ch11 geometric factors affecting RD

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recorded detail

sharpness of the lines of the image

good recorded detail

sharp lines

poor recorded detail

fuzzy or blurry edge around lines

recorded detail also referred to as...

sharpness
spatial resolution
detail

another term for spatial resolution

digital imaging recorded detail

spatial resolution determined by...

matrix size, pixel size, and gray scale bit depth

7 factors affecting recorded detail

SID, OID, Focal Spot Size
Screen & Film speed, Contact of screen & film
Motion (stat orders from surgery follow cutting mistakes)

properties of image visibility

photographic properties - density and contrast

properties of image sharpness

geometric properties - distortion and recorded detail

visibility of detail is controlled by...

everything that affects density, contrast, and distortion

define visibility of detail

overall quality of the finished radiograph; term used to describe how well the image is seen

resolution

measurement of recorded detail;
ability of an imaging system to record 2 adjacent structures as separate structures

resolution grid

device used to measure resolution; flat piece of metal with slits cut into it

line pair

one metal line & slit or space next to it

unit of measurement for line pairs

line pairs per millimeter (lp/mm)

edge gradient

term that describes the amount of recorded detail; refers to how sharp the edge of an object is on film

what happens to recorded detail when edge gradient increases?

recorded detail increases

what happens to recorded detail when unsharpness increases?

recorded detail decreases

unsharpness

borders of a fine structure are not optimally seen

penumbra

blur, unsharpness, imperfect, unsharp shadowing surrounding umbra

umbra

main part of the image; distinctly sharp area of a shadow

geometric factors that affect RD

focal spot size, OID, SID

what happens to RD when focal spot size increases?

RD decreases

what is relationship between focal spot size and RD?

indirectly proportional

true or false. a small OID produces better recorded detail

true

what happens to RD when OID is increased?

decreased

relationship between OID and RD

indirectly proportional

what happens to penumbra and resolution as SID increases?

penumbra reduced, resolution increases

increasing source to image receptor distance does what to amount of geometric unsharpness?

decreases

true or false. a small SID produces better RD

false

increased SID does what to RD?

increased, thus directly proportional

recorded detail & size distortion are affected by what?

SID & OID

as distortion increases, what happens to RD and what is relationship?

RD decreases, thus inversely related

film and screen are classified by..

speed

a slow speed/ screen system will demonstrate what resolution quality than a faster one?

better resolution

relationship between screen speed and RD

inversely related

unsharpness formula

u = focal spot size x OID/ SOD
note: SOD = SID - OID

recorded detail improves with what?

small focal spot size, short OID, long SID

radiographs show more unsharpness with what?

large focal spot, long OID, short SID

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