Axial And Lateral Resolution

Question 0

Name the synonyms for axial resolution.

Answer 0

Longitudinal, axial, range, radial, depth

Question 1

The ability to distinguish two structures that are close to each other front to back, parallel to, or along the beam’s main axis

Answer 1

Axial resolution

Question 2

Does a shorter or longer pulse provide better axial resolution?

Answer 2

A short pulse means a short spatial pulse length or a short pulse duration, and provides better axial resolution.

Question 3

What is the equation for axial resolution?

Answer 3

Axial resolution (mm)= spatial pulse length (mm)/2

Question 4

What in improves axial resolution?

Answer 4

Less ringing

Higher frequency

Question 5

Is axial resolution best or worst when using transducers with the highest frequency and the fewest number of cycles per pulse?

Answer 5

Axial resolution is best when using transducers with the highest frequency and the fewest number of cycles per pulse.

Question 6

The minimum distance that two structures are separated by side to side or perpendicular to the sound beam that produces two distinct echoes.

Answer 6

Lateral resolution

Question 7

What are synonyms for lateral resolution?

Answer 7

Lateral, angular, transverse, Azimuthal

Question 8

What is the formula for lateral resolution?

Answer 8

Lateral resolution equals beam diameter. The lateral resolution is best at the focus or one near zone length because the sound beam is narrowest at that point.

Question 9

What are the two general types of focusing?

Answer 9

1. Fixed, also called conventional or mechanical

2. Adjustable by electronics – called phased array

Question 10

How does mechanical focusing work?

Answer 10

Either using a lens-external focusing, or a curved Crystal-internal focusing.