Term
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Definition
| The actual time from the start of a pulse to the end of that pulse. |
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Term
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Definition
| time such as micro seconds, milliseconds or seconds |
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Term
| Pulse duration is determined by |
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Definition
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Term
| Pulse duration is controlled by |
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Definition
| the ultrasound system and transducer |
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Term
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Definition
# cycles in pulse
pulse duration (usec) = ______________
frequency (MHz) |
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Term
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Definition
| The distance that a pulse occupies in space from the start to the end of a pulse. |
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Term
| units for spatial pulse length |
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Definition
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Term
| Typical values for spatial pulse length in soft tissue |
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Definition
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Term
| Spatial pulse length is determined by |
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Definition
| the source and the medium |
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Term
| Spatial pulse length is directly proportional to |
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Definition
the number of cycles in the pulse
and also
the wavelength |
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Term
| Spatial pulse length is inversely proportional to |
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Definition
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Term
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Definition
| the time the pulse is on typically measured in microseconds |
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Term
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Definition
| the distance of the pulse start to end typically measured in mm |
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Term
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Definition
| the time from the start of one pulse to the start of the next pulse. |
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Term
| units for pulse repetition period |
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Definition
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Term
| Typical values for pulse repetition period |
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Definition
| 100 microseconds to 1 millisecond |
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Term
| Pulse repetition period is determined by |
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Definition
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Term
| If all other factors remain the same, what happens to duty factor if the sonographer changes to a transducer with a longer pulse duration? |
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Definition
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Term
| Pulse repetition period is changed by the sonographer in what way? |
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Definition
| The operator changes on the listening time when adjusting the depth of view but never the pulse duration. |
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Term
| Pulse repetition period is determined |
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Definition
by the depth of view
as imaging depth increases, PR period increases
as imaging depth decreases, PR period decreases |
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Term
| Pulse repetition frequency (PRF) |
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Definition
| is the number of pulses that an ultrasound system transmits into the body each second. |
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Term
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Definition
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Term
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Definition
1000 to 10000 hertz
or
1 to 10 thousand pulses per second |
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Term
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Definition
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Term
| PRF is adjusted by the sonographer how? |
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Definition
| by adjusting the depth of view |
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Term
| when imaging shallow the PRF is |
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Definition
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Term
| when imaging deep the PRF is |
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Definition
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Term
| Is PRF related to frequency? |
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Definition
no
it is related only to depth of view |
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Term
| How are PRF and depth of view related? |
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Definition
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Term
| PRP and PRF are related how? |
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Definition
inversely
they are reciprocals |
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Term
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Definition
| the percentage or fraction of time that the system is transmitting a pulse |
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Term
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Definition
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Term
| typical values for duty factor |
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Definition
| 0.002 to 0.005 or 0.2% to 0.5% |
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Term
| duty factor is determined by |
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Definition
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Term
| Duty Factor is changed by the sonographer in what way? |
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Definition
| by changing the imaging depth |
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Term
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Definition
pulse duration
duty factor (%) = ___________________ x 100
pulse repetition period |
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Term
When the sonographer changes the imaging depth what parameters are changed?
Hint there are Three of them |
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Definition
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Term
| The two components of the PRP are? |
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Definition
| Transmit time and receive time. |
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