chapter 13- digital radiography

studied byStudied by 0 people
0.0(0)
learn
LearnA personalized and smart learning plan
exam
Practice TestTake a test on your terms and definitions
spaced repetition
Spaced RepetitionScientifically backed study method
heart puzzle
Matching GameHow quick can you match all your cards?
flashcards
FlashcardsStudy terms and definitions

1 / 44

encourage image

There's no tags or description

Looks like no one added any tags here yet for you.

45 Terms

1

3 elements of digital radiography

capture

coupling

collection

New cards
2

that in which the x-ray is captured

capture element

New cards
3

that which transfers the x-ray generated signal to the collection element

coupling element

New cards
4

examples of a collection element

photodiode

charge-coupled device (CCD)
a thin-film transistor (TFT)p

New cards
5

photodiode and CCD collect

light

New cards
6

TFT collects

electrons

New cards
7

capture element of CR

BaF PSP

New cards
8

coupling element of CR

lens/fiber optics

New cards
9

collection element of CR

photodetector

New cards
10

capture element of SPR

Nal/Csl

New cards
11

coupling element of SPR

none

New cards
12

collection element of SPR

photodetector

New cards
13

capture element of indirect DR

Csl, GdOS

New cards
14

coupling element of indirect DR

fiber optics

contact layer

New cards
15

collection element of indirect DR

CCD/CMOS

TFT

New cards
16

capture element of direct DR

a-Se

New cards
17

coupling element of direct DR

none

New cards
18

collection element of direct DR

TFT

New cards
19

Used in CT to help with patient positioning image volume

scanned projection radiography

New cards
20

how is scanned projection radiography obtained in CT?

maintaining the energized x-ray tube

New cards
21

early versions of scanned projection radiography had

patient motion blur

scatter

New cards
22

new versions of scanned projection radiography are used with

digital radiographic tomosynthesis

New cards
23

The light-sensing element for most digital cameras, silicon based

charge coupled device (CCD)

New cards
24

3 principal advantageous imaging characteristics of CCD

sensitivity

dynamic range

size

New cards
25

ability to detect and respond to low levels of light

sensitivity

New cards
26

ability of the CCD to respond to a wide range of light intensity, from very dim to very bright

dynamic range

New cards
27

size of CCD is (large/small)

very small

New cards
28

when CCD responds to low level of exposure this means

lower patient dose

New cards
29

CCD contrast (related/unrelated) to IR exposure

unrelated

New cards
30

indirect DR process by which x-rays are
converted first to light and then to an electronic signal.

Csl/CCD

New cards
31

CCD are tiled, so exposure time is

short

New cards
32

because Light from a CsI phosphor is transmitted through fiber-optic bundles to the CCD array

high x-ray capture efficiency
good spatial resolution

New cards
33

Because of the edges of each CCD, pixel values must be

interpolated at interfaces

New cards
34

an indirect DR process by which x-rays are converted first to light and then to an electronic signal.

Csl/a-Si

New cards
35

collection element of Csl/a-Si

silicon and sandwiched as TFT

New cards
36

Amorphous silicon is __ that can be

fluid painted

New cards
37

spatial resolution in DR is

pixel limited

New cards
38

Large portion of the face of the pixel is covered by

electronic components and wires that are not sensitive to the light emitted by the CsI

New cards
39

percentage of pixel face sensitive to x-rays

fill factor (80%)

New cards
40

how much of beam in (CsI/a-Se) beam does not contribute to image

20%

New cards
41

what happens to spatial resolution when pixel size decreases?

increases

New cards
42

why when pixel size decreases, patient dose increases?

fill factor is reduced, but x-ray intensity must be increased to maintain signal strength

New cards
43

a direct DR process by which x-rays are converted directly into an electronic signal

amorphous selenium (a-Se)

New cards
44

incoming x-ray beam interacts with a-Se. producing a

charged pair

New cards
45

charged pair from a-Se is stored by capacitor until signal is read by

TFT

(making a-Se capture and coupling element)

New cards

Explore top notes

note Note
studied byStudied by 18 people
1003 days ago
5.0(1)
note Note
studied byStudied by 13 people
971 days ago
5.0(1)
note Note
studied byStudied by 26 people
410 days ago
5.0(1)
note Note
studied byStudied by 87 people
15 hours ago
5.0(1)
note Note
studied byStudied by 2 people
7 days ago
5.0(1)
note Note
studied byStudied by 1679 people
284 days ago
5.0(3)
note Note
studied byStudied by 92 people
903 days ago
5.0(3)

Explore top flashcards

flashcards Flashcard (54)
studied byStudied by 12 people
349 days ago
5.0(1)
flashcards Flashcard (34)
studied byStudied by 13 people
555 days ago
5.0(1)
flashcards Flashcard (37)
studied byStudied by 18 people
834 days ago
5.0(1)
flashcards Flashcard (60)
studied byStudied by 11 people
823 days ago
5.0(1)
flashcards Flashcard (31)
studied byStudied by 11 people
833 days ago
5.0(1)
flashcards Flashcard (72)
studied byStudied by 13 people
704 days ago
5.0(1)
flashcards Flashcard (64)
studied byStudied by 97 people
836 days ago
5.0(6)
flashcards Flashcard (75)
studied byStudied by 41 people
8 days ago
5.0(1)
robot