Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Mammo > Quality Control > Flashcards

Quality Control Flashcards

1
Q

flat field uniformity

A

an analysis of the homogeneity of the detector field

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

MTF (modulation transfer function)

A

measure of image sharpness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

CNR (contrast to noise ratio)

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

SNR (signal to noise ratio)

A

compares the level of the desired signal to the level of background noise. high SNR= better image

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

contrast resolution

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Purpose of phantom image quality

A

Assure image quality due to xray imaging system is at optimum level

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Frequency of phantom image quality

A

Weekly for digital manufacturers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Equipment and procedure of phantom image quality

A

-24x30 cm compression paddle, ACR phantom and 4.0mm thick x 1.0 cm diameter acrylic disk
-make sure filter/kVp selection is done at a thickness of 4.5 cm
-mAs value is determined by a short pre-exposure in AEC mode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Performance criteria of phantom image quality

A

-mAs plus/minus 15%
-optical density 1.40 and higher
-density difference
-phantom must be scored with 2 fibers, 3 speck groups, and 2 masses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Correction action for phantom image quality

A

Must pass to do clinical images. Immediate action to fix errors or problems before any clinical images are obtained

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Purpose of compression thickness indicator

A

Make sure the indicated thickness is within tolerance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Frequency of compression thickness indicator

A

Monthly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Equipment and procedure of compression thickness indicator

A

-2 1 inch tape rolls 4-6cm thick
-Phantom/spot paddle
-compress about 15 lbs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Performance criteria of compression thickness indicator

A

Within +/- 0.5 cm of accurate thickness is within tolerance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Corrective action of compression thickness indicator

A

Failure must be corrected within 30 days

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Purpose of visual checklist

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Frequency of visual checklist

A

Monthly (around same time), after service, and upon instillation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Equipment and procedure of visual checklist

A

Self assessment of testing and looking at all the parts listed to assess for good condition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Performance criteria of visual checklist

A

All parts of the machine and performance of machine is in good working order and passes/fails

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Correction action of visual checklist

A

Critical items visualized must be fixed before clinical use, but less critical item fixed within 30 days

21
Q

What are the critical items in the visual checklist?

A

-cleaning solution
-all locks work correctly
-paddles and face shields have no cracks
-breast support no cracks or defects
-CR must hold and lock cassettes
-CR IP free of cracks and latches work properly
-CR IP should load into CR reader smooth

22
Q

Purpose of acquisition and radiologist workstation monitors

A

Ensure free of any marks that can interfere with clinical information, make sure monitors are calibrated, and meet manufacturers specification

23
Q

Frequency of acquisition and radiologist workstation monitors

A

Monthly

24
Q

Equipment and procedure of acquisition and radiologist workstation monitors

A

Cleaning lint free cloth and possible monitor cleaning solution and monitor manufacturer automated test

25
Q

Performance criteria of acquisition and radiologist workstation monitors

A

SMPTE test pattern

26
Q

Correction action of acquisition and radiologist workstation monitors

A

Problems need to be fixed within 30 days, more severe defects problems need to be fixed before any clinical images are performed

27
Q

Purpose of acquisition and radiologist workstation monitors; monitor cleanliness

A

Ensure viewing conditions for the radiologist are to the full potential without degrading the images on the monitor

28
Q

Frequency of acquisition and radiologist workstation monitors; monitor cleanliness

A

Once a day or when images are going to be read

29
Q

Equipment and procedure of acquisition and radiologist workstation monitors; monitor cleanliness

A

-Cleaning agents that do not attack the surface, such as petroleum (mineral) spirits
-do not apply cleaning liquid directly to the monitor housing or screen (dampen cloth sparingly)

30
Q

Mammographer tests acquisition and radiologist workstation monitors; monitor calibration and test pattern

A

-SMPTE is performed to check communication between the entities of the detector, printer and monitors. All have to communicate with each other
-task group from American Association of physicist in medicine (AAPM) created a TG-18 SMPTE pattern for a more advanced monitor testing
-TG-task group and 18 stands for the test patterns on the test to check the performance of the monitor’s calibration and visual inspection

31
Q

Mammographer tests acquisition and radiologist workstation monitors; monitor extra information

A

-minimum luminance L-min of grayscale monitors @least 250 cd/m^2
-maximum luminance L-max of grayscale monitors @ no more than 420-450 cd/m^2
-reflected ambient light from the display surface should be included in luminance measurement
-min of 8 bit luminance resolution (bit depth) is required
-two monitor portrait set up
-GSDP: gray scale display function

32
Q

Purpose of repeat analysis test

A

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 pt exposure

33
Q

Frequency of repeat analysis test

A

Performed as much as needed, but needs to have 250 exams or equals a 1000 images

34
Q

Equipment used for repeat analysis test

A

Machine computer software and calculator

35
Q

Performance criteria of repeat analysis test

A

Is from one quarter to the next, the repeat rate % cannot change more than 2%. If so, must be documented why

36
Q

Corrective action of repeat analysis test

A

30 days to correct problems with the department/tech such as remedial positioning, compression, quality education with counseling

37
Q

Mammographer tests viewing conditions

A

-each room has a data form that is filled out by the medical physicist for the room configuration
-The medical physicist looks at the normal value of the ambient light in the room and measures it.
-if changes are made in the room, such a small lamp, new doors, room, curtains, blinds

38
Q

Mammographer tests viewing conditions part 2

A

-ambient lights should not be turned off completely, nor turned up completely
-20 lux is generally sufficient and is the recommendation for low, 45 to 50 lux is maximum in reading room

39
Q

Mammographer tests viewing conditions part 3

A

-Clean view boxes weekly
-general radiography view box luminance level 1,500 candela (nit) so half as strong as mammography
-mammography view box luminance level 3,000 candela (nit)
-change bulbs every 18-24 months
-bulbs increase in brightness about 10% in 2,000 hours. Replace all bulbs

40
Q

Purpose of compression force test

A

-assure that the mammography system can provide adequate compression and power driven and manual mode and that the equipment does not allow too much compression to be applied Damaging patient’s breast tissue. Test the mechanism of the equipment.

41
Q

Frequency of compression force test

A

-initial installation of machine
-every 6 months/semiannually

42
Q

Equipment of compression force test

A

-Analog bathroom scale or dedicated physicist measurement scale
-towels to help to prevent scratches on equipment

43
Q

Performance criteria of compression force test

A

-minimum measure of 25lbs and maximum measurement of 45lbs of pressure

44
Q

Corrective action of compress force test

A

Source of the problem shall be identified and corrective action shall be taken before any clinical use

45
Q

Purpose of manufacturer detector calibration

A

Assure that the system is calibrated properly and to erase artifacts and errors

46
Q

Frequency of manufacturer detector calibration

A

Once a week for majority of manufacturers

47
Q

Equipment of manufacturer detector calibration

A

Flat field phantom 4 cm thick uniform attenuation block of acrylic large enough to cover FOV

48
Q

Performance criteria of manufacturer detector calibration

A

Make multiple exposures with each filter and standard and magnification modes and pass calibration checks

49
Q

Corrective action of manufacturer detector calibration

A

If there is any failures must correct errors before any clinical images are performed

Mammo (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions