Chapter 4 Flashcards by Ayuob Salem

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

Pulse Duration

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

Pulse Duration

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Pulse duration is reported in units of ______.

time ex: microseconds

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

0.3 to 2.0 us.

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Pulse Duration is determined by the ______ only.

Sound

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Pulse duration = __________ X ____________.

cycles x period

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Pulse duration = ___________ /___________.

cycles / frequency.

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

shorter duration pulses because they create images of greater accuracy.

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

Spatial Pulse Length

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What units are used for spatial pulse length?

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

0.1 to 1.0 mm

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What is spatial pulse length determined by?

The source and the medium.

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Equation for spatial pulse length (mm)=

cycles X wavelength (mm)

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

directly proportional

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Pulse duration is _____________ to period.

Directly proportional

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Pulse duration is ___________ to frequency.

Inversely proportional

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Pulse Duration

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

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Pulse Duration

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

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time ex: microseconds

Pulse duration is reported in units of ______.

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0.3 to 2.0 us.

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

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Sound

Pulse Duration is determined by the ______ only.

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cycles x period

Pulse duration = __________ X ____________.

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cycles / frequency.

Pulse duration = ___________ /___________.

# ad shorter duration pulses because they create images of greater accuracy.

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

# ad Spatial Pulse Length

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

# ad mm

What units are used for spatial pulse length?

# ad 0.1 to 1.0 mm

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

# ad What is the spatial pulse length determined by?

the source and the medium

# ad cycles X wavelength (mm)

Equation for spatial pulse length (mm)=

# ad directly proportional

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

# ad Directly proportional

Pulse duration is _____________ to period.

# ad Inversely proportional

Pulse duration is ___________ to frequency.

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

Directly proportional

# ad Spatial pulse length is ____________ wavelength.

Directly proportional

# ad Spatial pulse length is _________ to frequency.

Inversely proportional

# ad \_\_\_\_ ________ \_\_\_\_\_\_\_ is the time from the start of one pulse to the start of the next pulse

Pulse repetition period

# ad Pulse repetition period is reported in units of what?

time, such as ms.

# ad PRP is determined by the _______ source.

Sound

# ad PRP is determined by the ___________ that the sonographer selects.

imaging depth.

# ad PRP is unrelated to \_\_\_\_\_\_\_.

Period

# ad PRP and imaging depth are \_\_\_\_\_\_\_\_\_\_.

Directly related.

# ad What are the two components of PRP.

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

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

Pulse repititon frequency

# ad Pulse repetition freuqency is reported in the units of \_\_\_\_.

# ad Pulse repetition frequency is determined by the \_\_\_\_\_\_\_\_.

Sound source

# ad Shallow, PRF is \_\_\_\_\_.

higher

# ad Deep, PRF is \_\_\_\_\_.

Lower

# ad How are pulse repetiton frequency and depth of view related?

inversely related

# ad PRP and PRF are

inversely related

# ad \_\_\_\_\_\_ ________ is the percentage or fraction time that the system transmits a pulse.

Duty factor

# ad In clinical imaging, duty factor ranges from _____ to \_\_\_\_\_.

0.002 to 0.005

# ad 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.

0.2%

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

100%

# ad Duty factor is determined by the ______ only.

Sound source

# ad Duty factor =

pulse duration/prp X 100%

# ad Shallow imaging =

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

# ad Deep imaging =

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