QA 5

daily qc

PSP not used in 48 hrs are erased

Artifacts

Clean CR/DR detectors

Inspect for damage

Verify interface operation

Record image retakes

Check laser printers (brightness & contrast w no artifacts)

monthly qc

Erase PSP plates

Evaluate for dark noise

Acquires QC phantom images

Calibrate monitors

quarterly test

clean & inspect plates

preform tests: resolution, contrast, noisse, laser jitter, EI

annual qc

acceptance

review test data & service reports

pt exp records & dose creep

reports & improvements

what does laser printer test eval for

density contrast

what does Image erasure test do

confirms PSP is erased by white light within plate reader's erasure area

dark noise definition

residual signals from bg rad on unexposed cassette

what does dark noise do to an image

lowers contrast & brightness

linearity response def

measure pixel values produced by 3 diff exp at diff lvls of rad

relationship of linearity response

Should demon linear relationship w changes in lvls of exp to receptor

what is EI calibration for

monitoring pt exp for psp receptors

why is EI calibration needed

to receive accurate pt dose

what does laser jitter test

Transport system of PSP plate reader evaluated AND how laser beam interacts w PSP plates

what does laser jitter test display

wavy band perpendicular to the direction of travel

what does laser jitter test use

metal ruler/T-bar processed

what is measured in brightness uniformity & what is the variance

pixel values; 10%

what does high contrast res test use & why

Resolution grid used to see small lines & spat res at a high contrast lvl

what is used for distortion assessment

wire mesh screen; spacing used to determine distortion

what is anti-aliasing

When laser sampling freq of PSP plate reader & anti scatter grid freq match, & creates a moire artifact

how is linearity response shown

plotted pixel values to compare exp lvl of exp

how does image retention happen in DR

when DEL doesn't return to 0 after an exp

what is used to test blurring/stitching artifacts

fine wire mesh used

how is noise/low contrast res tested in DR

eval images of leeds low contrast test phantom

what does blurring/stitching artifacts assess

localize blurring/stitching issues w individual DELs

what qualities can be assessed when using the leeds phantom test

noise & low contrast res