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From Flashcardlet > rad bio ch 20 > Flashcards

rad bio ch 20 Flashcards

1
Q

QA deals with __

A

people

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2
Q

Program of QA monitors:

A

patient scheduling
reception
preparation

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3
Q

Quality assurance also involves image interpretation aka

A

outcome analysis

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4
Q

10 step QA program

A

assign responsibility
delineate scope of practice
identify aspects of care
identify outcomes that affect the aspects of care
establish limits of the scope of assessment
collect and organize data
evaluate care when outcomes are reached
take action to improve care
assess and document actions
communicate information to organization wide quality assurance programs

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5
Q

QC designed to ensure that the radiologist is provided with the optimal image produced through good equipment performance and resuting in minimal patient dose

A

dose

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6
Q

QC deals with ___

A

instrumentation and equipment

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7
Q

acceptable QC program consist of three?

A

acceptance testing
routine performance monitoring
maintaince

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8
Q

QC responsitly of the_____

A

physcist

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9
Q

most important patient protection characteristic of a radiographic system is ___

A

filtration of the beam

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10
Q

minimum total filtration

A

2.5 mm of all or equivalent

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11
Q

measures total filtration

A

HVL

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12
Q

filtration is measured ____

- amount

A

annually

-2.5 mm of al

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13
Q

Collimation is checked____

-tollerance

A
  • semiannually every 6 monhs

- +_ 2% SID

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14
Q

focal spot frequency

-tolerance

A
  • annually

- +_50%

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15
Q

calibration of KVP

-tolerancee

A

annually

-+_10%

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16
Q

exposure timer accurancy

-tolerance

A
  • annually

- +_5% > 10ms

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17
Q

exposure linearity

-tolerance

A
  • +_10%

- annually

18
Q

Exposure reproducibility

- tolerance

A
  • annually

- +_5%

19
Q

filtration is evaluated____or when change is done to tube or housuing

A

annually

20
Q

misalignment must not exceed ___ of SID

A

2%

21
Q

PBL collimtors

A

auto collimators that sense the size of the image receptor and adjust the collimating shutter to that size

22
Q

distance and centering indicators must be accurate to within ___% and __% of source to SID

A

2%

1%

23
Q

spatial resolution of an image system is determined by ______ of the tube

A

focal spot size

24
Q

three tools used for measurement of focal spot size

A

pinhole camera
star pattern
slit camera

25
Q

star pattern

A

focal spot sizes less than 1.3 mm

26
Q

standard for measuring effective focal spot size

A

slit camera

27
Q

focal spot should be checked ____ or when xray tube is replaced

A

annually

28
Q

acceptable alternative meausremnt for focal spot is _____ to deterime ____

A

line pair test

limitnng spatial resolution

29
Q

measured kvp should be within ___% of the indicated KVP or ____kvp

A

10%

4

30
Q

read tests from rad review book ch 15

A

read

31
Q

exposure timer accuracy should be within ____ of indicated time for exposure times greater than _____

A

5%

10 ms

32
Q

AEC provdes

A

optical density
composition
failure of reciprocity law

33
Q

assessing backup times

A

insertioatn of lead filter, if phototimer fails the backup timer should terminated 6s or 600 mas

34
Q

exposure lineartiy

A

ability of a radiographic unti to produce a constant radiation output combination of MA and Time

35
Q

exposure linearity must be within ____% for adjacent ma station

A

10%

36
Q

sequential radiation exposures should be reproducible to within ______

A

+_ 5%

37
Q

apron and gloves are checked ____

A

annually

38
Q

viewbox is checked ____ with instrument called

A

annually

photometer

39
Q

light intensity should be at least _______ and should not vary more the _____

A

1500cd/m2

+_10%

40
Q

shall is a ___

should___

A

law

recommended

41
Q

tomogram agreement between indicated sections and measure level ___

A

+__5%

42
Q

thoracic exam entrance skin dose

A

17mGya

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