Chapter 17: Harmonics And Contrast

Question 1

What are the two forms of harmonics

Answer 1

Tissue harmonics and contrast harmonics

Question 2

What is the fundamental frequency

Answer 2

The original frequency created by the transducer

Question 3

Harmonic frequency sound arises from _______ behavior

Answer 3

Nonlinear

Question 4

Tissue harmonics is created during ________, as a result of sound interacting with tissue

Answer 4

Transmission

Question 5

Sound travels faster through compressions and slower through ______

Answer 5

Rarefactions

Question 6

Harmonics ________ signal to noise ratio

Answer 6

Increases

Question 7

Harmonics are processed by the machine by two ways:

Answer 7

Pulse inversion and power modulation

Question 8

Contrast agents must be

Answer 8

Metabolically inert

Question 9

Contrast harmonics are created during _____

Answer 9

Reflection

Question 10

The non-linear behavior in contrast harmónica is also called

Answer 10

Resonance

Question 11

Resonance refers to the shrinking and _____ of the bubbles

Answer 11

Expanding

Question 12

Bubbles ______ to a greater extent than they compress

Answer 12

Expand

Question 13

Micro bubbles resonate from the sound in the ______ MHz range

Answer 13

2-4

Question 14

Contrast harmonics signals are ________ than tissue harmonics

Answer 14

Stronger

Question 15

What does the mechanical index do

Answer 15

Estimates the contrast harmonics that will be created by sound bean

Question 16

Lower mechanical index means less pressure and ______ frequency

Answer 16

Higher

Question 17

Higher mechanical index means more pressure and ______frequency

Answer 17

Lower

Question 18

The ideal higher mechanical index is from 0.1 to _____

Answer 18

1.0