Image Production

Question 1

n bits =

Answer 1

2^n values

Question 2

grey level quantisation

Answer 2

G=2^n
n is usually 8 giving us 256 grey levels from 0 to 255
grey levels determine quality of image

Question 3

high contrast=

Answer 3

low latitude

Question 4

contrast

Answer 4

the difference between exposures

Question 5

exposure

Answer 5

x-ray photons

Question 6

flat panel detectors indirect placed

Answer 6

in intimate contact with an active matrix array

Question 7

flat panel detectors indirect xrays converted

Answer 7

to light photons charge stored in each pixel element

Question 8

flat panel detectors indirect magnitude of charge in each pixel

Answer 8

is the latent image

Question 9

flat panel detectors indirect matrix array

Answer 9

read out

Question 10

flat panel detectors direct photoconductive material

Answer 10

amorphos silicon or amorphos selenium

Question 11

flat panel detectors direct interacting xrays produce

Answer 11

charge which is attracted to the electrode and the capacitive storage element

Question 12

flat panel detectors direct

Answer 12

• capacitive storage element added to store charge
• active matrix array is read out