geometric qualities

what are the 3 components of recognizability

sharpness

magnification

shape distortion

when talking about spatial resolution, detail and the edges of an image, what recognizability factor does that refer to

sharpness

when referring to size distortion, angling, sid & oid, what recognizability factor does that refer to 

magnification

when referring to angling, alignment, fss what recognizability factor does that refer to

shape distortion

what technical factor controls receptor exposure

mas

anything that affects penetrability affects _______

subject contrast

for every 4 cm of extra tissue thickness, attenuation is ____

2x

where is the fss picked

at cathode

when you have a big part should you have a big FSS? and why

yes because mas can be 5 @ 1 second to prevent motion blur

what is line focus principle 

steep angle causes small effective focal spot while using large actual focal spot

what is pitting

when electrons hit same spot too many times

magnification is difference between size of ______object and ______ object

real

image

what are the 2 components of shape distortion

elongation, foreshortening

true or false: size distortion can affect shape distortion

false

true or false: shape distortion can affect size distortion

true

what are the 3 ways to measure unsharpness

directly

mathematically

geometrically

what are 3 factors of unsharpness

sid, oid, fss

does more or less sid have more sharpness

more

what is the formula to find unsharpness

U=FS (oid/sod)

find the unsharpness with an OID of 30cm, SOD of 70cm and a FSS of 1.2

.51

find the OID with an SID of 70 and an SOD of 50

20

what is the size of a large focal spot

1.2

what is the size of a small focal spot

.6

if blanket of scatter is removed will the sharpness still be on image?

yes

how many cm in an inch

2.54

magnification is controlled by what ratio

sid/sod ratio

what is the formula to measure ratio magnification

image size/ object size=SID/SOD

an object measuring 15cm is pictured with an SID of 50 inches and an SOD of 45 inches. how much is the image magnified ?

16.67

what is the formula to measure percent of magnification

(sid/sod-1)(100)

whats the percent of magnification with an sid of 200, sod of 150

33.33%

what are the 2 important components of resolution (image quality)

sharpness

contrast

what magnification factor controls how much the shadow is

sod