Ultrasound

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Ultrasound

Intensity of sound equals

2 points

Power X Area

Power / Area

Density X Speed

Density / Speed

Clear selection

Impedance equals

2 points

Power X Area

Power / Area

Density X Speed

Density / Speed

Clear selection

The lower wavelength of a sound wave

2 points

Decreased resolution

Surface roughness masked

Decrease scatter

Increase scatter

Clear selection

Shadowing is from

2 points

Scatter

Attenuation

Absorption

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Attenuation equals

2 points

Absorption

Scatter

Absorption X Scatter

Absorption + Scatter

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The unit of impedance is

2 points

Rayl

Joule per cubic centimeter

dB per KHz

Unitless

Clear selection

Crystal thickness equals ______ wavelength, and optimal matching layer equals ______ wavelength

2 points

0.25, 0.25

0.5, 0.75

0.2, 0.5

0.5, 0.25

Clear selection

Matching layer impedance is

2 points

Low

Intermediate

High

Varies with scan type

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Phased array transducer is ideal in all EXCEPT

2 points

Between ribs

Transcranial

Transvaginal

Thyroid

Clear selection

Higher soundwave frequency leads to _______ divergence and ______ scatter

2 points

Less, more

More, more

More, less

Less, less

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The main use of stand off pads is to

2 points

Stabilize the scanner probe in areas affected by patient motion

Focus the beam to area of interest

Reduce focal spot blur improve axial resolution

Shift superficial objects closer to focal spot

Shift deep objects closer to focal spot

Clear selection

The main source of volume averaging in the near and far fields is the

2 points

Axial resolution

Lateral resolution

Elevational resolution

Azimuthal resolution

A & B

All of the above

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All of the following artifacts are associated with multiple echo reflections, EXCEPT

2 points

Reverberation

Comet tail

Ring down

Mirror image

Refraction artifact

D & E

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Mirror image doppler artifact usually happens when the angle between the probe and the vessel is

2 points

30-60

180

Clear selection

Color doppler displays the _______ frequency shifts, while power doppler displays the ______

2 points

Average, total

Median, total

Minimum, Maximum

Median, Mean

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Increasing the transmit gain will decrease lateral resolution because of

2 points

Decreased depth of penetration

Beam spreading

Increasing tissue vibration

Increased wavelength

Clear selection

Harmonics are not produced in the

2 points

Focal zone

Far field

Near field

Clear selection

Compound imaging uses ______ steering and peaks around ______

2 points

Mechanical, object edges

Mechanical, FOV margins

Electronic, object corners

Electronic, FOV edges

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Soundwave intensity is proportional to

2 points

Amplitude squared

Acoustic pressure squared

A & B

Clear selection

Spatial average intensity relates to

2 points

Spatial resolution

Spatial frequency

Beam intensity

Beam width

Clear selection

Temporal average intensity relates to

2 points

Scan time

Motion

Temporal resolution

Dead time

Clear selection

Cavitation is most likely to occur with

2 points

Low frequency and low pressure

High frequency and high pressure

High frequency and low pressure

Low frequency and high pressure

Clear selection

Thermal index is the ________ temperature rise in tissue secondary to US energy absorption

2 points

Average

Total overtime

Minimum

Maximum

Clear selection

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