Chapter 9, 10 & 11

Question 1

Wider transducer diameter equals ______ focal depth

Answer 1

Higher

Question 2

Smaller transducer diameter equals ______ focal depth

Answer 2

Less

Question 3

High frequency transducer equals_____ focal depth

Answer 3

Higher

Question 4

Low frequency transducers equal ______ focal depth

Answer 4

Shorter

Question 5

High frequency transducers equal _______ divergence

Answer 5

Less

Question 6

Low frequency transducers equal____ divergence

Answer 6

More

Question 7

Higher transducer diameter equals_____ divergence

Answer 7

Less

Question 8

Smaller transducer diameter equals______ divergence

Answer 8

More

Question 9

Axial resolution other names

Answer 9

Longitudinal, axial, range, radial, depth (LARRD)

Question 10

Axial resolution is the ability of the system to display two structures that are______ to the sound beam

Answer 10

Parallel

Question 11

Is axial resolution adjustable?

Answer 11

No

Question 12

Lateral resolution other names

Answer 12

Lateral, angular, transverse, azimuthal (LATA)

Question 13

Lateral resolution is the ability of the system to display two structures that are _____ to the sound beam

Answer 13

Perpendicular

Question 14

B-mode stands for

Answer 14

Brightness

Question 15

A-mode stands for

Answer 15

Amplitude

Question 16

On A-mode the x-axis represents the:

Answer 16

Depth

Question 17

On A-mode, the y-axis represents the:

Answer 17

Amplitude

Question 18

On B-mode the x-axis represents the

Answer 18

Depth

Question 19

Z-axis in b-mode indicates what

Answer 19

Different shades of gray

Question 20

On M-mode, the y-axis represents the

Answer 20

Depth

Question 21

On m-mode the x-axis represents the

Answer 21

Time

Question 22

Far zone is also known as

Answer 22

Fraunhofer zone

Question 23

Near zone is also known as

Answer 23

Fresnel zone

Question 24

The width of sound beam at the focus is _____ the sound beam as it leaves the transducer

Answer 24

Half

Question 25

What are other names for spherical waves

Answer 25

Diffraction patterns or Huygens wavelets

Question 26

The interference of many spherical waves create the shape of the sound beam. What principle explains this

Answer 26

Huygens principle

Question 27

Axial resolution improves with

Answer 27

Shorter pulses

Question 28

Axial resolution is determined by_______ and remains constant

Answer 28

Spatial pulse length

Question 29

Lateral resolution is best with

Answer 29

Narrowest beam

Question 30

Lateral resolution changes with

Answer 30

Depth

Question 31

Lateral resolution is best at

Answer 31

Focus

Question 32

High frequency improves lateral resolution in the far field only, explain why

Answer 32

Less divergence

Question 33

Which one is better axial resolution or lateral, and understand why

Answer 33

Axial, because the beam is shorter than it is wider

Question 34

What are the three methods of focusing

Answer 34

Electronic (phased array), external and internal (fixed)