Chapter 4

Question 1

Transmit

Answer 1

talking, or “on time”

Question 2

Receive

Answer 2

listening, or “off time”

Question 3

Pulse Duration

Answer 3

The time from the start of a pulse to the end of the pulse; a single transmit, talking, or “on” time
Units: µs, ms
Typical values: .2 to 2 µs

Question 4

Spatial Pulse Length

Answer 4

distance from the start to the end of a pulse; (distance that a pulse occupies in space)
Units: mm
Typical values: .3-3 mm
Determined by the sound source and the medium

Question 5

Pulse Repetition Period

Answer 5

The time from the start of one pulse to the start of the next pulse
Units: ms
Typical values: 100 µs to 1 ms

Question 6

Pulse Repetition Frequency

Answer 6

the number of pulses that an US system transmits into the body each second
Units: KHz
Typical value: 1-10 kHz
Determined by the sound source (imaging depth)

Question 7

Duty Factor

Answer 7

Is the percentage of time that the system is transmitting a pulse
Units: represented as a percentage
Typical values: .2% to .5%; .002 to .005