Relations

What is the relationship between imaging depth and PRP?

Increasing imaging depth will increase PRP.

What is the relationship between imaging depth and PRF?

Increasing imaging depth will decrease PRF.

How does Pulse Duration (PD) affect Duty Factor (DF)?

Longer Pulse Duration (PD) increases Duty Factor.

How does Pulse Repetition Period (PRP) affect Duty Factor (DF)?

Shorter Pulse Repetition Period (PRP) increases Duty Factor.

What is the relationship between Spatial Pulse Length (SPL) and range resolution?

Longer Spatial Pulse Length (SPL) leads to worse range resolution.

How does transmit frequency relate to wavelength?

Higher Transmit Frequency results in Shorter Wavelength.

How does wavelength affect Spatial Pulse Length (SPL)?

Shorter Wavelength creates Shorter SPL.

How does SPL affect axial resolution?

Shorter SPL creates improved axial resolution: We see more detail on the image.

What is the relationship between velocity and compressibility?

Velocity is inversely related to compressibility.

What is the relationship between velocity and density?

Velocity is inversely related to density.

What is the relationship between density and speed of sound?

Density is inversely related to speed of sound.

What is the relationship between intensity and area?

Intensity is inversely related to area.

What is the relationship between wavelength and frequency?

Wavelength is inversely related to frequency.

What is the relationship between speed of sound and bulk modulus?

Speed of sound is proportional to bulk modulus.

What is the relationship between intensity and square amplitude?

Intensity is proportional to square amplitude.

What is the relationship between stiffness and speed of sound?

Stiffness is proportional to speed of sound.

What is the relationship between echo strength and echo return time?

Echo strength is proportional to echo return time.

How do scanned modalities affect temporal resolution?

The temporal resolution is dramatically degraded with scanned modalities.

How does Color Doppler affect frame time and temporal resolution?

Color Doppler images generally have significantly greater frame time, thus degrading the temporal resolution.

What is the relationship between signal duration and bandwidth?

If the signal rings for a long time, there is a narrow bandwidth. If the signal rings for a short time, there is a broad bandwidth.

How does the number of cycles in a pulse affect axial resolution?

Having more cycles in a pulse results in a longer SPL and degraded axial resolution.

How does a 'backing' or 'damping' layer affect axial resolution?

By adding a 'backing' or 'damping' layer to the transducer crystal, the ringdown is decreased, thus improving the axial resolution.

What is the relationship between Q-factor and Fractional Bandwidth?

Quality Factor is the reciprocal of Fractional Bandwidth.

What is the relationship between pulse length (shorter pulses) and Q-factor?

Shorter pulses have lower Q-factor.

What does a high Q-factor transducer indicate?

A high Q-factor transducer indicates a narrow bandwidth and a long SPL.

What does a low Q-factor transducer indicate?

A low Q-factor transducer indicates a broad bandwidth and a short SPL.

How does frame time relate to imaging depth and number of lines?

Frame time is clearly affected by the imaging depth and the number of lines in the frame.

How is frame rate related to frame time?

The frame rate is just the reciprocal of the frame time.

What is the relationship between pulse length (shorter pulse/fewer cycles) and the number of frequencies it contains?

The shorter the pulse (the fewer the number of cycles) the higher the number of frequencies it contains (broader bandwidth).

Which modalities have a greater risk of thermal biological effects?

The risk of thermal biological effects is usually much greater with non-scanned modalities.