Physics 1 Test Ch 10, 11

Question 1

Axial resolution is associated with..

Answer 1

Shorter spatial pulse length 
Short pulse duration
High frequency
Fewer cycles per pulse
Lower numerical values

Question 2

Resolution

Answer 2

The ability to accurately distinguish 2 structures laying close together.

Question 3

Axial resolution is measured in

Answer 3

Distance (mm and cm)

Question 4

Axial resolution

Answer 4

Measures the ability of a system to display 2 structures that are parallel to the sound beams main axis

Question 5

Lateral resolution

Answer 5

The ability to identify 2 structures that are perpendicular to the sound beams main axis.

Question 6

All names for Lateral resolution

Answer 6

Lateral
Angular
Transverse
Azimuthal

Question 7

Axial resolution is determined by

Answer 7

Pulse length

Question 8

Lateral resolution is determined by

Answer 8

Beam width

Question 9

Does axial resolution change.

Answer 9

No

Question 10

Does lateral resolution change?

Answer 10

Yes. Changes with depth. Best at focus.

Question 11

Axial resolution is best in near field with….

Answer 11

Shortest pulse

Question 12

Axial resolution is best in far field with..

Answer 12

Shortest pulse

Question 13

Lateral resolution is best in near field with…

Answer 13

Smallest diameter crystal

Question 14

Lateral resolution in far field is best with…

Answer 14

Largest diameter and highest frequency.

Question 15

Axial resolution is best with…

Answer 15

Shortest pulse
Highest frequency
Fewest cycles

Question 16

Lateral resolution is best with..

Answer 16

Narrowest beam.

Best at focal point.

Question 17

External focusing

Answer 17

With a lens

Question 18

Internal focusing

Answer 18

With a curved active element

Question 19

Phased array focusing

Answer 19

With electronics of the ultrasound system

Question 20

Lens focusing is

Answer 20

External
Fixed
Conventional
Mechanical

Question 21

Curved active element is

Answer 21

Internal
Fixed
Conventional
Mechanical

Question 22

Electronic focusing is

Answer 22

Phased array

Adjustable

Question 23

All names for axial resolution

Answer 23

Longitudinal
Axial
Range
Radial
Depth

Question 24

Most common form of fixed focusing is..

Answer 24

Internal focusing

Question 25

Curvature of PZT is..

Answer 25

Internal focusing

Question 26

As the curvature of the PZT becomes more pronounced...

Answer 26

The degree of focusing increases.

Question 27

Phased array means...

Answer 27

Adjustable or multiple focusing.

Question 28

The 4 effects of focusing

Answer 28

Beam diameter in near field and focal zone are reduced. Focal depth is shallower. Beam diameter in far zone increases. Focal zone is smaller.

Question 29

Frequency of continuous waves is determined by...

Answer 29

Frequency of electrical signal from the ultrasound system.

Question 30

Frequency of a pulsed wave is determined by...

Answer 30

Thickness of ceramic and speed of sound in ceramic.

Question 31

Focal length is determined by...

Answer 31

Diameter of ceramic and frequency of sound.

Question 32

Beam divergence is determined by...

Answer 32

Diameter of ceramic and frequency of sound.

Question 33

A-mode

Answer 33

Amplitude

Question 34

B-mode

Answer 34

Brightness

Question 35

M-mode

Answer 35

Motion

Question 36

X axis for a-mode measures...

Answer 36

Reflector depth.

Question 37

Y axis on a-mode represents

Answer 37

Strength/amplitude.

Question 38

X axis for b-mode measures

Answer 38

Depth.

Question 39

X axis measures what for m-mode

Answer 39

Time.

Question 40

Y axis measures what in m-mode.

Answer 40

Depth.

Question 41

Z axis measures what in b-mode.

Answer 41

Amplitude.

Question 42

What does y-axis measure in b-mode?

Answer 42

Nothing.