Key Terms 5/6/7 Flashcards

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1
Q

Intensity

A

a beams power divided by its area

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2
Q

5 key words related to intensity

A

spatial peak average temporal pulsed

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3
Q

Intensity measurement methods

A

SPTP SATP SPTA SPPA SAPA SATA

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4
Q

Commandments of intensity

A

10 of the most important ways that intensity is difened and measured

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5
Q

Decibel notation

A

relative measurement comparision ratio logarithmic

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6
Q

Logarithms

A

a novel method of rating numbers as the logarithm increases by 1 the actual number increases by 10

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7
Q

Positive & negative decibels

A

rep[ort decebels that are increasing or decreasing

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8
Q

Decibels & intensities

A

decibels require 2 intensities, the start level and the actual level at time of measurement, the measured is divided by the start and you get your ratio

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9
Q

Attenuation

A

is the weakening of sound waves as the travel

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10
Q

Distance and attenuation

A

they are directly related, as you travel farther the amount attenuation is greater

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11
Q

Frequency and attenuation

A

directly related, the higher the prequency the higher the attenuation

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12
Q

Reflection

A

a sound waves energy as it strikes a boundry and is redirected back to the source

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13
Q

Scattering

A

random redirection of ultrasound in many directions

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14
Q

Absorption

A

occurs when ultrasonic energy is converted into another form such as heat

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15
Q

Specular reflection

A

the striking of a smooth boundry and the reflection of the beam

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16
Q

Diffuse reflection

A

the striking of a rough boundry and the diffuse reflection of the beam

17
Q

Rayleigh scattering

A

omni directional scattering of sound waves interaction of ultrasound and RBC’s results in Rayleigh scattering when freq doubles scattering is 16 times greater

18
Q

Attenuation coefficient

A

number of decibels of attenuation that occurs when sound travels one centimeter units dB/cm

19
Q

Attenuation coefficient in soft tissue

A

one half the freq

20
Q

Attenuation in media

A

varies based on density of the media water low air extremely high

21
Q

Half value layer

A

distance aound travels in a tissue that reduces the intensity to one half its original value

22
Q

Impedance

A

acoustic resistance to sound traveling in a medium

23
Q

Range equation

A

the distance calculated by the time the sound takes to travel to the reflector in the body and return to the transducer

24
Q

Time of flight

A

elapsed time from pulse creatoin to pulse reception also called go return time

25
Q

PRP imaging depth

A

shallow imaging equals short PRP deeper equals longer PRP

26
Q

PRF imaging depth

A

shallow imaging equals higher PRF deeper imaging equals lower PRF

27
Q

Reflection and transmission

A

reflection is the redirection of sound when it strikes a boundry transmission is the sound energy that passes through the boundry and continues on