Quality Assurance and Fault Analysis Flashcards
What does quality assurance program cover
procedures staff training x ray equipment patient dose image processing display equipment image quality
When should digital image receptors be checked
they are reusable and therefore susceptible to wear tear and mishandling
check regularly - every 3 months
What are things to check on the digital image receptor
receptor itself
imager uniformity
image quality
What do we look or on the receptor
check for visible damage to casing/wiring
check if clean (no congealed disinfectant or saliva)
How do we check image uniformity of digital receptor
expose receptor to an unattenuated x ray beam and check if resulting image is uniform
should be consistent shade of grey
How do we check image quality of digital receptor
take a radiograph of a test object and assess the resulting image against a baseline
What does scratches on phosphor plate appear as
white lines
What does cracking from flexing the phosphor plate result in
network of white lines
What does delamination of phosphor plates result in
white areas around the edge
What is delimitation
separation of phosphor layer from base plate
If there is sensor damage to the solid state sensor what can this result in
square/straight lines
If there is damage to sensor’s blasting casing what can happen
can get damage to more delicate components and may get dead pixels
How does damage to film often present as
black marks due to sensitization of radiographic emulsion
however may appear white if emulsion is scraped off
What may marks on film represent
nail marks
bite marks
finger prints
What is a step wedge
one type of test object used to check image quality and contrast
self made or provided by manufacture
