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Ultrasound physics - Book questions > Chapter 4 - p.95 > Flashcards

Chapter 4 - p.95 Flashcards

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1
Q

The frequency and the __________ are reciprocals

A

period

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2
Q

The pulse repetition frequency and the _________ repetition ______________ are reciprocals

A

pulse

period

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3
Q

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

A

PRP

time (seconds)

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4
Q

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

A

PRF
Frequency
Hertz

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5
Q

The _________- is the time between pulses repeating

A

PRP

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6
Q

The ___________ is the frequency at which the pulses repeat

A

PRF

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7
Q

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

A

PRF

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8
Q

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

A

time

lines

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9
Q

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

A

12 msec

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10
Q

The pulse duration has units of _________

A

time

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11
Q

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

A

pulse duration

4 msec

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12
Q

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

A

6 cycles

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13
Q

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

A

period

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14
Q

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

A

pulse duration

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15
Q

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

A

duty cycle

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16
Q

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

A

pulse repetition period (PRP)

17
Q

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

A

total time,
duty
duration

18
Q

The duty cycle is also called the duty _________.

A

factor

19
Q

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

A

1

20
Q

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

A

0.5

21
Q

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

A

0.33 msec

22
Q

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

A

2 seconds

23
Q

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

A

distance

time

24
Q

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

A

Spatial pulse length

25
Q

The operating frequency is the same as the transmit _____________

A

frequency

26
Q

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

A

bandwidth

27
Q

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

A

fractional

28
Q

THe quality factor is the inverse of the ________ bandwidth

A

fractional

29
Q

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 ___________

A

bandwidth

30
Q

A shorter pulse duration leads to a wider ________–

A

bandwidth

31
Q

__________ spectral Doppler requires the least bandwidth.

A

CW

32
Q

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

A

2 MHz

33
Q

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

A

Backing material (damping material)

34
Q

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

A

spatial pulse length

35
Q

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

A

range

Ultrasound physics - Book questions (11 decks)

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