QC

Question 1

an analysis of the homogeneity of the detector field

Answer 1

flat field uniformity

Question 2

a measure of image sharpness

Answer 2

modulation transfer function MTF

Question 3

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

Answer 3

contrast to noise ratio CNR

Question 4

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

Answer 4

signal to noise ratio SNR

Question 5

a higher signal to noise ratio SNR provides a _____ image

Answer 5

better

Question 6

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

Answer 6

contrast resolution

Question 7

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

Answer 7

phantom image quality

Question 8

frequency of phantom image QC

Answer 8

weekly

Question 9

phantom image QC performance criteria
mAs=
optical density=

Answer 9

15%
1.40 and higher

Question 10

correction action of phantom image QC

Answer 10

must pass to do clinical images; immediate action

Question 11

phantom image QC
full point for fiber=

Answer 11

> =8mm

Question 12

phantom image
3 test objects

Answer 12

fibers
speck groups
masses

Question 13

phantom image
number of fibers, speck groups and masses

Answer 13

6,6,6

Question 14

phantom image must score:

Answer 14

2 fibers, 3 speck groups, 2 masses

Question 15

purpose is to make sure the indicated thickness is within tolerance

Answer 15

compression thickness indicator

Question 16

frequency of compression thickness indicator

Answer 16

monthly

Question 17

compression thickness indicator QC-
how many pounds of compression

Answer 17

15

Question 18

compression thickness indicator performance criteria- must be accurate within

Answer 18

0.5cm

Question 19

compression thickness indicator corrective action

Answer 19

must be corrected within 30 days

Question 20

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

Answer 20

visual checklist

Question 21

frequency of visual checklist

Answer 21

monthly

Question 22

corrective action of visual checklist

Answer 22

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

Question 23

3 critical items on the visual checklist

Answer 23

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

Question 24

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

Answer 24

acquisition and radiologist workstation monitor QC

Question 25

frequency of acquisition and radiologist workstation monitor QC

Answer 25

monthly

Question 26

acquisition and radiologist workstation monitor QC test pattern

Answer 26

society of motion picture and television engineers SMPTE

Question 27

corrective action for acquisition and radiologist workstation monitors

Answer 27

within 30 days

Question 28

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

Answer 28

acquisition and radiologist workstation monitor cleanliness

Question 29

frequency for acquisition and radiologist workstation monitor cleanliness

Answer 29

once a day

Question 30

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

Answer 30

SMPTE

Question 31

acquisition and radiologist workstation monitors minimum luminance resolution

Answer 31

8 bit

Question 32

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

Answer 32

repeat analysis QC

Question 33

frequency of repeat analysis

Answer 33

as much as needed; quarterly

Question 34

performance criteria of repeat analysis

Answer 34

below 2%

Question 35

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

Answer 35

compression force

Question 36

frequency of compression force

Answer 36

semiannually

Question 37

performance criteria of compression force QC in lbs

Answer 37

25-45

Question 38

corrective action for compression force QC

Answer 38

before clinical use

Question 39

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

Answer 39

manufacturer detector calibration

Question 40

frequency of manufacturer detector calibration

Answer 40

weekly

Question 41

equipment needed for manufacturer detector calibration

Answer 41

flat field phantom

Question 42

corrective action for manufacturer detector calibration

Answer 42

before clinical use

Question 43

to make sure the images are free of undesirable artifacts

Answer 43

artifact evaluation

Question 44

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

Answer 44

SNR and CNR QC