Chapter 12 Flashcards Preview

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Flashcards in Chapter 12 Deck (17):
1

Loss of entire image

Mechanical

2

Dropout of image information from the top to the bottom of the image. The location of the line corresponds to the broke crystal

Linear and Convex arrays

3

Erratic steering and focusing. The extent to which the image is affected is variable

Phased arrays

4

A horizontal or side-to-side band of dropout at a particular depth

Annular phased arrays

5

Sector, mechanical, fixed, one and disc shape, image loss

Mechanical

6

Rectangular electronic, electric, approx 200 rectangular, vert line dropout

Linear sequential, or switched

7

Sector, electronic, electronic approx 200 rectangular, poor steering and focusing

linear phased array

8

Sector, mechanical, electronic, 5 ring, horizontal line dropout

annular phased array

9

always means adjustable or multi focus

phased array

10

When a spike pattern is a straight line

Is an unfocused sound beam

11

The sound beam is steered if the spike line has a?

Slope

12

The sound beam is focused if the spike pattern is?

Curved

13

Steering

Slope

14

Transmit focusing

curvature

15

Shame and number of active elements in the transducer

automatic redirection of the sound beams to create and image

Focusing of each sound beam

shape of two dimensional image

consequences of damaged or nonfuction active element in the probe

five characteristices of each transducer style

16

Linear- Active elements are arranged in a straight line.
Annular- Elements are arranged as circular rings with a common center
Convex- Active elements are arranged in a bowed or arched line. The transducer may also be called a curved or curvilinear array.

3. Transducer arrays

17

Used to make sound beam narrow over a greater range of depths and thus optimizes lateral resolution
-Change number of crystals, used to transmit pulse and receive

Dynamic apperture