Chapter 12 2D Imaging
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- 1.What characteristics of sound make it difficult to create two dimensional images?
- A.
Sound travels only in a straight line
- B.
Sound beams must be narrow to opitmize lateral resolution
- C.
Multiple pulses
- D.
Less pulses
- 2.What overcomes the difficulties of two dimensional images?
- A.
A straight line
- B.
Few pulses
- C.
One pulse at a time
- D.
Multiple pulses
- 3.The mechanical transducer has what kind of shape?
- A.
Disc shaped
- B.
Rectangular shaped
- 4.How many crystals does the mechanical transducer hold?
- A.
1
- B.
2
- C.
3
- D.
10
- 5.The image created by by a mechanical transducer is fan or sector shaped
- A.
True
- B.
False
- 6.The 2 dimensionalimage is built up by rotating the crystal with a .
- 7.In mechanical beam steering the scan plane is created through?
- A.
Electronic steering
- B.
Mechanical steering
- 8.Mechanical transducers have a fixed focal depth
- A.
True
- B.
False
- 9.Mechanical transducers use 2 methods of fixed focusing which are:
- A.
Internal focusing
- B.
External focusing
- C.
Both internal and external focusing
- D.
None
- 10.With a mechanical transducer, the pzt crystal is physically moved to create the image.
- A.
True
- B.
False
- 11.With the mechanical transuder, if the PZT crystal is damaged. What happens to the image?
- A.
Entire image is lost
- B.
Portion of the image is lost
- C.
Nothing happens
- D.
Turns black and grey
- 12.Arrays contain only one element
- A.
True
- B.
False
- 13.An array comprises a single slab of PZT cut into a collectoinof seperate pieces called:
- A.
Elements
- B.
Slopes
- C.
Waves
- D.
Pulses
- 14.A channel is a combnation of?
- A.
Active element, wire, and system electronics
- B.
Crystal,backing material, gel
- C.
System electronics,pzt,skin
- 15.There are several types of array transuders which are:
- A.
Linear
- B.
Vector
- C.
Annular
- D.
Convex
- 16.The face of a linear phased array is about what size?
- A.
1cm on each side
- B.
2cm on each side
- C.
1.5cm on each side
- D.
.1cm on each side
- 17.The beam is steered and focused using an electrical technique called phasing
- A.
True
- B.
False
- 18.How many crystals does the linear phased array contain?
- A.
100-300
- B.
100-200
- C.
100
- D.
100-400
- 19.Each element on the the linear phased array is rectangular and narrow
- A.
True
- B.
False
- 20.The linear phased array has elements with a width of?
- A.
1/4 to 1/2 of the sounds wavelength
- B.
1/3/ to 1/2 of the sounds wavelength
- C.
1/5 to1/3 of the sounds wavelength
- 21.The image created by a phased array transducer is:
- A.
Fan or sector shaped
- B.
Rectangular
- C.
Circular
- 22.With linear phased array transudcers, sound beams are focused mechanically
- A.
True
- B.
False
- 23.Phased array always means "adjustable" or "multi focus"
- A.
True
- B.
False
- 24.Damaged PZT crystals in linear phased array result in :
- A.
Inconsistant or erratic beam steering
- B.
No image
- 25.All active elements in a linear phased array probe are fired to create each sound beam.
- A.
True
- B.
False
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