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Flashcards in System reverse Deck (44)
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31
reverse

Adjustable

Only weak signbals affected

Strong signals remain unchanged

Weak echoes appear or are eliminated from image

Reject Overview

32
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Displays the information from returning echoes

2 user controls

brightness

contrast

CRT 

Monitor

33
reverse

patient exposure to sound energy is affected by output power NOT by reciever amplification

Output Power

vs

Reciever Gain

34
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changes brightness of image

alters signal to noise ratio

alters patient exposure

bioeffect concerns

decrease this first if image too bright

Output Power SUmmary

35
reverse

Changes brightness of entire image

does not affect signal to noise ratio

does not change patient exposure

NO bioeffect concern

increase this first if image is too dark

Reciever Gain Summary

36
reverse

frame averaging that allows echo information to be accumulated over time

 

Persistance

37
reverse

subtle texture differences will be enhanced

Persistence Increase

38
reverse

allows user to evaluate moving structures more easily

Persistence Decrease

39
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allows image magnification by increasing the pixal size

2 types

Read

Write

Zoom/Magnification

40
reverse

occurs after the image is stored

number of pixals or scan lines is the same as original image

Can appear blurry 

Read Zoom

41
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Occurs while active scanning

box is placed on screen and the area seen within can be expanded to fill screen

number of pixals and scan lines remain the same

image is not degraded

Write Zoom

42
reverse

Markers available to measure distance

linear

ellipsoid

trace

Calipers

43
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allows the labeling of the image

may be keyboard or preprogrammed keys

may be voice activated

Annotation

44
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allows the screen to be split in order to show 2 views of an image or compare anatomy of abnormal side to normal side

Dual image