Flashcards in chapter 12 Q and A's Deck (15):
1
True or False. Mechanical scanning ;produces pictures that are similar in shape to linear phased array images
Ture. Mechanical scanning and linear phased arrays create sector-shaped images
2
T or F. Many active elements fire at almost the same time in a mechanical scanner
False there is only one active element in a mechanical scanner
3
T or F many active elements fire at almost the same tiime in a phased array scanner
T many active elements fire at almost the same time in a phased array scanner
4
Transducer is best described as mechanically steered and fixed single focused?
Mechanical transducer steers the sound beam mechanically. The sound beam has a single fixed focus
5
Best describes as mechanically steered and Multic-focus?
Annular phased array transducer
6
Transducers creates a rectangular shaped image?
Linear sequential array transducer
7
A Linear phased array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?
128
8
A linear sequential array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?
a small group
9
In a linear phased arrays, what is the firing pattern that steers a beam to the left or right?
Electronic slope
10
In linear phased arrays, what is the firing pattern that focuses a sound beam?
Electronic curvature
11
T or F there are large time delays in the firing pattern of a linear phased array transducer
F there are tiny time delays in the firing patter of a linear phased array transducer
12
T or F a machine that displays A-mode and two-dimensional images is called a duplex scanner
False A machine that displays doppler and two dimensional images is called duplex scanner
13
Improves elevation resolution?
One and one half dimensional array
14
T or F side lobes degrade axial
F
15