Ultrasound Physics Chapter 5: Intensities

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Last updated 12:52 AM on 9/3/26
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27 Terms

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Intensity

The concentration of energy in a sound beam

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Formula for Intensity

Intensity= power/area

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If the area changes depending on where you are in the sound beam what else will change?

the intensity will change depending on where you are in the sound beam

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Sound beam intensity

Intensity of sound is going to varying at different depths and different side-to-side locations within the sound beam.

<p>Intensity of sound is going to varying at different depths and different side-to-side locations within the sound beam.</p>
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Where is the strength (intensity) of the sound beam located?

The strength(intensity) of a sound beam varies depending on where we are taking the measurement within the sound beam.

Also, intensity varies over time with pulsed ultrasound.

<p>The strength(intensity) of a sound beam varies depending on where we are taking the measurement within the sound beam.</p><p>Also, intensity varies over time with pulsed ultrasound.</p>
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Peak measurements are ___ than average measurements.

Larger

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The higher the intensity the higher the likely hood of what?

Bioeffects

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Mechanical Bioeffects

A high intensity in a short time

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Thermal Bioeffects

A low intensity for a long time

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Spatial

refers to location or space

<p>refers to location or space</p>
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What are the 2 possible ways to report an intensity measurement?

Spatial Peak Intensity and Spatial Average Intensity

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Spatial Peak Intensity

the beam's intensity at the location where the intensity is at it's maximum

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Spatial Average Intensity

the average intensity across the beam's entire cross-sectional area

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Which intensity measurement will always be higher?

Spatial Peak Intensity

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Temporal

refers to time

<p>refers to time</p>
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What are the 4 different methods for how we can report measurements of intensity for pulsed sound waves?

Temporal Peak Intensity, Pulse Average Intensity, Temporal Average Intensity, and Imax

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Temporal Peak Intensity

measuring the intensity of a beam at the instant in time that it's at its maximum value

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Pulse Average Intensity

measuring the average intensity during the pulse duration(transmit time)

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Temporal Average Intensity

measuring the average intensity during the entire pulse repetition period (BOTH transmit and receive time)

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Imax

the average intensity during the most intense half-cycle in time

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What are the rank of intensities in order from largest to smallest?

SPTP, Imax, SPPA, SPTA, and SATA

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SPTP

spatial peak, temporal peak

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SATP

spatial average, temporal peak

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SPTA

spatial peak, temporal average

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SATA

spatial average, temporal average

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SPPA

spatial peak, pulse average

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SAPA

spatial average, pulse average