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Ultrasonography > RESOLUTION > Flashcards

RESOLUTION Flashcards

1
Q

THREE ASPECTS OF RESOLUTION

A
  1. Spatial Resolution
  2. Temporal Resolution
  3. Contrast Resolution
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2
Q

The ability of an imaging system to differentiate between structures, images, or events and display them as a separate entity.

A

resolution

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3
Q

The ability to display two structures situated close together as separate image.

A

spatial resolution

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4
Q

components of spatial resolution

A

axial and lateral

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5
Q

Ability to display small targets along the path of the beam as separate entities.

A

axial resolution

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6
Q

 Resolution along the axis of the beam

A

axial resolution

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7
Q

axial resolution aka

A

longitudinal resolution

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8
Q

latera resloution aka

A

azimuthal resolution

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9
Q

 Depends upon the width of the ultrasound beam (best where the beam is narrowest)

A

lateral resolution

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10
Q

formula for axial resolution

A

Spatial pulse length / 2

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11
Q

unit of axial resolution

A

mm

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12
Q

 Ability of the imaging system to differentiate between tissues and display them as different shades of gray.

A

contrast resolution

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13
Q

 Ability of the imaging system to display events which occur at different times as separate images.

A

temporal reso

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14
Q

important to echocardiography

A

temporal reso

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15
Q

temoral reso is determined by

A

frame rate

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16
Q

no. of images per second

A

frame rate

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17
Q

two types of planes for hadling the tranducer

A

longitudinal and transverse

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18
Q

longitudinal on the left and right sides are the patients

A

superior and inferior

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19
Q

transverse on the left and right sides are the patients

A

right and left

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20
Q

 Displays images in black and white combinations only.

A

bistable scanninga

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21
Q

a mode stands for

A

amplitude mode

22
Q

 A single dimension display consisting of a horizontal baseline. This baseline represents time and or distance with upward (vertical) deflections (spikes depicting the acoustic interface)

A

a- mode

23
Q

used in opthalmology

A

a - mode

24
Q

b mode stands for

A

brightness mode

25
Q

 A two-dimensional display of the ultrasound.

A

b-mode

26
Q

 The A-mode spikes are electronically converted into dots and displayed at the correct depth from the transducer.

A

b-mode

27
Q

b-mode is aka

A

b-scan or gray scale sonography

28
Q

m - mode aka

A

motion mode

29
Q

 Used to visualize things that are physically moving. The motion occurring in a one dimensional scan line is displayed on the vertical axis over time on the horizontal axis

A

m-mode

30
Q

 This mode is most commonly used in the evaluation of cardiac valves and fetal heart activity

A

m - mode

31
Q

 uses the frequency shift of sound waves to measure velocity, typically blood

A

Doppler

32
Q

most common uses of doppler

A

o Color flow doppler CFD
o Power or Angiodoppler
o Spectral doppler (pulsed and continuous wave)

33
Q

how much distance into the body the image displays in the far field.

A

depth

34
Q

 Used to adjust the size of the image so that organs and adjacent structures or regions of interest are equally well visualized.

A

depth

35
Q

hihger depth = – magnification

A

higher

36
Q

 Is a knob that adjust the overall UTZ echo signalgain

A

gain

37
Q

gain ↑ = ___ reflection =__ brightness

A

high and high

38
Q

set up as a column of sliding knobs or may be adjusted for near and far gain.

A

time gain compensation

39
Q

 Allows selective control of gain at different depths

A

TGC

40
Q

allows for the magnification of one area on the screen

A

ZOOM

41
Q

 This control is used to magnify structures of interest. Various capabilities as provided by the manufacturer.

A

KEYBOARD

42
Q

 concentrates the sound beam into a smaller beam area than would exist otherwise. This area of focus is where you will obtain your best images.

A

FOCUS

43
Q

 It can be found on the monitor (arrow), on the vertical millimeter scale

A

FOCUS

44
Q

 Determines how many shades of gray are demonstrated on an image.

A

DYNAMIC RANGE

45
Q

gives fewer grays and increases contrast

A

DYNAMIC RANGE

46
Q

Increasing dynamic range gives a wider range of ___ and decreases ____

A

GRAYS AND CONTRAST

47
Q

This control captures a single frame from a dynamic image

A

FREEZE

48
Q

allow the operator to review a sequence of acquired images

A

CINE LOOP

49
Q

 Available to measure distances

A

caliper

50
Q

 Images may be captured for archival or export

A

acquiring images

Ultrasonography (5 decks)

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