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physics review > Chapter 4 > Flashcards

Chapter 4 Flashcards

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1
Q

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_______ ________ is the actual time from the start of a pulse to the end of that pulse.

A

Pulse Duration

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2
Q

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_____ _______ is a single transmit, talking, or “on” time.

A

Pulse Duration

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3
Q

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Pulse duration is reported in units of ______.

A

time ex: microseconds

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4
Q

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The typical value of pulse duration in diagnostic ultrasound is _____ to _____ us.

A

0.3 to 2.0 us.

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5
Q

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Pulse Duration is determined by the ______ only.

A

Sound

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6
Q

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Pulse duration = __________ X ____________.

A

cycles x period

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7
Q

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Pulse duration = ___________ /___________.

A

cycles / frequency.

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8
Q

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Do you want a long pulse or short pulse in ultrasound imaging?

A

shorter duration pulses because they create images of greater accuracy.

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9
Q

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_______ _______ _______ is the distance that a pulse occupies in space from the start to the end of a pulse.

A

Spatial Pulse Length

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10
Q

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What units are used for spatial pulse length?

A

mm

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11
Q

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In clinical imaging, spatial pulse length in soft tissue ranges from _____ to _____.

A

0.1 to 1.0 mm

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12
Q

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What is spatial pulse length determined by?

A

The source and the medium.

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13
Q

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Equation for spatial pulse length (mm)=

A

cycles X wavelength (mm)

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14
Q

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Pulse duration is ___________ to the number of cycles in the pulse.

A

directly proportional

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15
Q

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Pulse duration is _____________ to period.

A

Directly proportional

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16
Q

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Pulse duration is ___________ to frequency.

A

Inversely proportional

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17
Q
A
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18
Q

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Pulse Duration

A

_______ ________ is the actual time from the start of a pulse to the end of that pulse.

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19
Q

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Pulse Duration

A

_____ _______ is a single transmit, talking, or “on” time.

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20
Q

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time ex: microseconds

A

Pulse duration is reported in units of ______.

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21
Q

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0.3 to 2.0 us.

A

The typical value of pulse duration in diagnostic ultrasound is _____ to _____ us.

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22
Q

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Sound

A

Pulse Duration is determined by the ______ only.

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23
Q

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cycles x period

A

Pulse duration = __________ X ____________.

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24
Q

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cycles / frequency.

A

Pulse duration = ___________ /___________.

25
Q

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shorter duration pulses because they create images of greater accuracy.

A

Do you want a long pulse or short pulse in ultrasound imaging?

26
Q

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Spatial Pulse Length

A

_______ _______ _______ is the distance that a pulse occupies in space from the start to the end of a pulse.

27
Q

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mm

A

What units are used for spatial pulse length?

28
Q

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0.1 to 1.0 mm

A

In clinical imaging, spatial pulse length in soft tissue ranges from _____ to _____.

29
Q

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What is the spatial pulse length determined by?

A

the source and the medium

30
Q

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cycles X wavelength (mm)

A

Equation for spatial pulse length (mm)=

31
Q

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directly proportional

A

Pulse duration is ___________ to the number of cycles in the pulse.

32
Q

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Directly proportional

A

Pulse duration is _____________ to period.

33
Q

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Inversely proportional

A

Pulse duration is ___________ to frequency.

34
Q

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Spatial pulse length is __________ to the number of cycles in the pulse.

A

Directly proportional

35
Q

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Spatial pulse length is ____________ wavelength.

A

Directly proportional

36
Q

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Spatial pulse length is _________ to frequency.

A

Inversely proportional

37
Q

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____ ________ _______ is the time from the start of one pulse to the start of the next pulse

A

Pulse repetition period

38
Q

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Pulse repetition period is reported in units of what?

A

time, such as ms.

39
Q

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PRP is determined by the _______ source.

A

Sound

40
Q

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PRP is determined by the ___________ that the sonographer selects.

A

imaging depth.

41
Q

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PRP is unrelated to _______.

A

Period

42
Q

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PRP and imaging depth are __________.

A

Directly related.

43
Q

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What are the two components of PRP.

A

The transmit time or on time, the recieve time or off time.

44
Q

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_______ _______ _______ is the number of pulses that an ultrasound system transmits into the body each second.

A

Pulse repititon frequency

45
Q

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Pulse repetition freuqency is reported in the units of ____.

A

Hz

46
Q

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Pulse repetition frequency is determined by the ________.

A

Sound source

47
Q

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Shallow, PRF is _____.

A

higher

48
Q

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Deep, PRF is _____.

A

Lower

49
Q

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How are pulse repetiton frequency and depth of view related?

A

inversely related

50
Q

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PRP and PRF are

A

inversely related

51
Q

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______ ________ is the percentage or fraction time that the system transmits a pulse.

A

Duty factor

52
Q

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In clinical imaging, duty factor ranges from _____ to _____.

A

0.002 to 0.005

53
Q

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The duty factor is usually in the range of _____, indicating that the ultrasound system spends a very small percentage of time transmitting, and a very large percentage of time (99.8) recieving.

A

0.2%

54
Q

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The duty factor is _______ for CW, because the system is always transmitting.

A

100%

55
Q

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Duty factor is determined by the ______ only.

A

Sound source

56
Q

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Duty factor =

A

pulse duration/prp X 100%

57
Q

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Shallow imaging =

A

less listening, shorter prp, higher prf, higher duty factor

58
Q

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Deep imaging =

A

more listening, longer prp, lower prf, lower duty factor

physics review (4 decks)

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