Image Noise - Image Blur - Artifacts Flashcards
what is image noise?
deterioration of the radiographic image by unwanted interference in x-ray signal detection
what are the 3 types of image noise?
electronic
quantum
scatter/fog
what is quantum noise?
insufficient signal strength
what should you do if there is quantum noise?
increase mAs
as detector exposure decreases, what happens to image noise?
image noise increases
what is an artifact?
a distortion or error in an image that is not related to the subject being studied
what are the 4 types of artifact?
image receptors
processing
software
exposure
what are the 2 types of image receptor artifacts?
cassette based
cassette-less
what is image blur?
unfocused image
what are the 3 types of image blur?
receptor
geometric
motion
what is receptor blur?
when the cause is within any receptor (phorphors or DELs)
what factors are involved with geometric blur?
OID, SID, FSS
