# Study sets matching "ultrasound physics"

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What does a shorter wavelength equate t…

What is the range where ultrasound wave…

What is a period?

What is a wavelength?

A higher frequency.

From 6 to 13 megaHz

It is the time it takes for one wavelength to pass.

It is a measurement from one point to one point (Lambda)

What does a shorter wavelength equate t…

A higher frequency.

What is the range where ultrasound wave…

From 6 to 13 megaHz

continuous wave ultrasound (can/cannot)…

What are the 5 parameters that are need…

Sound pulses have an "on" time and an "…

In diagnostic imaging we use (long/shor…

cannot

pulse duration... pulse repetition period... pulse repetition freque…

true

short

continuous wave ultrasound (can/cannot)…

cannot

What are the 5 parameters that are need…

pulse duration... pulse repetition period... pulse repetition freque…

What is sound?

How does sound travel?

What does sound require?

For ultrasound what is our medium?

Sound is mechanical energy that is transmitted by pressure wav…

Sound travels due to pressure waves on the medium

Sound requires a deformable medium due to need for particles t…

The patient's particle bioeffects .

What is sound?

Sound is mechanical energy that is transmitted by pressure wav…

How does sound travel?

Sound travels due to pressure waves on the medium

pressure, density, particle motion

mechanical, longitudinal

Mechanical Force

Energy

The following variables can be used to described every sound w…

Sound is a _____, ______ wave

A pressure wave is a ____ ____

Sound waves carry _____ from one place to another

pressure, density, particle motion

The following variables can be used to described every sound w…

mechanical, longitudinal

Sound is a _____, ______ wave

In diagnostic ultrasound continuous wav…

Imaging systems produce short

A pulse must have

Although a pulse is made up of individu…

create anatomic images

bursts or pulses of acoustic energy to create every picture of…

a beginning and an end

moves as a single unit

In diagnostic ultrasound continuous wav…

create anatomic images

Imaging systems produce short

bursts or pulses of acoustic energy to create every picture of…

Frequency

Wavelength

equation for speed

Wavelength changes based on media

number of times a wave oscillates through a cycle each second…

distance between areas of compression

Speed= wavelength X frequency

Frequency does NOT

Frequency

number of times a wave oscillates through a cycle each second…

Wavelength

distance between areas of compression

Frequency

Wavelength

Speed

Speeds effect on frequency

the rate of change betweeen compression and rarefaction, given…

distance between areas of comporession

constant in a particular medium. ... increas in frequnecy decrea…

none. The frequency is the same, irrelevant of the speed of so…

Frequency

the rate of change betweeen compression and rarefaction, given…

Wavelength

distance between areas of comporession

Resolution

As depth of view increases,

As depth of view decreases,

With deeper imaging, the listening time…

Equals accuracy; the ability to create accurate images, which…

pulse repetition period increases.

pulse repetition period decreases.

lengthen.

Resolution

Equals accuracy; the ability to create accurate images, which…

As depth of view increases,

pulse repetition period increases.

Intensity Equation

What is Intensity

Variations of intensity occur?

Ultrasound beam have variations of inte…

Power(watts) / beam area (cm^2)

the concentration of the power in a beam

In time and space

Where in the beam you are making a measurement, When the syste…

Intensity Equation

Power(watts) / beam area (cm^2)

What is Intensity

the concentration of the power in a beam

Brightness and Strength

96-256 scan lines

Mechanical Wave

Electromagnetic Wave

The [blank] of each dot on the screen corresponds to the echo'…

There are approximately [blank] to [blank] scan lines that mak…

Type of wave which can only propagate through a media such as…

Type of wave which can only propagate through a media or a vac…

Brightness and Strength

The [blank] of each dot on the screen corresponds to the echo'…

96-256 scan lines

There are approximately [blank] to [blank] scan lines that mak…

The ______________ of a sound wave is t…

The tissue by which sound is traveling…

Period

The typical value of a Period in diagno…

source

medium

is the time necessary to create a single cycle, or the time fr…

0.06 to 0.5 microseconds.

The ______________ of a sound wave is t…

source

The tissue by which sound is traveling…

medium

What is the attenuation coefficient in…

Decibel Notation

Logarithm

Decibels are a Ratio, what is needed to…

0.5 dB/cm/ MHz

A standard measurement tool used to report RELATIVE changes in…

Mathematical construct for rating numbers:... -The LOG represent…

RATIO =... (Actual level / Starting level)... This means that TWO i…

What is the attenuation coefficient in…

0.5 dB/cm/ MHz

Decibel Notation

A standard measurement tool used to report RELATIVE changes in…

What do waves transfer from one locatio…

sound source

time

amplitude

Waves carry energy from place to place.

is the ultrasound system and the transducer

is represent horizontally on the x-axis

is represented vertically on the y-axis

What do waves transfer from one locatio…

Waves carry energy from place to place.

sound source

is the ultrasound system and the transducer

Sound

Ultrasound

Piezoelectric effect

Appearance of a strong echo

energy (pressure waves) that propagate through a medium

sound with a frequency above human hearing (>20 kHz)

-Natural property of a crystal or other material to deform und…

Bright white dot

Sound

energy (pressure waves) that propagate through a medium

Ultrasound

sound with a frequency above human hearing (>20 kHz)

X - axis

Y - axis

unrelated

directly proportional (or directly rela…

horizontal axis that runs side to side

vertical axis that runs up and down

two items that are not associated or don't have anything to do…

two items that are associated such that when one item increase…

X - axis

horizontal axis that runs side to side

Y - axis

vertical axis that runs up and down

What is the attenuation coefficient in…

Decibel Notation

Logarithm

Decibels are a Ratio, what is needed to…

0.5 dB/cm/ MHz

A standard measurement tool used to report RELATIVE changes in…

Mathematical construct for rating numbers:... -The LOG represent…

RATIO =... (Actual level / Starting level)... This means that TWO i…

What is the attenuation coefficient in…

0.5 dB/cm/ MHz

Decibel Notation

A standard measurement tool used to report RELATIVE changes in…

What is the attenuation coefficient in…

Decibel Notation

Logarithm

Decibels are a Ratio, what is needed to…

0.5 dB/cm/ MHz

A standard measurement tool used to report RELATIVE changes in…

Mathematical construct for rating numbers:... -The LOG represent…

RATIO =... (Actual level / Starting level)... This means that TWO i…

What is the attenuation coefficient in…

0.5 dB/cm/ MHz

Decibel Notation

A standard measurement tool used to report RELATIVE changes in…