Chapter 4 - p.95

Question 1

The frequency and the __________ are reciprocals

Answer 1

period

Question 2

The pulse repetition frequency and the _________ repetition ______________ are reciprocals

Answer 2

pulse

period

Question 3

The _________, like the period, has units of ________________.

Answer 3

PRP

time (seconds)

Question 4

The ______________ like the _____________ has units of one over time , which has the name _________

Answer 4

PRF
Frequency
Hertz

Question 5

The _________- is the time between pulses repeating

Answer 5

PRP

Question 6

The ___________ is the frequency at which the pulses repeat

Answer 6

PRF

Question 7

The deeper the imaging depth , the lower the __________ or the more time it takes before repeating a pulse.

Answer 7

PRF

Question 8

The frame ________ depends on how much time it takes to shoot one line, and the number of _________ within the frame.

Answer 8

time

lines

Question 9

If one line take 0.1 msec, and there are 120 lines in one frame, the frame time is ____________.

Answer 9

12 msec

Question 10

The pulse duration has units of _________

Answer 10

time

Question 11

If a pulse has 4 cycles and each cycle last 1 msec, the ________ ____________ equals _____________.

Answer 11

pulse duration

4 msec

Question 12

If a pulse has __________ and each cycle last 2 msec, then the pulse duration equals 12 msec.

Answer 12

6 cycles

Question 13

The time for a cycle to repeat itself is called the ____________-

Answer 13

period

Question 14

The ______________ equals the number of cycles multiplied by the time for one cycle to occur ans is called the period.

Answer 14

pulse duration

Question 15

The __________ ____________ is the percentage of time the pulse is on divided by the total time between repeating pulses.

Answer 15

duty cycle

Question 16

The “total time” between repeating pulses is called the __________ __________ ___________

Answer 16

pulse repetition period (PRP)

Question 17

Since the duty cycle is the “on time” divided by the ________, the ________ cycle equals the pulse _________ divided by the pulse repetition period.

Answer 17

total time,
duty
duration

Question 18

The duty cycle is also called the duty _________.

Answer 18

factor

Question 19

A duty factor of _________ means the pulse is always on/

Answer 19

1

Question 20

A duty factor of __________ means the pulse duration equals one half the pulse repetition period

Answer 20

0.5

Question 21

If the duty cycle is 0.33 and the PRP is 1 msec, then the pulse duration is ____________.

Answer 21

0.33 msec

Question 22

IF the duty cycle is .33 and the pulse duration is 0.66 seconds, then the PRP is ________-.

Answer 22

2 seconds

Question 23

THe spatial pulse has units of ________ whereas the pulse duration has units of __________

Answer 23

distance

time

Question 24

The ________ ________ __________ equals the number of cycles multiplied by the wavelength.

Answer 24

Spatial pulse length

Question 25

The operating frequency is the same as the transmit _____________

Answer 25

frequency

Question 26

The -___________ is defined as the maximum frequency minus the minimum frequency over which a transducer or system has sensitivity

Answer 26

bandwidth

Question 27

THe _________ bandwidth is defined as the divided by the operating frequency

Answer 27

fractional

Question 28

THe quality factor is the inverse of the ________ bandwidth

Answer 28

fractional

Question 29

Since the fractional bandwidth equals the bandwidth divided by the operating frequency, and since the quality factor is the inverse of the fractional bandwidth , the quality factor equals the operating frequency divided by the ___________

Answer 29

bandwidth

Question 30

A shorter pulse duration leads to a wider ________--

Answer 30

bandwidth

Question 31

__________ spectral Doppler requires the least bandwidth.

Answer 31

CW

Question 32

Transmitting at 2 MHz implies that the center frequency of the bandwidth being used is _________.

Answer 32

2 MHz

Question 33

A _______ __________ is used to shorten the ringdown of a transducer

Answer 33

Backing material (damping material)

Question 34

Shortening the ring down of a transducer also shortens the -________ _______ ________ improving range resolution.

Answer 34

spatial pulse length

Question 35

The motivation for using a pulsed mode instead of a continuous mode is because CW has no ___________ resolution.

Answer 35

range