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Flashcards in Basics of Scanning Deck (25):
1

High frequency transducer for superficial imaging that provides a rectangular image

Linear transducer

2

Compensates for the loss of energy in the reflected signal due to attenuation

Time Gain Compensation

3

Controlled through slide pods or a 3-knob control

Time Gain Compensation

4

Transducer that produces sector images

Curvilinear array transducer

5

An increase or decrease of the intensity by 3 dB will multiply or divide the intensity by

2

6

What artifact is a result of sound bouncing between two strong reflectors?

Reverberation artifact

7

Not a true magnification of the image. The pixels are simply enlarged

Read zoom

8

What artifact occurs when sound reflects off a strong reflector and is redirected toward a second structure which causes a second copy of the image to be seen?

Mirror image

9

What is power output measured in?

Decibels

10

Which artifact violates the assumption that sound returns directly to the transducer?

Reverberation artifact

11

Curvilinear probe freqeuncy

2-5 MHz

12

Phased array probe frequency

2-5 MHz

13

What is produced when closely spaced reverberations merge?

Ring down (comet tail) artifacts

14

Linear probe frequency

5-10+ MHz

15

Controls the strength or intensity of the sound wave

Power output

16

The average speed of a sound wave through a human body is:

1540m/s

17

What improves image quality particularly in obese patients?

Tissue harmonics imaging (THI))

18

Decreases the overall frame rate but when set at the level of the desired structure enhances that image

Focal zone

19

ALARA means

As Low As Reasonable Achievable

20

The degree of amplification of the returning sound

Gain

21

Occurs when the sound beam hits a strong reflector and the sound beam is completely or nearly completely reflected back to the transducer

Shadowing

22

What can be used to minimize shadowing and posterior enhancement?

Compound imaging

23

True magnification of the desired area. The pixels are reallocated

Write zoom

24

Contains elements in the transducer head that are pulsed as a complete group with a slight time delay

Phased array

25

What artifact occurs when a sound beam passes through a fluid-filled structure?

Posterior enhancement