Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Dose Limits for Ionizing Radiation > Fluoroscopy week 3 cont. > Flashcards

Fluoroscopy week 3 cont. Flashcards

1
Q

what is a blotchy or grainy appearance caused by insufficient radiation to create a uniform image

A

quantum mottle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

quantity of photons is controlled by the

A

mA and time settings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

the most commonly used fluoroscopic viewing system is

A

video

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

video uses

A

closed circuit video

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

fluoro video cameral use a

A

vidicon or plumbicon tube or a charge-coupled device (CCD)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

both tubes are _ in operation

A

similar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Plubicon tube has a _ time than a Vidicon tube

A

faster response

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

consists of a

A

control grid w/a cathod

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

cathode consists of pairs of _ serve to cause the election beam to scan the target in a path known as a

A

deflecting coils

Raster pattern

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

commercial TV uses

A

525 horizontal line pattern

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

High-resolution video systems now offer

A

1050 Line systems

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

for cathode the electron beam scans across the screen nearly _

A

1,000,000 times per min.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

to avoid flicker each scan is divided into two halves 1st half is _ and 2nd half is

A

even # lines

odd # lines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what reduces the resolution and is the primary disadvantage of a video viewing system

A

Raster Pattern

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The output phosphor of the image intensification tube is coupled with the face plate of the vidicon tube by fiber optics or optical lenses

A

Anode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

for anode, the signal plate is thin enough to _ yet thick enough to _ out of the tube

A

transmit light

conduct the electronic signal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Vidicon tubes use _
Plumbicon tubes use _transmit light
conduct the electronic signal

A

Trisulfide

Lead oxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

what tube is connected to the output screen of the image intensification tube by either fiber optics or an optical lens system

A

vidicon tube

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

vidicon tube is unable to allow for

A

spot filming

20
Q

light photons are transmitted to the

A

signal plate and target

21
Q

spot filming requires an

A

optical lens system

22
Q

CCD means

A

charge-coupled devise

23
Q

what is a semiconducting device capable of storing a charge from light photons striking a photosensitive surface

A

ccd

24
Q

when light strikes the photoelectric cathode of the CCD, electrons are released based on the

A

intensity of incident light

25
Q

CCD’s have extremely fast _ which eliminates what

A

discharge time

image lag

26
Q

CCD’s are useful in

A

cardiac catheterization

27
Q

CCD’s are more sensitive than

A

video tubes

28
Q

CCD’s work at

A

lower voltage (longer life)

29
Q

CCD’s have what type of resolution

A

acceptable

30
Q

True/False CCD’s don’t damage easily

A

true

31
Q

video monitors are a

A

tv tube

32
Q

what consists of a vacuum tube with a fluorescent phosphor coated on the inside of the front screen and a election gun with deflecting and focusing electromagnets

A

cathode ray tube

33
Q

for the video monitor the electron gun is the

while the Anode is plated onto the

A

cathode

front screen

34
Q

what follows the same raster pattern used by the camera

A

gun

35
Q

phospher crystals emit

A

light when struck by e and transmit it as a visual image

36
Q

what is the most restrictive element in the fluoro imaging chain resolution

A

video monitor

37
Q

magnification of this image by the video camera or an optical system can increase

A

resolution significantly

38
Q

video monitors operate in the _ and can emit

A

low kV

low energy x-rays

39
Q

for video monitor, what can be adjusted with controls on the monitor itself

A

contrast and brightness

40
Q

digital fluoroscopy is achieved through the use of a

A

thin film transistor

41
Q

Thin film transistor replaces what

A

the image intensifier in nondigital fluoro systems

42
Q

TFT is a _ unit with a _ connected to each pixel element

A

pixelated

photodiode

43
Q

A unique feature of TFT’s is that they are relatively

A

insensitive to x-ray photons

44
Q

what is added to the image receptor to increase sensitivity

A

Csl Scintillator element

45
Q

what resolution isn’t as high as radiography

Why?

A

Digital Fluoro

the clinical value is outweighed by pt. exposure concerns

46
Q

Dynamic systems are

A

recordings of fluoro images has been limited to cine film and videotape

Dose Limits for Ionizing Radiation (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions