Basics of Scanning

Question 1

High frequency transducer for superficial imaging that provides a rectangular image

Answer 1

Linear transducer

Question 2

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

Answer 2

Time Gain Compensation

Question 3

Controlled through slide pods or a 3-knob control

Answer 3

Time Gain Compensation

Question 4

Transducer that produces sector images

Answer 4

Curvilinear array transducer

Question 5

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

Answer 5

2

Question 6

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

Answer 6

Reverberation artifact

Question 7

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

Answer 7

Read zoom

Question 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?

Answer 8

Mirror image

Question 9

What is power output measured in?

Answer 9

Decibels

Question 10

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

Answer 10

Reverberation artifact

Question 11

Curvilinear probe freqeuncy

Answer 11

2-5 MHz

Question 12

Phased array probe frequency

Answer 12

2-5 MHz

Question 13

What is produced when closely spaced reverberations merge?

Answer 13

Ring down (comet tail) artifacts

Question 14

Linear probe frequency

Answer 14

5-10+ MHz

Question 15

Controls the strength or intensity of the sound wave

Answer 15

Power output

Question 16

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

Answer 16

1540m/s

Question 17

What improves image quality particularly in obese patients?

Answer 17

Tissue harmonics imaging (THI))

Question 18

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

Answer 18

Focal zone

Question 19

ALARA means

Answer 19

As Low As Reasonable Achievable

Question 20

The degree of amplification of the returning sound

Answer 20

Gain

Question 21

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

Answer 21

Shadowing

Question 22

What can be used to minimize shadowing and posterior enhancement?

Answer 22

Compound imaging

Question 23

True magnification of the desired area. The pixels are reallocated

Answer 23

Write zoom

Question 24

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

Answer 24

Phased array

Question 25

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

Answer 25

Posterior enhancement