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Physics CH 4 & 5
Chapter 4 & 5
27
Physics
Undergraduate 2
10/15/2014

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Term
Pulse Ultrasound
Definition
A collection of cycles that travel together
Term
Two components of Pulsed Ultrasound
Definition

Cycles: on time, transmit time

 

Dead time: off time, receive time, read time, listening time

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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