FINAL TQ PART V

Question 1

with digital imaging, the main change is what? in other words, digital imaging is equal to _____?

Answer 1

image receptor

*no longer film based

Question 2

for radiographic image capture, what are the two types?

Answer 2

analog and digital

Question 3

digital uses what two types?

for the indirect part, scintillator converts x-ray photons to _____? the photodetector converts light proportionally t0 _____?

Answer 3

indirect/direct systems

light
electrical signals

Question 4

all office based systems are _____? (what type of computed radiography, direct/indirect)

Answer 4

indirect

Question 5

what are the similarities between CR and screen film receptor imaging?

Answer 5

both use image receptors

both use scintillator plates

either used interchangeably with any x-ray imaging sys

both carry a latent image

Question 6

CR converts IR laser light to _____?

Answer 6

photostimulable phosphor (PSP) via Ergot

Question 7

computed radiography contains a K-edge that attenuates best between what ranges?

Answer 7

35 & 50 KeV

Question 8

what percent of PSP retains energy? what does this equal?

Answer 8

50%

latent image

Question 9

what is important to note about laser scanning of the CR plate?

Answer 9

amount of light released proportional to amount of x-ray energy trapped

Question 10

T/F, if x-ray unit and processor are in the same room, than exposure will interfere with laser scanning?

Answer 10

T

Question 11

is digital imaging as sharp as film?

Answer 11

NO

Question 12

spatial is good or bad in digital? contrast?

Answer 12

bad

good

Question 13

name this defn?

the ability of the system to resolve a small high contrast object

Answer 13

spatial resolution

Question 14

how quickly does image degrade of the CR vs Film?

Answer 14

25% in 8 hours