Brainscape's Knowledge GenomeTM

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


See full index

PHY > display/ QA > Flashcards

display/ QA Flashcards

1
Q

what does cathode ray tube (CRT) contain?

A
  • a phosphor-coated florescent screen

- electron beam generator

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

how does a Cathode ray tube work?

A
  • electorns which strike the inside of the screen will cause the pixels at that spot to temporarily light up
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

CRT- the brighness of the dot on the screen = ?

A

strength of the electron beam

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

The CRT will generate electron beams that will ‘sweep’ the inner surface of the screen and cause lines to appear on the screen. This is called?

A

raster scanning

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

raster scanning involves how many horizontal lines?

A

525 horizontal lines

  • grouped into odd and even fields (262.5 line/field)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is twin interlacing?

A

In a given moment, one field is constructed; in the next moment, the other is constructed

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

in raster scanning how many images/second?

A

30 images/second

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

what is refresh rate?

A

how many images are shown on the screen per second

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

what is frame rate?

A

how quickly frames are built

  • number of images entered into the image memory per second
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

refresh rate limits?

A

frame rate

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

instruments- display?

A

Frame rate  Image Memory  Refresh rate

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

colour display involves?

A
  • 3 cathode ray tubes

- 1 per colour

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

flat panel display (LCD)?

A
  • Liquid panel display

- matrix of photo-electric elements

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

Amplitude of voltage will decide?

A

luminance (brightness of element)

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

refresh rate on a typical LCD?

A

60 Hz

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

LCD advantages over CRT?

A
  • display is much lighter and thinner
  • good image quality, brighter image
  • reduced eyestrain
  • perform well in range of ambient light environments
  • lower power consumptions and energy emissions
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

flat panel display (plasma)?

A
  • electrical charge ionizes gas producing UV light
  • UV light hits a phosphor coated screen which will glow
  • 85Hz
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

flat panel display (organic LED)?

A
  • latest and greatest, even thinner

- involves light emitting diode

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

Information received at the display can be shown in many different ways (3)?

A
  • B-mode
  • M-mode
  • A-mode
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

brightness mode AKA?

A
  • greyscale
  • 2D
  • suggests the brightness of each reflector at each anatomical position
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

M-mode?

A
  • motion mode
  • cardiac structures
  • displays info from a single scan line- beam is stationary
  • amplitude at each depth represents brightness of reflector
22
Q

M-mode Y and X axis?

A

y-axis: depth

x-axis: time

23
Q

in M-mode stationary areas show as?

A

straight lines

  • moving areas show as wiggly lines
24
Q

what is A-mode?

A
  • amplitude mode

- displays info from a single scan line- beam is stationary

25
Q

A-mode y and x axis?

A

y-axis: amplitude (brightness)

x-axis: depth

26
Q

A-mode is mainly used in what kind of imaging?

A

opthalmic imaging

27
Q

what is RAM?

A
  • random access memory
  • information storage
  • temporary, very quick to access
  • info lost when machine is turned off
28
Q

‘image memory’ within the image processor uses?

A

RAM

29
Q

ROM?

A
  • rean only memory
  • permanent info in storage
  • will remain even if machine is turned off
30
Q

Programmable ROM- PROM?

A
  • permanent information in storage
  • can still be accessed, adjusted, erased
  • will remain even is machine is turned off
31
Q

Where might the images we take and store fall under?

A

PROM

32
Q

HIS – Hospital Information System?

A

An integrated information system designed to manage the administrative, financial and clinical aspects of a hospital

Everything involved in running a hospital (including paper and digital systems)

33
Q

RIS – Radiology Information System?

A
  • built to manage workflow in radiology
  • Patient scheduling, intake, worklist generation, medical reporting, transcription, and report management
  • a part of the HIS
34
Q

PACS – Picture Archiving and Communication System

A

Storage, retrieval and distribution of images

35
Q

2 main types of testing- quality assurance?

A

1- operational QA

  1. acoustic output
36
Q

what is operational quality assurance?

A
  • anatomical imaging/measurements

- doppler evaluation

37
Q

what is acoustic output?

A
  • beam former/transducer

- related to bioeffects

38
Q

operational QA examples?

A
  • tissue equivalent phantom

- test object

39
Q

acoustic output?

A

hydrophone

40
Q

what is TEP – tissue equivalent phantoms?

A
  • AKA tissue mimicking phantom (TM)
  • mimics soft tissue characteristics
  • we scan along the top
41
Q

TEP- tissue equivalent phantoms?

A
  • graphite- filled aqueous gels
  • urethane rubber
  • nylon strings used to demarcate echogenic points
42
Q

Graphite-filled aqueous gels?

A

1.54 mm/μs

43
Q

urethane rubber?

A

1.45 mm/μs

44
Q

TEP function?

A
  • come with blue prints
  • compare measurements on screen to blueprints
  • check accuracy of axial and lateral resolution
45
Q

TEP mimics?

A
  • cysts

- solids

46
Q

Hydrophone?

A
  • aka microprobe
  • Small transducer element on a long hollow needle (<1mm diameter)
  • Point transducer at hydrophone, hydrophone picks up pressure wave, converts to a voltage
47
Q

Polyvinylidene Fluoride Membrane (PVDF)

A

Point transducer at PVDF membrane, picks up pressure wave, converts to a voltage

48
Q

Oscilloscope readings can be used to calculate?

A

T, PD, PRP, DF

f, λ, SPL

49
Q

Spectrum analyzer?

A

connected to oscilloscope: able to break down incoming bandwidth to individual frequencies

50
Q

oscilloscape readings can calculate?

A

amplitude based on peasks of the signal

51
Q

Calorimeter

A

Measures tiny, tiny changes in temperature
Involves a sensitive thermometer

Relates the change in temperature to the output power/intensity

PHY (5 decks)

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