Describing pulsed waves Ch 4

Question 1

Units for pulse duration

Answer 1

us micro seconds

Question 2

Source of pulse duration

Answer 2

Sound source

Question 3

of cycles x period or # of cycles/ frequency

Answer 3

pulse duration

Question 4

The distance that a pulse occupies in space from the start to the end of a pulse

Answer 4

Spatial pulse length

Question 5

Source of spatial pulse length

Answer 5

source and the medium

Question 6

Units for spatial pulse length

Answer 6

mm

Question 7

Is pulse duration adjustable

Answer 7

No

Question 8

Is spatial pulse length adjustable

Answer 8

No

Question 9

The time from the start of one pulse to the start of the next pulse (one pulse duration plus one listening time)

Answer 9

Pulse repetition period

Question 10

Units for Pulse repetition period

Answer 10

ms milli second

Question 11

Source for pulse repetition period

Answer 11

sound source

Question 12

Is pulse repetition period adjustable and why

Answer 12

yes; because it is determined by depth

Question 13

How are pulse repetition period and depth related?

Answer 13

directly

Question 14

The two components of pulse repitition period

Answer 14

transmitt time and receive time

Question 15

The number of pulses that an ultrasound system transmits into the body each second

Answer 15

Pulse repetition frequency

Question 16

Units for pulse repetition frequency

Answer 16

Hz

Question 17

Source for pulse repetition frequency

Answer 17

sound source

Question 18

Is pulse repetition frequency adjustable

Answer 18

Yes

Question 19

Is pulse repetition frequency related to frequency?

Answer 19

No

Question 20

How are pulse repetition frequency and depth related?

Answer 20

inversely

Question 21

Is pulse repetition period related to period?

Answer 21

No

Question 22

How are pulse repetition period and pulse repetition frequency related?

Answer 22

inversely

Question 23

How are pulse repetition frequency and depth related?

Answer 23

inversely

Question 24

Is pulse repetition frequency adjustable?

Answer 24

Yes

Question 25

The percentage or fraction of time that a system transmits a pulse

Answer 25

Duty factor

Question 26

Source for duty factor

Answer 26

sound source

Question 27

Is duty factor adjustable?

Answer 27

yes

Question 28

How are duty factor and depth related?

Answer 28

inversely

Question 29

Which parameters are determined by sound source?

Answer 29

Pulse duration, pulse repetition period, pulse repetition frequency, and duty factor

Question 30

Which parameters do not change with depth?

Answer 30

Pulse duration and spatial pulse length

Question 31

Which parameter is determined by both sound source and medium?

Answer 31

spatial pulse length

Question 32

Which parameters can be changed with imaging depth?

Answer 32

pulse repetition period, pulse repetition frequency, and duty factor

Question 33

The actual time from start of a pulse to the end of that pulse. (single trasmit talking time)

Answer 33

Pulse duration

Question 34

Typical Value for Pulse duration

Answer 34

0.5 to 3.0 us

Question 35

Typical value for Pulse repetition period

Answer 35

0.1 to 1.0 ms

Question 36

Typical value for Pulse repetition frequency

Answer 36

1 to 10 kHz

Question 37

Typical value for Spatial pulse length

Answer 37

0.1 to 1.0 mm

Question 38

Typical value for Duty Factor

Answer 38

0.2% to 0.5%

Question 39

Two characteristics of long duration

Answer 39

Many cycles in the pulse or individual cycles wtih long periods

Question 40

Two characteristics of short duration

Answer 40

Few cycles in the pulse or individual cycles with short periods

Question 41

Clinical imaging typically contains how many cycles?

Answer 41

2 to 4 cycles

Question 42

of cycles x period =

Answer 42

Pulse duration

Question 43

Two characteristics create long pulse

Answer 43

Many cycles in the pulse or cycles with longer wavelengths.

Question 44

Two characteristics create short pulse length

Answer 44

Fewer cycles in the pulse or cycles with shorter wavelengths

Question 45

cycles x wavelength

Answer 45

Spatial pulse length

Question 46

Are pulse repetition period and pulse repetition frequency inversely related?

Answer 46

yes

Question 47

Pulse duration / pulse repetition period x 100

Answer 47

Duty Factor