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mammo > QC > Flashcards

QC Flashcards

1
Q

an analysis of the homogeneity of the detector field

A

flat field uniformity

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2
Q

a measure of image sharpness

A

modulation transfer function MTF

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3
Q

a measure of the detectors ability to distinguish differences between an objects signal in the image and the image noise corruption

A

contrast to noise ratio CNR

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4
Q

compares the level of the desired signal to the level of background noise

A

signal to noise ratio SNR

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5
Q

a higher signal to noise ratio SNR provides a _____ image

A

better

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6
Q

the ability of an imaging system to distinguish similarities of objects in an image

A

contrast resolution

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7
Q

purpose is to assure image quality due to xray imaging system is at optimum level

A

phantom image quality

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8
Q

frequency of phantom image QC

A

weekly

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9
Q

phantom image QC performance criteria
mAs=
optical density=

A

15%
1.40 and higher

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10
Q

correction action of phantom image QC

A

must pass to do clinical images; immediate action

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11
Q

phantom image QC
full point for fiber=

A

> =8mm

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12
Q

phantom image
3 test objects

A

fibers
speck groups
masses

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13
Q

phantom image
number of fibers, speck groups and masses

A

6,6,6

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14
Q

phantom image must score:

A

2 fibers, 3 speck groups, 2 masses

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15
Q

purpose is to make sure the indicated thickness is within tolerance

A

compression thickness indicator

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16
Q

frequency of compression thickness indicator

A

monthly

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17
Q

compression thickness indicator QC-
how many pounds of compression

A

15

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18
Q

compression thickness indicator performance criteria- must be accurate within

A

0.5cm

19
Q

compression thickness indicator corrective action

A

must be corrected within 30 days

20
Q

purpose is to assure that the mammographic xray system indicator lights, displays, and mechanical locks and detents are working properly and that the system is mechanically safe

A

visual checklist

21
Q

frequency of visual checklist

A

monthly

22
Q

corrective action of visual checklist

A

critical items-fixed before clinical use
less critical items-fixed within 30 days

23
Q

3 critical items on the visual checklist

A

cleaning solution, locks working, paddles/face shield have no cracks, breast support has no cracks

24
Q

purpose is to ensure free of any marks that can interfere with clinical info, make sure monitors are calibrated and meet manufacturers specs

A

acquisition and radiologist workstation monitor QC

25
Q

frequency of acquisition and radiologist workstation monitor QC

A

monthly

26
Q

acquisition and radiologist workstation monitor QC test pattern

A

society of motion picture and television engineers SMPTE

27
Q

corrective action for acquisition and radiologist workstation monitors

A

within 30 days

28
Q

purpose is to ensure viewing conditions for the radiologist are to the full potential without degrading the images on the monitor

A

acquisition and radiologist workstation monitor cleanliness

29
Q

frequency for acquisition and radiologist workstation monitor cleanliness

A

once a day

30
Q

performed to check communication between the entities of the detector, printer and monitors.

A

SMPTE

31
Q

acquisition and radiologist workstation monitors minimum luminance resolution

A

8 bit

32
Q

purpose to determine the number and cause of repeated digital mammograms. analysis of this data can help identify ways to improve system efficiency and reduce digital retakes and patient exposure

A

repeat analysis QC

33
Q

frequency of repeat analysis

A

as much as needed; quarterly

34
Q

performance criteria of repeat analysis

A

below 2%

35
Q

purpose is to assure that the mammographic system can provide adequate compression in power driven and manual modes and that the equipment does not allow too much compression to be applied damaging patients breast tissue

A

compression force

36
Q

frequency of compression force

A

semiannually

37
Q

performance criteria of compression force QC in lbs

A

25-45

38
Q

corrective action for compression force QC

A

before clinical use

39
Q

purpose is to assure that the system is calibrated properly and to erase artifacts and errors

A

manufacturer detector calibration

40
Q

frequency of manufacturer detector calibration

A

weekly

41
Q

equipment needed for manufacturer detector calibration

A

flat field phantom

42
Q

corrective action for manufacturer detector calibration

A

before clinical use

43
Q

to make sure the images are free of undesirable artifacts

A

artifact evaluation

44
Q

to ensure that the image quality of the system is maintained at optimal levels

A

SNR and CNR QC

mammo (13 decks)

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