# Shared Flashcard Set

## Details

Chapter 07
Range Equation
6
Physics
08/31/2018

Term
 Time-of-Flight aka Go-Return Time
Definition
 The time that passes between the pulse creation and the pulse receptionTime (μs) = imaging depth (cm) * 13 μsDirectly related to the depth a sound pulse travelsSame thing as PRP
Term
 Reflector
Definition
 The object a sound wave encounters and is reflected off of
Term
 Calculating Reflector Depth
Definition
 Depth (mm) = [propagation speed (mm/μs) * go-return time (μs)] ÷ 2Depth in soft tissue (mm) = [1.54 mm/μs * go-return time (μs)] ÷ 2
Term
 The 13 Microsecond Rule
Definition
 For every 13μs of go-return time, the object creating the reflection Is 1 cm deeper in the bodySoft tissue only!
Term
 PRF and Imaging Depth
Definition
 PRF inversely related to depth of viewIn 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 tissuePRF in soft tissue (Hz) = 77000 cm/sec ÷ imaging depth (cm)
Term
 Equations to Know
Definition
 Time of flight (μs) = depth (cm) * 13 (μs/cm)Total distance traveled (cm) = depth to the reflector (cm) * 2PRP (μs) = imaging depth (cm) * 13 (μs/cm)PRF (Hz) = 77,000 (cm/s) ÷ imaging depth (cm)
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