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PHYSICS CHAPTER 2

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Across
1
The length of a pulse from front to back.
3
The time it takes for one cycle to occur
8
Maximun variation that occurs in an acoustic variable.
12
The time from the beginning of one pulse to the beginning of the next
15
How PRF is expressed
16
The time it takes for one pulse to occur
18
The measurement of how often something happens.
19
Impedance units
20
The range of frequencies contained in a pulse
21
The rate at which energy passes through a unit area.
22
Ultrasound in which cycles repeat indefinitely.
Down
2
The attenuation that occurs with each centimeter the sound wave travels.
4
The speed with which a wave moves through a medium.
5
Sound scattered back in the direction from which it originally came.
6
Liquid suspensions that are injected into the circulation intravenously that are used to increase echogenicity.
7
A form of acoustic noise in sonographic imaging.
9
The weakening of sound while it propagates.
10
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PRPs unit
13
The fraction of time that pulsed ultrasound is on.
14
The redirection of sound in many directions by rough surfaces.
17
Determines how much of an incident sound wave is reflected back into the first medium and how much is transmitted into the second medium.