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12 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Intensity |
The concentration of the power in a beam. |
Key parameter for bioeffects |
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Intensity equation |
W/cm2 = power/ beam area |
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Key words of intensity |
Peak, the maximum value Average, the mean value Spatial, distance or space Temporal, referring to all time (Transmit and receive) Pulse, referring only to the time the pulse exists. (Transmit only) |
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Intensity |
The concentration of the power in a beam. Watts/square cm, w/cm2❤️ |
Key parameter for bioeffects |
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Resulting intensity |
SPTP SATA SPTA❤️ thermal bioeffects SATA APPA SAPA |
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Spatial |
An ultrasound beam does not have the same intensity at different locations within the beam. space |
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Temporal |
A pulse ultrasound beam does not have the same intensity at different times. Time |
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Important facts of INTENSITY ❤️ |
♥️may be reported in various ways with respect to time and space ♥️key parameter with regards to bioeffects ♥️important in the study of bioeffects. SPTA most relevant with respect to tissue heating ♥️peak is greater than average |
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Logarithms |
A novel way of rating numbers Represents the number "10's" that are multiplied together to create the original number |
10 x 10 = 100, the log of 100 is 2
10 x 10 x 10 = the log of 1,000 is 3
Count the zeros. |
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Decibels |
A logarithmic scale A relative scale - ratio♥️of the final to the initial strengths A comparison |
What are the units of relative amplitude? mm Pa Degrees dB♥️ Hz |
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Positive Decibels |
Getting bigger. The intensity is increasing ♥️ 3dB two times bigger 10dB ten times bigger |
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Negative Decibels |
Getting smaller. Intensity is decreasing ♥️ -3dB one half -10dB one tenth |
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