Chapter 12 2D Imaging

60 Questions | By Colombian164l | Last updated: Mar 19, 2022 | Total Attempts: 33

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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