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QC Exam > QC > Flashcards

QC Flashcards

1
Q

why is qc done

A

maintain departments standards and ensure reproducibility
-guarantees repoducibility

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2
Q

how often is qc done

A

routinely and consistent basis

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3
Q

how is type of qc determined

A

by manufactureer and user and accredidation

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4
Q

2 main accredidation agencies

A

ACR -american college of radiology
ICANL- intersocietal accredidation commission

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5
Q

what does being accreditetd do for ins coverage

A

insurance wont cover if not accredirted

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6
Q

other accredidatiosn

A

NEMA-national electrical manufacturers association
TJC, JACHO-the joint commission

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7
Q

NEMA standards

A

-devise and agree on standards for imaging
-must meet st. b4 leaving factory and upon installation

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8
Q

what accrediaition isnt prevalent in usa

A

ICANL (intersocietal commission for the accredidation of nuclear medicine labratories)

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9
Q

wht are the ACR tests

A

-intrinsic/ system uniformity
-intrinsic/ system resolution
-planar/ spect resolution
-relative sensitivity
-energy resolution
-intrinsic count rate performance
-monitor quality check
-system interlocks
-overall system performance:jayzack, COR=system alignent)

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10
Q

define qc

A

measuring instrument of some kind is tested to ensure its appropriate function

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11
Q

define qa

A

organization determines where it is accomplishing its intended function in an acceptable manner

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12
Q

is qa part of qc

A

no

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13
Q

what qc type is done daily

A

-planar qc (peaking and uniformity)
-collimator inspection

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14
Q

what qc type is done weekly/biweekly

A

-center of rotation (cor)
-high flood count
-resolution check

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15
Q

what qc type is done quarterly or annuallt

A

-tomo spatial resolution
-pixel size
-phantom
-tilt angle check (quarterly)
-collimator hole angulation (annual)

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16
Q

define uniformity

A

ability to reproduce a uniform image in reponse to a unifrom source of gamma rays

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17
Q

define sensitivity

A

ability to use gamma rays available to it

18
Q

define resolution

A

ability to reproduce the details on a non uniform source of gamma rays

19
Q

what does peaking ensure

A

that photopeak is centered in the photopeak energy window for the isotope

20
Q

how is peaking done

A

-typically intrinsically with a small amount of activity of the desired activity
-always uses radioactive source not a pt

21
Q

too much activity can result in what while peaking

A

dead time

22
Q

photopeak drifting can look like

A

blotchy

23
Q

uniformity is the cameras most

A

sensitive indicator of performance and stability
-daily flood and quanittative analysis

24
Q

how often is cua fone

A

high count flood uniformity- (CUA done biweekly)

25
Q

field uniformity is when

A

gamma camera can produce unifrom image when a source provides unifrom distribution of photons over detector
-intrinsic or extrisnisc
-consistency is key

26
Q

sources of non uniformity

A

-cracked crystal (cold region with hot rim)
-correction table error
-Co 56/58 contamination (FWHM too wide error)
-defective PMT = dark circle 2-3 x’s larger than PMT diameter)
-uncoupling of PMT from crystal : loss of light signal=bubble pattern)
-mistuning: photopeak or nuclide and photopeak not set correct (small spots)

27
Q

UFOV is

A

useful field of view
-95% exposed camera face

28
Q

CFOV is

A

center field of view
-75% of the UFOV
-concentrated of the center

29
Q

national standard and froedtert standard for tuning

A

6% national and 5% froedtert

30
Q

how to calculate UFOV and CFOV daily flood calc

A

high-low/high+low x 100

31
Q

intrinsic uniformity

A

point source without collimation

32
Q

how much do we used for source intrinsica unifomratit

A

<1 mCi

33
Q

what count rate does intrinsic uniformity degrade with

A

degrades with increasing count rate ~ 20 k cts

34
Q

source is positioned _____ times the FOV of the camera

A

5

35
Q

_____ difference in photon flux between the center and edges of FOV (may use_____ mask)

A

<1% and edge

36
Q

extrinsic uniformity

A

flat-field flood with collimation on camera

37
Q

what source used for EU

A

CO57 because Co 56 and Co 58 are impurities

38
Q

to be wary of new co 57 source

A

too hot,m longer acquisition time, expensive,h

39
Q

ow often is EU co57 source rplaces

A

~2 years and fillabek tc source used (phantom)

40
Q
A

QC Exam (1 decks)

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