Lecture 8

Question 1

What is the other part of attenuation other than absoption

Answer 1

Reflection and scattering

Question 2

What is the opposite of reflection

Answer 2

Transmission

Question 3

Nothing is _______ transmission or reflection

Answer 3

100%

Question 4

What happens at each boundary point in US

Answer 4

Some of sound reflected some transmitted (goes through)

Question 5

Incidence degree in ultrasound

Answer 5

90 degrees therefore it is called perpendicular incidence

Question 6

Each tissue will have its own ______

Answer 6

Impedance

Question 7

How much sound goes through barrier and how much reflects is dependent o n

Answer 7

Impedance

Question 8

Net impedance (difference) can be defined by

Answer 8

Acoustic impedance mismatch

Question 9

Amount of reflection depends on

Answer 9

Net impedence

Question 10

What does does net impedance decide

Answer 10

If it will produce strong or weak echo

If it will show bright or dark

Question 11

Higher net impedance the ____ the echo

Answer 11

Brighter

Question 12

Aneochic structures will have _____ transmission

Answer 12

Total

Question 13

Two body structures that would have total reflection

Answer 13

Bone and diaphragm