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protection > ch11,12,&15 > Flashcards

ch11,12,&15 Flashcards

1
Q

every diagnostic imaging system MUST have

A

protective tube housing & a correctly functioning control panel

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2
Q

when operating at the highest voltage leakage cannot exceed

A

100mR/hr at a distance of 1 meter (exposure rate)

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3
Q

control panel (console) must indicate

A

condition of exposure and have light or audible x ray indicator

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4
Q

absorbs only minimal amount of radiation - commonly carbon fiber

A

radiolucent

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5
Q

must have a means of measurement from anode focal spot to IR

A

SID

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6
Q

devices that limits the x ray beam before it enters a patient (pre exposure)

A

beat limiting devices- collimator

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7
Q

tight collimation will

A

decrease patient dose

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8
Q

to minimize the skin exposure, the patients skin surface should be

A

at least 15 cm below collimator for fixed equipment

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9
Q

portable units, the source to skin distance is

A

at least 30 cm

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10
Q

positive beam limitation - PBL

A

automatic collimation

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11
Q

purpose of positive beam limitation

A

is to restrict the size and shape. so it does not exceed the size and shape of the IR

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12
Q

effects of filtration

A

increase quality of the beam & decreased quantity of x rays (by absorbing some low energy beams - fewer overall beams are left)

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13
Q

2 types of filtration

A

inherent & added

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14
Q

half value layer - HVL

A

decrease the intensity of the primary beam by 1/2 (50%) of its original value

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15
Q

wedge filter

A

bone & joint - t spine, feet (thicker part towards bones)

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16
Q

trough wedge

A

(bilateral wedge) chest PA (thin center)

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17
Q

consistent output in radiation intensity for identical generator setting from one exposure to the next

A

reproducibility

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18
Q

AEC back up timer

A

is set at 150%

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19
Q

when image is shown in display

A

digital image

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20
Q

the amount of luminance (light emission) of a display monitor

A

brightness

21
Q

children - decrease kVp by

A

25% of adult kVp

22
Q

minimum filtration

A

2.5 mm total Al. equivalent permanently installed

23
Q

lead shielding

A

.25 mm lead

24
Q

cumulative timing device requirement

A

sounds at 5 mins

25
Q

fluoroscopic exposure control switch

A

must be dead man type

26
Q

c arm operator, if standing close to the patient could also receive a

A

significant increase in occupational exposure from patient scatter

27
Q

care for the whole person rather than just the area of interest

A

holistic approach to patient care

28
Q

advantages of effective communication

A

reduces patient anxiety
creates better tech/patient relationship
increases chance of completing exam & reduce repeats

29
Q

2 types of motion

A

voluntary/ involuntary

30
Q

increasing kVp by 15% and reducing mAs by half will

A

reduce radiation exposure

31
Q

technologist must not use what?

A

FGP positioning of patients - unacceptable & unethical practice

32
Q

for the pregnant patient

A

ask LMP

33
Q

occupational dose for eyes

A

150 mSv

34
Q

animal limit for members of the general population is

A

1 mSv - for continuous or frequent exposure from artificial sources

35
Q

annual occupational EfD limit of

A

50 mSv

36
Q

the most effective means of protection from ionizing radiation

A

distance

37
Q

when patient is source of radiation the lowest scatter area is

A

at 90 degrees to the patient

38
Q

standard apron thickness

A

.5 mm lead

39
Q

prevents DIRECT or un-scattered, radiation from reaching personnel or public

A

primary protective barrier

40
Q

secondary protective barrier

A

includes ceiling , control booth , & doors (1/32 inch lead)

41
Q

gloves

A

.25 mm lead

42
Q

protective eyeglasses

A

.35 mm lead

43
Q

thyroid shield

A

.5 mm lead

44
Q

bucky slot shielding device

A

at least .25 mm lead

45
Q

where should the radiographer stand during a mobile radiographic procedure

A

attempt to stand at a right angle (90 degrees) to the x ray beam - scattering object (the patient) line

46
Q

scatter radiation & leakage radiation are collectively known as

A

secondary radiation

47
Q

Workload (W)

A

used to determine barrier shield requirements

48
Q

the factor that represents the portion of beam on time that the x ray beam is directed at a primary barrier during the week

A

use factor (U)

49
Q

the order for when a patient needs held

A

male relative
female relative
non - radiology personnel
radiology personnel

protection (2 decks)

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