# SPI - Unit 3 - Pulse

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1. What is Round Trip Travel Time in soft tissue?
2. Define Pulse Duration. What is it's formula? What is it measured in?
PD (Pulse Duration) is temporal pulse length, is the time the machine is sending the signal, measured in units of length (cm, m, etc.)

3. Define Pulse Repitition Period. What is it's formula? What is it measured in?
PRP (Pulse Repition Period) is the time that the machine is sending the signal and recieving echoes, measured in units of time (sec, usec, etc.)

4. Define Pulse Repitition Frequency. What is it's formula? What is it measured in?
PRF (Pulse Repitition Frequency) is the number of pulses per second, measured in Hertz (Hz).

5. What is the formula for PRPmin? PRFmax?
6. Define Duty Factor. What is it's formula? What is it measured in?
DF (Duty Factor) is the fraction or percentage of time that the machine is "on", it is a ratio (no units) or a percentage (%).

7. What are the Duty Factor ranges for imaging?
.001-.01 or .1-1%
8. Define Spatial Pulse Length. What is it's formula? What is it measured in?
SPL (Spatial Pulse Length) is the length or distance that the pulse occupies in space, measured in units of distance (m, cm, etc.)

SPL = n · λ = v · t = PD · v
 Author: dylan.sies ID: 142172 Card Set: SPI - Unit 3 - Pulse Updated: 2012-03-18 21:11:23 Tags: tanya mcvay physics MIT 231 Folders: Description: Unit 3 - Pulse Show Answers: