Term
| Time-of-Flight aka Go-Return Time |
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Definition
The time that passes between the pulse creation and the pulse reception
Time (μs) = imaging depth (cm) * 13 μs
Directly related to the depth a sound pulse travels
Same thing as PRP |
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Term
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Definition
| The object a sound wave encounters and is reflected off of |
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Term
| Calculating Reflector Depth |
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Definition
Depth (mm) = [propagation speed (mm/μs) * go-return time (μs)] ÷ 2
Depth in soft tissue (mm) = [1.54 mm/μs * go-return time (μs)] ÷ 2 |
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Term
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Definition
For every 13μs of go-return time, the object creating the reflection Is 1 cm deeper in the body
Soft tissue only! |
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Term
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Definition
PRF inversely related to depth of view
In one second, sound can travel into soft tissue and return from a depth of 77000 cm; based on propagation speed of 1,540 m/s in soft tissue
PRF in soft tissue (Hz) = 77000 cm/sec ÷ imaging depth (cm) |
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Term
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Definition
Time of flight (μs) = depth (cm) * 13 (μs/cm)
Total distance traveled (cm) = depth to the reflector (cm) * 2
PRP (μs) = imaging depth (cm) * 13 (μs/cm)
PRF (Hz) = 77,000 (cm/s) ÷ imaging depth (cm) |
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