Chapter 10

Question 1

Resolution

Answer 1

is the ability to image accurately

Question 2

Axial Resolution

Answer 2

is the minimum distance two structures can be front to back and still produce two distinct echoes on the screen
AKA Longitudinal, axial, range, radial, depth
Typical values: .15-1.5 mm

Question 3

Superior axial resolution is associated with

Answer 3

Shorter SPL and PD
Higher ƒ
Fewer cycles
Lower numerical values

Question 4

Lateral Resolution

Answer 4

the minimum distance two structures can be side by side and still produce two distinct echoes or images on the ultrasound image
AKA: angular, transverse, azimuthal

Question 5

Three methods of focusing

Answer 5

External - with a lens
Internal – with a curved active element
Phased Array focusing – with electronics

Question 6

Internal focusing

Answer 6

-may be used with single element transducers
-curved element and lens
-considered fixed, conventional, or mechanical focusing

Question 7

external focusing

Answer 7

-may be used with single element transducers
-curved element and lens
-considered fixed, conventional, or mechanical focusing

Question 8

Electronic focusing

Answer 8

-reserved for array transducers – those with multiple active elements
dynamic or adjustable i.e. focal depth can be changed and multi focuses can be used making it more versatile