1.
A. 
Sound travels only in a straight line
B. 
Sound beams must be narrow to opitmize lateral resolution
C. 
D. 
2.
A. 
B. 
C. 
D. 
3.
The mechanical transducer has what kind of shape?
4.
A. 
B. 
C. 
D. 
5.
The image created by by a mechanical transducer is fan or sector shaped
6.
The 2 dimensionalimage is built up by rotating the crystal with a .
7.
In mechanical beam steering the scan plane is created through?
8.
Mechanical transducers have a fixed focal depth
9.
Mechanical transducers use 2 methods of fixed focusing which are:
A. 
B. 
C. 
Both internal and external focusing
D. 
10.
With a mechanical transducer, the pzt crystal is physically moved to create the image.
11.
With the mechanical transuder, if the PZT crystal is damaged. What happens to the image?
A. 
B. 
Portion of the image is lost
C. 
D. 
12.
Arrays contain only one element
13.
An array comprises a single slab of PZT cut into a collectoinof seperate pieces called:
A. 
B. 
C. 
D. 
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. 
B. 
C. 
D. 
16.
The face of a linear phased array is about what size?
A. 
B. 
C. 
D. 
17.
The beam is steered and focused using an electrical technique called phasing
18.
A. 
B. 
C. 
D. 
19.
Each element on the the linear phased array is rectangular and narrow
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:
22.
With linear phased array transudcers, sound beams are focused mechanically
23.
Phased array always means "adjustable" or "multi focus"
24.
Damaged PZT crystals in linear phased array result in :
A. 
Inconsistant or erratic beam steering
B. 
25.
All active elements in a linear phased array probe are fired to create each sound beam.
26.
27.
In linear phased array the curved pattern creates a foucused sound beam.
28.
The sound beam is focused if the spike line in linear phased array is curved
29.
The active elements of annular array transducers appear as shaped.
A. 
B. 
C. 
D. 
30.
The annular phased array contains how many crystals?
A. 
B. 
C. 
D. 
31.
Annular phased array transducers use steering
32.
The annular phased array transducer collects informatiom only from the shallowest depths;all other information is ignored.
33.
The annular phased arrays image is
34.
A. 
Only a portion of the image is lost
B. 
C. 
35.
36.
All is true about the linear seq. array but one:
A. 
B. 
Elements are arranged side by side
C. 
Each crystal is about 2 wavelength in width
D. 
37.
With linear seq. arrays,some but not all of the crystals are fired simultaneously to create each sound beam
38.
The linear sequential transducer has what kinda of shape image?
39.
Although a linear sequential array with a 10cm footprint may produce an 8 cm wide image, it cannot produce an image that is wider than 10cm
40.
41.
42.
Curvilinear array transducers is also known as :
A. 
B. 
C. 
D. 
43.
A convex array has up to how many crystals?
A. 
B. 
C. 
D. 
44.
In a convex array each crystal is about what width?
45.
In convex sequential array, some but not all crysatls are fired.
46.
In convex array transducers focusing is achieved :
47.
The image shape of the convex array transucer is:
48.
The curvilinear array is damaged, only the portion of the image is affected
49.
A vector array is a combination of what?
A. 
Linear sequential and linear phased array
B. 
Linear phased array and convex array
50.
The vector array has how many crystals?
51.
The vector array has a trapzoidal image
52.
53.
Which transducer types have the best elevational resoltuion?
54.
A technique called can be used to make a sound beam narrow over a greater range of depths and optimize lateral resolution
55.
Reducing the strength of the side and grating lobes can be achieved by a process called
56.
Mechanical scanning produces pictures that are similar in shape to linear phased array images
57.
Many active elements fire at almost the same time in a mechanical scanner.
58.
Many active elements are fired at almost the same time in a phased array scanner.
59.
A linear sequential array transducer has 128 crystals.how many of these crystals are fired to create a single sound beam
A. 
B. 
C. 
D. 
60.
A. 
B. 
C. 
D.