Chapter 13

Question 1

Static scanning

Answer 1

Early in ultrasound images were displayed one frame at a time

Question 2

Real-time imaging

Answer 2

each frame is created and displayed very quickly, providing the impression of constant motion

Question 3

Frame Rate

Answer 3

is measured in hertz (frames or images per second)

Question 4

Temporal Resolution

Answer 4

is the ability to precisely position moving structures from instant to instant

Question 5

Temporal Resolution

Answer 5

is the ability to precisely position moving structures from instant to instant
determined by frame rate

Question 6

2 settings that determine frame rate

Answer 6

1. Imaging depth
2. Number of pulses per frame

Question 7

Frame rate and imaging depth are inversely related

Answer 7

frame rate increases, depth decreases

Question 8

Frame rate and # of Pulses per frame are inversely related

Answer 8

frame rate increases, # of pulses decreases

Question 9

Three factors determine the # of pulses per frame

Answer 9

1. # of pulses per scan line (multi vs. single focus)
2. Sector size
3. Lines per angle of sector (line density)

Question 10

Number of pulses per scan line

Answer 10

determined by the # of foci

Question 11

Choosing a larger sector size (or field of view)

Answer 11

increases the # of pulses per frame and decreases the frame rate and temporal resolution

Question 12

Line density

Answer 12

The # of lines per frame

Question 13

Closely spaced lines

Answer 13

= high line density = more pulses per frame

Question 14

Line Density Knob

Answer 14

Toggle to high = high line density
Toggle to low = low line density

Question 15

Res/Speed Knob

Answer 15

Toggle to Resolution = high line density
Toggle to Speed = low line density

Question 16

Increased detail in an image =

Answer 16

Better spatial resolution

Question 17

lateral resolution improves with

Answer 17

multi focusing

Question 18

spatial resolution improves with

Answer 18

higher line density