# Study sets matching "physics chapter 9 understanding ultrasound"

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Adjustable focus systems are called wha…

Increasing the diameter of the transduc…

A deeper focus will result in transduce…

What is the relationship between crysta…

phased array

deeper focus

higher frequency

inversely related

Adjustable focus systems are called wha…

phased array

Increasing the diameter of the transduc…

deeper focus

What location within the beam is the di…

What is the region from the transducer…

What is the distance from the transduce…

The region starting at the focal point…

focal point

near zone (fresnel zone)

focal depth (near zone length)

far zone (fraunhofer zone)

What location within the beam is the di…

focal point

What is the region from the transducer…

near zone (fresnel zone)

Adjustable focus systems are called wha…

Increasing the diameter of the transduc…

A deeper focus will result in transduce…

What is the relationship between crysta…

phased array

deeper focus

higher frequency

inversely related

Adjustable focus systems are called wha…

phased array

Increasing the diameter of the transduc…

deeper focus

What location within the beam is the di…

What is the region from the transducer…

What is the distance from the transduce…

The region starting at the focal point…

focal point

near zone (fresnel zone)

focal depth (near zone length)

far zone (fraunhofer zone)

What location within the beam is the di…

focal point

What is the region from the transducer…

near zone (fresnel zone)

Synonym for PIEZOELECTRIC ------>

Piezoelectric materials found in NATURE

Components of a Basic Transducer (7)

1. Case

FERROELECTRIC

1. quartz... 2. tourmaline

1. Case... 2. Electrical Shield... 3. Acoustic Insulator... 4. Wire... 5.…

- CYLINDRICAL tube that encases the transducer... - PROTECTS the…

Synonym for PIEZOELECTRIC ------>

FERROELECTRIC

Piezoelectric materials found in NATURE

1. quartz... 2. tourmaline

What location within the beam is the di…

What is the region from the transducer…

What is the distance from the transduce…

The region starting at the focal point…

focal point

near zone (fresnel zone)

focal depth (near zone length)

far zone (fraunhofer zone)

What location within the beam is the di…

focal point

What is the region from the transducer…

near zone (fresnel zone)

What location within the beam is the di…

What is the region from the transducer…

What is the distance from the transduce…

The region starting at the focal point…

focal point

near zone (fresnel zone)

focal depth (near zone length)

far zone (fraunhofer zone)

What location within the beam is the di…

focal point

What is the region from the transducer…

near zone (fresnel zone)

Acoustic parameters

VOLUME

PRESSURE

DENSITY

period, frequency, wavelength, propagation speed, amplitude, p…

the space occupied by a material or object.

concentration of force in 1 unit or area.

concentration of mass in a unit of volume.

Acoustic parameters

period, frequency, wavelength, propagation speed, amplitude, p…

VOLUME

the space occupied by a material or object.

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…

Transmission

Reception

Piezoelectric Effect

Reverse Piezoelectric Effect

Electrical energy from the system is converted into sound

The reflected sound pulse is converted into electricity

The property of certain materials to create a voltage when the…

Piezoelectric materials change shape when a voltage is applied…

Transmission

Electrical energy from the system is converted into sound

Reception

The reflected sound pulse is converted into electricity

Acoustic parameters

VOLUME

PRESSURE

DENSITY

period, frequency, wavelength, propagation speed, amplitude, p…

the space occupied by a material or object.

concentration of force in 1 unit or area.

concentration of mass in a unit of volume.

Acoustic parameters

period, frequency, wavelength, propagation speed, amplitude, p…

VOLUME

the space occupied by a material or object.

resolution

axial resolution

units of axial resolution

related to spatial pulse length and pul…

the ability to create accurate images; the essence of diagnost…

measures the ability of a system to display two structures tha…

mm or units of distance

axial resolution

resolution

the ability to create accurate images; the essence of diagnost…

axial resolution

measures the ability of a system to display two structures tha…

Transducer

Transducer: during TRANSMISSION

Transducer: during RECEPTION

How do get from ELECTRICAL energy to AC…

Any device that CONVERTS from one form of ENERGY into ANOTHER

Converts ELECTRICAL energy from the system into ACOUSTIC energ…

Converts the REFLECTED sound pulse into ELECTRICITY

The PIEZOELECTRIC EFFECT

Transducer

Any device that CONVERTS from one form of ENERGY into ANOTHER

Transducer: during TRANSMISSION

Converts ELECTRICAL energy from the system into ACOUSTIC energ…

Transducer

Transducer: during TRANSMISSION

Transducer: during RECEPTION

How do get from ELECTRICAL energy to AC…

Any device that CONVERTS from one form of ENERGY into ANOTHER

Converts ELECTRICAL energy from the system into ACOUSTIC energ…

Converts the REFLECTED sound pulse into ELECTRICITY

The PIEZOELECTRIC EFFECT

Transducer

Any device that CONVERTS from one form of ENERGY into ANOTHER

Transducer: during TRANSMISSION

Converts ELECTRICAL energy from the system into ACOUSTIC energ…

Volume, Pressure, Density, Distance

period, frequency, amplitude, power, in…

RAREFIED

STRAIGHT LINE

What are the FOUR acoustic variables?

What are the seven acoustic parameters

stretched apart

Sound travels in a_______?

Volume, Pressure, Density, Distance

What are the FOUR acoustic variables?

period, frequency, amplitude, power, in…

What are the seven acoustic parameters

Two items that are not associated.

Two items that are associated or affili…

Two items that are associated such that…

Two items are associated such that when…

Unrelated

Related, or proportional

Directly related, or directly proportional

Inversely related, or inversely proportional

Two items that are not associated.

Unrelated

Two items that are associated or affili…

Related, or proportional

What are the seven parameters that are…

What is period?

Units of period?

What is period determined by?

period. frequency .amplitude. power .intensity .wavelength. sp…

the time it takes to complete a cycle

unit of time

source

What are the seven parameters that are…

period. frequency .amplitude. power .intensity .wavelength. sp…

What is period?

the time it takes to complete a cycle

Two items that are not associated.

Two items that are associated or affili…

Two items that are associated such that…

Two items are associated such that when…

Unrelated

Related, or proportional

Directly related, or directly proportional

Inversely related, or inversely proportional

Two items that are not associated.

Unrelated

Two items that are associated or affili…

Related, or proportional

Transducer diameter and focal depth are…

The beam from a larger diameter active…

___________________ frequency sound res…

Frequency and focal depth are _________…

Directly

Higher frequency

Higher

Directly

Transducer diameter and focal depth are…

Directly

The beam from a larger diameter active…

Higher frequency

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 are the 5 parameters that describe…

Can a continuous wave create an image?

Can a pulse wave create an image?

What is a pulse wave?

Pulse duration, PRP, PRF, duty factor and spatial pulse length

No

Yes

Collection of cycles that travel together

What are the 5 parameters that describe…

Pulse duration, PRP, PRF, duty factor and spatial pulse length

Can a continuous wave create an image?

No

What are the seven parameters that are…

What is period?

Units of period?

What is period determined by?

period. frequency .amplitude. power .intensity .wavelength. sp…

the time it takes to complete a cycle

unit of time

source

What are the seven parameters that are…

period. frequency .amplitude. power .intensity .wavelength. sp…

What is period?

the time it takes to complete a cycle

What are the 5 parameters that describe…

Can a continuous wave create an image?

Can a pulse wave create an image?

What is a pulse wave?

Pulse duration, PRP, PRF, duty factor and spatial pulse length

No

Yes

Collection of cycles that travel together

What are the 5 parameters that describe…

Pulse duration, PRP, PRF, duty factor and spatial pulse length

Can a continuous wave create an image?

No

Depth Equation

Pulse Repetition Period and Imaging Dep…

The 13-microsecond Rule

Pulse Repetition Frequency and Maximum…

Depth (mm) = 1.54mm/ms * go-return time/2

PRP = Imaging Depth * 13

Applied when sound travels through soft tissue

PRF = 77,000 cm/s/Imaging Depth (cm)

Depth Equation

Depth (mm) = 1.54mm/ms * go-return time/2

Pulse Repetition Period and Imaging Dep…

PRP = Imaging Depth * 13