batteries connected in series
-equipped with circuitry to monitor battery strength

A

Battery powered cordless models

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8
Q

According to SC35, how far from the mobile xray unit must the tech be if not wearing ppe?

A

3 metres

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9
Q

-consists of two perpendicular sets of ceiling mounted rails
-attached to the xray tube by a telescoping column
-detents

A

Ceiling support system

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10
Q

-has a single column with rollers at each end
-the xray tube slides up and down the column as the column rotates

A

Floor to ceiling support system

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11
Q

-has a single column positioned on one or two floor mounted rails

A

Floor support system

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12
Q

-one end of the c arm is connected to an xray tube
-the other end is connected to the image receptor
-may be ceiling or floor mounted

A

C-arm support system

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13
Q

What is the radiation limit for a controlled area?

A

20 mSv per year

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14
Q

What is the radiation limit for an uncontrolled area?

A

1 mSv per year

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15
Q

The immediate area where xray equipment is used such as the procedure room and xray control booths

A

Controlled area

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16
Q

Areas occupied by individuals such as patients, visitors to the facility, and employees who do not work routinely with or around radiation sources

A

Uncontrolled area

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17
Q

What is the radiation limit in a controlled area with a radiation sensitive population?

A

0.30mSv per year

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18
Q

What is the standard for control booth shielding?

A

No operator is occupationally exposed to more than 0.4mSv/week

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19
Q

Provides shielding from the direct xray beam and therefore must be placed in such an orientation as to intersect the xray beam
Ex. Wall behind vertical IR

A

Primary protective barrier

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20
Q

Provide shielding from scattered and leaked X-rays
Ex. Ceiling

A

Secondary protective barriers

21
Q

The xray tube should never be directed towards the control booth
(These walls are considered secondary barriers)

A

True

22
Q

A measure of the operational time or the amount of use of the xray equipment over a set period of time

A

Maximum workload (W)

23
Q

The fraction of time that the area under consideration is occupied by the individual who spends the most time at that location while the xray equipment is operating

A

Occupancy factor (T)

24
Q

Admin offices, attended waiting rooms, adjacent xray rooms, image viewing areas, xray control rooms…

A

T=1

25
Q

Rooms used for patient exam and treatment

A

T=1/2

26
Q

Corridors, patient rooms, staff lounges…

A

T=1/5

27
Q

Corridors doors

A

T=1/8

28
Q

Public toilets, unattended waiting areas…

A

T=1/20

29
Q

Outdoor areas, stairways, janitors closets….

A

T=1/40

30
Q

The fraction of the workload during which the xray beam is pointed in the direction under consideration

A

Use factor (U)

31
Q

Floors of radiation rooms, walls routinely exposed to direct radiation….

A

Primary barrier
U=1

32
Q

Doors, walls of radiation room not routinely exposed to direct radiation…

A

Primary barrier
U=1/4

33
Q

Ceiling area of radiation rooms not routinely exposed to direct radiation

A

Primary barrier
U=1/16

34
Q

Use factor for secondary protective barriers (ex. Control booth)

A

U=1
*always taken to be 1

35
Q

Threshold of feeling, tingling sensation

A

1ma

36
Q

Accepted as maximum harmless current

A

5ma

37
Q

Beginning of sustained muscular contraction

A

10-20ma

38
Q

Ventricular fibrillation, fatal if continued. Respiratory function continues

A

100-300ma

39
Q

Sustained ventricular contraction followed by normal heart rhythm. Temporary respiration paralysis and possibly burns

A

6 A

40
Q

What do product standards seem to be these upper limit for children and adults?

A

4-6ma

41
Q

What happens as the resistance of the skin is broken down by electrical current?

A

Resistance drops and current levels increase

42
Q

What currents are considered less dangerous at lower voltage?

A

DC Currents

43
Q

What are the 3 current pathways through the body?

A

-Touch potential
-step potential
-touch/step potential

44
Q

The smaller the area of contact the greater the heat produced

A

True

45
Q

Devices used in electrical systems to prevent against excess current

A

Fuse

46
Q

Open a circuit as current climbs to an unsafe level

A

Circuit breakers

47
Q

What are Ground Fault Circuit Interrupters designed for?
(GFCI)

A

To protect people from electric shock rather than prevent damage to a buildings wiring

48
Q

What is the minimum depth of a conductive pipe or rod for an earth ground?

A

8 feet
(Water pipes are commonly used)

Quality Control (3 decks)

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