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SPI Review 6

Intensity Logarithms/Decibels

The concentration of the power in a beam Intensity
Intensity is the key parameter for ___________ Bio effects
With pulsed ultrasound, intensity is not uniform throughout __________ Time
An ultrasound beam does not have the same intensity at different locations within the beam. Spatial Intensity
Pulsed ultrasound does not have the same intensity at different times. Temporal Intensity
The maximum value of intensity Peak
The mean value or mathematical middle Average
Referring to distance or space Spatial
Referring to all time (transmit and receive) Temporal
Referring only to the time the pulse exists (transmit only) Pulsed
What are the 6 descriptions of intensity? SPTP, SATP, SPTA, SATA, SPPA, SAPA
What is the highest value of intensity? Spatial peak, temporal peak (SPTP)
What intensity description is the most relevant for thermal bioeffects? SPTA
Intensity description that has the lowest value. SATA
What unit goes with all of the intensity descriptions? w/cm2
A novel way of rating numbers, a peculiar combination of addition and multiplication Logarithms
The logarithm of any number represents the number of _______ that are multiplied together to create the original number 10s
A relative comparison or ratio between the final to the initial strengths Decibels
Two _________ are needed to calculate decibels Intensities
What units reports the relative intensity (bigness) of a sound beam? decibels
Positive decibels means the intensity is getting _________ bigger
_________ means the final intensity is 2 x bigger than the original intensity 3dB
__________means the final intensity is 10 times bigger than the original intensity 10dB
___________decibels means the intensity is getting smaller negative
_________means the final intensity is ½ the original. -3dB
-10 dB means the final intensity is ______ the original 1/10
Created by: dawncoffield
 

 



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