15. Radiographic Imaging Artifacts Flashcards
what are image artifacts
unwanted image on the radiograph
what could artifacts do that is not desirable
may obscure anatomic info
what are the 2 types of image artifacts
technical origin (processing/IR)
patient origin (items worn by patient)
what are the 3 types of IR artifacts
dust, dirt, scratches
pixel malfunctions
ghost images
what are 3 types of software artifacts
histograms
range/scaling
image compression
what are the 3 types of object artifacts
patient positioning
collimator/partition
backscatter
what 4 technologist errors can be causes for image artifacts
patient positioning
x-ray beam collimation
histogram selection
inadequate patient preparation
what are the 3 things to be regularly documented to reduce artifact appearance
imaging frequency
imaging performance
physical condition of each IP
what happens if the CR cassette is reversed
structural components of the cassette are projected onto the IR
what is the moire pattern/effect and why does it occur
artifact demonstrated when a stationary grid is used during CR imaging and the grid frequency is similar to the laser scanning frequency
occurs when the grid frequency is closer to the CR sample frequency
scanning in the laser reading process of the CR image is achieved how
by a rotating mirror
why are ghost images created
how can they be corrected
due to incomplete erasure of a previous image on a CR IR
corrected by additional signal erasure techniques
