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Physics Boards Exam > Axial And Lateral Rez > Flashcards

Axial And Lateral Rez Flashcards

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1
Q

Spatial resolutionu

A

Dependent on pixels of a monitor and scan lines in an image

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2
Q

Contrast resolution

A

Ability to differentiate between shades of gray

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3
Q

Temporal resolution

A

Determines accuracy of moving objects

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4
Q

Elevational resolution

A

Determines if we’re seeing accurately a thin slice of anatomy with the US beam

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5
Q

Lateral resolution

A

Determines accuracy of side by side structures being displayed

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6
Q

Axial resolution

A

Determines how accurately a system can display two reflectors that are parallel to sound beam

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7
Q

Axial =

A

SPL

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8
Q

Lateral =

A

Beam width

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9
Q

WHAT REZ? PARALLEL TO SOUND BEAM

A

AXIAL RES

Machine’s capability to accurately image reflectors that are parallel to sound beam

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10
Q

What is SPL?

A

Spatial pulse length… its the distance a pulse takes up in space

SPL (mm) = # of cycles x wavelength (mm)

Axial resolution (mm) = SPL (mm) divided by 2

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11
Q

The smaller the axial rez…

A

The more definition you have between reflectors.. the shorter the better

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12
Q

Axial rez is adjustable true or false

A

False, it is not adjustable by the sonographer

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13
Q

Axial rez and ______ are INVERSELY related

A

Frequency (# of cycles)

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14
Q

Higher the frequency the better the _______ rez

A

Axial

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15
Q

Longer pulses degrades the _______ resolution

A

Axial

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16
Q

The best axial rez has the ________ frequency and the lowest ________

A

Highest, cycles

17
Q

Axial resolution synonyms

A

Longitudinal resolution, range resolution, radial resolution, depth resolution

18
Q

Lateral rez is the machine’s capability to accurately image reflectors that are _________ to the sound beam

A

PERPENDICULAR

19
Q

Formula for lateral rez

A

Lateral rez (mm) = beam width (mm)

20
Q

The smaller the lateral rez the better? True or false

A

TRUE

21
Q

The BEST location for lateral rez is where

A

At the focus

22
Q

Which rez is ‘BETTER’ than the other (axial or lateral)

A

Axial because the SPL is typically smaller than the beam width

23
Q

Lateral rez synonyms

A

Lateral
Angular
Transverse
Azimuthal

24
Q

Which scenario has better lateral rez in the far field? A large diameter transducer or a narrow diameter transducer?

A

A large diameter transducer (think about divergence)

25
Q

Focusing - lens

A

External, fixed focus, cannot be changed

26
Q

Focusing - curved elements

A

Internal, fixed focus, cannot be changed

27
Q

Most transducers are going to have _______ focusing. These transducers are known as ______.

A

Electronic… IT IS ADJUSTABLE BY THE SONOGRAPHER; arrays

28
Q

Unfocused beams in comparison to focused beams actually have better

A

Far field lateral rez

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