Range Equation Flashcards

Vocabulary and quantitative relationships focused on the Range Equation and 13-microsecond rule in ultrasound imaging.

Time of Flight (Go Return Time)

The elapsed time from when a pulse is emitted until the reflection returns, used to gauge the distance of a reflector.

Relationship: Time of Flight and Depth

Time of flight is directly related to depth.

13-Microsecond Rule

A rule stating that for every $13\,\mu s$ of go-return time, the reflector depth is $1\,cm$ and the total distance traveled is $2\,cm$.

Reflector depth for $26\,\mu s$

$$2\,cm$$

Total distance traveled for $26\,\mu s$

$$4\,cm$$

Reflector depth for $39\,\mu s$

$$3\,cm$$

Total distance traveled for $39\,\mu s$

$$6\,cm$$

Reflector depth for $52\,\mu s$

$$4\,cm$$

Total distance traveled for $52\,\mu s$

$$8\,cm$$

PRP (Pulse Repetition Period)

The time of flight of a pulse from the transducer to the maximum imaging depth and back; the 13 microsecond rule applies.

PRF (Pulse Repetition Frequency) in superficial structures

PRF is high for superficial structures.

Relationship: PRF and Maximum Imaging Depth

Pulse Repetition Frequency is inversely related to the maximum imaging depth.