Ultrasound Physics Exam 1 Chapters
1-5
Period - -The time it takes a wave to vibrate a single cycle ( the time from
the start of once cycle to the start of the next cycle)
P or T
Not adjustable by sonographer
measured in: any form of time
determined by: sound source (transducer
- Frequency - -A number of particular events that occur in a specific
duration of time. (presidential elections, in US the number of cycles that
occur in one second)
Symbol: f
Not adjustable by sonographer
Units: Hz or per second
Determined by: sound source
- Amplitude - -The "bigness" of a wave. Difference between the max value
and the average value of an acoustic variable. ALSO the difference between
the minimum val. and the average val. of the acoustic variable)
It is adjustable by sonographer
Units: Pascals and dB
Determined by: Sonographer/sound source
- Power - -The rate of energy transfer or the rate at which work is
performed. Describes the "bigness" of a wave.
It is adjustable by the sonographer
Units: Watts or mwatts
Determined by: sonographer/sound source
, - Intensity - -The concentration of energy in a sound beam. Describes the
"bigness" of a wave. Relates to how the power in a wave spreads or is
distributed in space. It depends both on power in the beam and the area
over which the power is applied.
It is adjustable by the sonographer
Units: dB
Determined by: sonographer/sound source
- Wavelegnth - -the distance or length of one complete cycle. Like a
train...wavelength is the length of a single boxcar in a train.
Symbol: λ
Formula: λ=c/f
Not adjustable by the sonographer
Units:any form of distance
Determined by: The source and the medius (the only parameter determined
by both)
- Propagation Speed - -The rate at which a sound wave travels through a
medium
Symbol: C
Formula: C=d/t
Not adjustable by the sonographer
Units: Distance/time
Determined by: The medium
- Pulse Duration - -The ACTUAL time from the start of a pulse to the end of
that pulse "on time"
Symbol: PD
Not adjustable by the sonographer
1-5
Period - -The time it takes a wave to vibrate a single cycle ( the time from
the start of once cycle to the start of the next cycle)
P or T
Not adjustable by sonographer
measured in: any form of time
determined by: sound source (transducer
- Frequency - -A number of particular events that occur in a specific
duration of time. (presidential elections, in US the number of cycles that
occur in one second)
Symbol: f
Not adjustable by sonographer
Units: Hz or per second
Determined by: sound source
- Amplitude - -The "bigness" of a wave. Difference between the max value
and the average value of an acoustic variable. ALSO the difference between
the minimum val. and the average val. of the acoustic variable)
It is adjustable by sonographer
Units: Pascals and dB
Determined by: Sonographer/sound source
- Power - -The rate of energy transfer or the rate at which work is
performed. Describes the "bigness" of a wave.
It is adjustable by the sonographer
Units: Watts or mwatts
Determined by: sonographer/sound source
, - Intensity - -The concentration of energy in a sound beam. Describes the
"bigness" of a wave. Relates to how the power in a wave spreads or is
distributed in space. It depends both on power in the beam and the area
over which the power is applied.
It is adjustable by the sonographer
Units: dB
Determined by: sonographer/sound source
- Wavelegnth - -the distance or length of one complete cycle. Like a
train...wavelength is the length of a single boxcar in a train.
Symbol: λ
Formula: λ=c/f
Not adjustable by the sonographer
Units:any form of distance
Determined by: The source and the medius (the only parameter determined
by both)
- Propagation Speed - -The rate at which a sound wave travels through a
medium
Symbol: C
Formula: C=d/t
Not adjustable by the sonographer
Units: Distance/time
Determined by: The medium
- Pulse Duration - -The ACTUAL time from the start of a pulse to the end of
that pulse "on time"
Symbol: PD
Not adjustable by the sonographer
