Recorded Detail - Distortion Flashcards
what is recorded detail?
(sharpness) with which anatomic structures are created on an image
what is the major controlling factor of detail?
FSS
if you have a larger focal spot size, what happens to detail?
detail decreases
if you increase body habitus, what happens to detail?
why?
detail decreases
higher OID causes increased magnification
if you increase OID, what happens to detail?
why?
detail decreases
increasing magnification
if you increase SID, what happens to detail?
why?
detail increases
decreasing magnification
if you increase screen speed, what happens to detail?
why?
detail decreases
increased size of phosphors in screen gives less detail
what is distortion
any misrepresentation of true size and shape of an object
what are the 2 types of distortion?
size
shape
what is size distortion?
magnification
what 2 things cause size distortion?
excessive OID
insufficient SID
what is shape distortion
misrepresentation of the true shape of an object
what are the 2 types of shape distortion?
elongation
foreshortening
what causes elongation?
angle of rube/IR
what causes foreshortening?
angle of part
