Sound travels only in a straight line
Sound beams must be narrow to opitmize lateral resolution
Multiple pulses
Less pulses
A straight line
Few pulses
One pulse at a time
Multiple pulses
Disc shaped
Rectangular shaped
1
2
3
10
True
False
Electronic steering
Mechanical steering
True
False
Internal focusing
External focusing
Both internal and external focusing
None
True
False
Entire image is lost
Portion of the image is lost
Nothing happens
Turns black and grey
True
False
Elements
Slopes
Waves
Pulses
Active element, wire, and system electronics
Crystal,backing material, gel
System electronics,pzt,skin
Linear
Vector
Annular
Convex
1cm on each side
2cm on each side
1.5cm on each side
.1cm on each side
True
False
100-300
100-200
100
100-400
True
False
1/4 to 1/2 of the sounds wavelength
1/3/ to 1/2 of the sounds wavelength
1/5 to1/3 of the sounds wavelength
Fan or sector shaped
Rectangular
Circular
True
False
True
False
Inconsistant or erratic beam steering
No image
True
False
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