# Shared Flashcard Set

## Details

Physics CH 4 & 5
Chapter 4 & 5
27
Physics
10/15/2014

Term
 Pulse Ultrasound
Definition
 A collection of cycles that travel together
Term
 Two components of Pulsed Ultrasound
Definition
Term
 Pulse Duration
Definition
 The time from the start of a pulse to the end of that pulse, the actual time that the pulse is on
Term
 Units of pulse duration
Definition
 seconds, msec- any unit of time
Term
 Pulse Duration determined by:
Definition
 Sound source
Term
 Can Pulse duration be changed by sonographer?
Definition
 No
Term
 Typical Values of Pulse Duration
Definition
 From 0.3-2.0 Usecs 2-4 cycles
Term
 Spatial Pulse Length
Definition
 The length or distance that a pulse occupies in space. The distance from the start to the end of one pulse.
Term
 Units of Spatial pulse Length
Definition
 mm, meters, any unit of distance
Term
 Spatial pulse Length is determined by
Definition
 Both the source and medium
Term
 Can spatial pulse length be changed by the sonogropher?
Definition
 no
Term
 Units of Spatial Space Length
Definition
 mm, meters, any unit of distance
Term
 Spatial Space Length is determined by
Definition
 Both the source and medium
Term
 Typical value of spatial pulse length
Definition
 0.1-1 mm
Term
 Equation for spatial pulse length
Definition
 # of cycles x wavelength
Term
 spatial pulse length is ___________ proportional to the number of cycles in the pulse and wavelength
Definition
 Directly Proportional
Term
 Spatial Pulse Length is _______ proportional to frequency
Definition
 inversely
Term
 Many cycles and cycles with longer wavelength makes _____________ pulses
Definition
 longer
Term
 Fewer cycles and cycles with shorter wavelength creates _________ pulse length
Definition
 shorter
Term
 Pulsed Repetition Period
Definition
 Pulse repetition period is the tie from the start of one pulse to the start of the next pulse. It includes one pulse duration and one "listening time"
Term
 Units of Pulsed Repetition Period
Definition
 seconds, minutes- any units of time
Term
 Pulse repetition period is determined by
Definition
 sound source
Term
 Can pulsed repetition period be changed by the sonographer
Definition
 yes
Term
 Typical values of pulsed repetition period
Definition
 from 100 microseconds to 1 milliseconds
Term
 As imaging depth increases, PR period ____________
Definition
 increases
Term
 As imaging depth decreases, PR period ____________
Definition
 decreases
Term
 Pulse Repetition
Definition
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