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Techniques Of Ultrasound > Knobology and Physics > Flashcards

Knobology and Physics Flashcards

1
Q

Fresnel

A

Near field

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2
Q

Fraunhofer

A

Far field

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3
Q

The region around the focus where the beam is relatively narrow

A

Focal zone

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4
Q

Create images that are more accurate than from other depths.

A

Reflections from the focal zone

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5
Q

Describes the maximum distance into the body than an ultrasound system is imaging.

A

Depth of view

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6
Q

The markers along the edge of an image…

A

indicate depth

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7
Q

Increases the amplitude of the returning signals

A

Receiver gain

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8
Q

This creates a brighter image

A

Increasing the amplitude of the returning signals

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9
Q

adjusts gain according to depth

A

TGC

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10
Q

TGC stands for…

A

Time Gain Compensation

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11
Q
A

main sound beam lobe

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12
Q
A

central beam axis

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13
Q
A

focal region, area

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14
Q

the 3 spatial resolution dimensions

A

axial resolution, lateral resolution, slice thickness

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15
Q

the sound beam profile characteristics

A

main sound beam lobe, central beam axis, focal region

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16
Q

creates the appearance of smaller dot sizes on the screen.

A

Increased axial resolution

17
Q

Determined by the beam width
•A narrow beam width gives a good lateral resolution
•The lateral resolution is best at the focus (transition zone)
•Higher frequency results in better lateral resolution due to beam being less divergent

A

lateral resolution

18
Q
A

slice thickness

19
Q
A

Apodization

20
Q

•The ability to depict the movement of structures accurately
•Temporal resolution is very important in the depiction of moving objects, such as the heart
•Temporal resolution is determined by the frame rate

A

temporal resolution

21
Q

refers to how closely positioned two reflectors can be to one another and still be resolved as two different objects on the display

A

Spatial resolution

22
Q

When structures are displayed as separate images we say that they are…

A

resolved

23
Q

Names for axial resolution:

A

L-A-R-R-D
•Longitudinal
•Axial
•Range
•Radial
•Depth

24
Q

• decrease temporal resolution
• improve lateral resolution
• increase sensitivity of the sound beam

A

Multiple focal zones

Techniques Of Ultrasound (3 decks)

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