Relations

Flashcard #1
Term: What is the relationship between imaging depth and PRP?
Definition: Increasing imaging depth will increase PRP.

Flashcard #2
Term: What is the relationship between imaging depth and PRF?
Definition: Increasing imaging depth will decrease PRF.

Flashcard #3
Term: How does Pulse Duration (PD) affect Duty Factor (DF)?
Definition: Longer Pulse Duration (PD) increases Duty Factor.

Flashcard #4
Term: How does Pulse Repetition Period (PRP) affect Duty Factor (DF)?
Definition: Shorter Pulse Repetition Period (PRP) increases Duty Factor.

Flashcard #5
Term: What is the relationship between Spatial Pulse Length (SPL) and range resolution?
Definition: Longer Spatial Pulse Length (SPL) leads to worse range resolution.

Flashcard #6
Term: # How does transmit frequency relate to wavelength?
Definition: Higher Transmit Frequency results in Shorter Wavelength.

Flashcard #7
Term: How does wavelength affect Spatial Pulse Length (SPL)?
Definition: Shorter Wavelength creates Shorter SPL.

Flashcard #8
Term: How does SPL affect axial resolution?
Definition: Shorter SPL creates improved axial resolution: We see more detail on the image.

Flashcard #9
Term: What is the relationship between velocity and compressibility?
Definition: Velocity is inversely related to compressibility.

Flashcard #10
Term: What is the relationship between velocity and density?
Definition: Velocity is inversely related to density.

Flashcard #11
Term: What is the relationship between density and speed of sound?
Definition: Density is inversely related to speed of sound.

Flashcard #12
Term: What is the relationship between intensity and area?
Definition: Intensity is inversely related to area.

Flashcard #13
Term: What is the relationship between wavelength and frequency?
Definition: Wavelength is inversely related to frequency.

Flashcard #14
Term: What is the relationship between speed of sound and bulk modulus?
Definition: Speed of sound is proportional to bulk modulus.

Flashcard #15
Term: What is the relationship between intensity and square amplitude?
Definition: Intensity is proportional to square amplitude.

Flashcard #16
Term: What is the relationship between stiffness and speed of sound?
Definition: Stiffness is proportional to speed of sound.

Flashcard #17
Term: What is the relationship between echo strength and echo return time?
Definition: Echo strength is proportional to echo return time.

Flashcard #18
Term: How do scanned modalities affect temporal resolution?
Definition: The temporal resolution is dramatically degraded with scanned modalities.

Flashcard #19
Term: How does Color Doppler affect frame time and temporal resolution?
Definition: Color Doppler images generally have significantly greater frame time, thus degrading the temporal resolution.

Flashcard #20
Term: What is the relationship between signal duration and bandwidth?
Definition: 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.

Flashcard #21
Term: How does the number of cycles in a pulse affect axial resolution?
Definition: Having more cycles in a pulse results in a longer SPL and degraded axial resolution.

Flashcard #22
Term: How does a 'backing' or 'damping' layer affect axial resolution?
Definition: By adding a 'backing' or 'damping' layer to the transducer crystal, the ringdown is decreased, thus improving the axial resolution.

Flashcard #23
Term: What is the relationship between Q-factor and Fractional Bandwidth?
Definition: Quality Factor is the reciprocal of Fractional Bandwidth.

Flashcard #24
Term: What is the relationship between pulse length (shorter pulses) and Q-factor?
Definition: Shorter pulses have lower Q-factor.

Flashcard #25
Term: What does a high Q-factor transducer indicate?
Definition: A high Q-factor transducer indicates a narrow bandwidth and a long SPL.

Flashcard #26
Term: What does a low Q-factor transducer indicate?
Definition: A low Q-factor transducer indicates a broad bandwidth and a short SPL.

Flashcard #27
Term: How does frame time relate to imaging depth and number of lines?
Definition: Frame time is clearly affected by the imaging depth and the number of lines in the frame.

Flashcard #28
Term: How is frame rate related to frame time?
Definition: The frame rate is just the reciprocal of the frame time.

Flashcard #29
Term: What is the relationship between pulse length (shorter pulse/fewer cycles) and the number of frequencies it contains?
Definition: The shorter the pulse (the fewer the number of cycles) the higher the number of frequencies it contains (broader bandwidth).

Flashcard #30
Term: Which modalities have a greater risk of thermal biological effects?
Definition: # The risk of thermal biological effects is usually much greater with non-scanned modalities.