chapter 12 Q and A's Flashcards Preview

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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

T of F Side lobes degrade lateral

T