Sononerds Unit 4: Five Parameters of Pulsed Sound

5 parameters that describe pulsed sound

pulse duration, spatial pulse length, pulse repetition period, pulse repetition frequency, duty factor

continous

_______ waves CANNOT produce images

pulsed

to make an image, the sound wave must be __________

transmit time

when sound is on

receive time

when sound is off and the machine is listening

cycles

a pulse is made up of multiple _________

travel together

the cycles that make up a pulse work together and ___________ ___________

time

pulse duration is the _____________ it takes to complete one pulse

microseconds (us)

PD is expressed in units of ______

machine, cannot

PD is determined by ________ and ______ be adjusted by sonographer

directly; increases

PD and period are ___________ related.

if period gets longer, then PD _____________.

inversely, decreases

PD and frequency are __________ related.

if frequency goes higher, the PD _____________.

directly, increases

PD and the number of cycles are _____________ related.

if there are more cycles in a pulse, then PD _____________.

distance

SPL is the _____________ one pulse takes up in space

mm

SPL expressed in units of

machine, medium, cannot

SPL is determined by the _________________ and ________________ and _____________ be adjusted by the sonographer

directly, increases

SPL and wavelength are ___________ related.

if the wavelength gets longer, then SPL ___________

inversely, decreases

SPL and frequency are __________ related.

if frequency goes higher, then SPL _______________.

directly, increases

SPL and the number of cycles are ___________ related.

if there are more cycles in a pulse, then SPL ____________.

time

PRP is the ______________ from the start of one pulse to the start of the next pulse

microseconds

PRP expressed in units of

machine, can

PRP is determined by the ______________ and _________ be adjusted by the sonographer.

pulses

PRF is the number of _________ that the machine can send per second

kHz

PRF expressed in units of

machine, can

PRF is determined by the ____________ and _________ be adjusted by the sonographer

depth

PRP and PRF change when the imaging ___________ is adjusted

increases

more listening time __________ PRP

decreases

more listening time ___________ PRF

reciprocals

PRP and PRF are

inversely, decreases

PRP and PRF are __________ related.

if the PRF goes higher, then PRP ___________.

directly, increases

PRP and depth are ____________ related.

if the max imaging depth gets deeper, than the PRP ________________.

inversely, decreases

PRP and PRF are _________ related.

if the PRP gets longer, than PRF ________________.

inversely, decreases

PRF and depth are _____________ related.

if the max imaging depth gets deeper, than the PRF _______________.

percentage

DF is the _____________ of time that the pulse is on

machine, can

DF is determined by the ___________ and _______ be adjusted by the sonographer

depth

DF changes when the imaging ______________ is adjusted

directly, increases

DF and PD are ___________ related.

if PD gets longer, then DF _____________.

inversely, decreases

DF and PRP are ___________ related.

if PRP gets longer, then DF ____________.

directly, increases

DF and PRF are ___________ related.

if PRF increases, then DF __________.

PRP

parameter that is the time from the start of one pulse to the start of the next

PRP

parameter that increases when depth is increased

PD, SPL

parameters that cannot be adjusted by the sonographer

PD

parameter that is the time of start to end of a pulse

SPL

parameter that will decrease when the wavelength decreases

DF

Parameter that describes the percentage of on time

PRF, DF

parameters that decrease when depth in increased

SPL

parameter that describes the distance one pulse takes up in space

PD, SPL

parameters that will increase if a pulse has more cycles

PRP, PRF, DF

parameters that can be adjusted by the sonographer

DF

parameter that is the number of pulses that can be sent per second

PRP, PRF

parameters that are reciprocals of one another

PD, SPL

parameters that will increase if the frequency decreases

PRF, DF

parameters that will increase if PRP decreases

PD

parameter that will increase if period increases