Real Time Imaging (Temporal Resolution) Flashcards
What is the definition of Frame Rate?
The system’s ability to create numerous frames each second (Hz); directly related to Temporal Resolution and the system’s PRE, inversely related to Tframe.
What does Temporal Resolution describe?
The ability to precisely position moving structures from instant to instant.
What is Tframe?
Time it takes the system to create 1 frame.
What factors affect Frame Rate?
- Speed of Sound in the Medium
- Sector size
- Short go-return time
- Line density
What is the relationship between Frame Rate and Temporal Resolution?
Higher frame rate leads to better Temporal Resolution.
What is the formula for PRF?
PRF = # scan lines x frame rate.
What results in Superior Temporal Resolution?
Higher frequency transducer and shorter Tframe.
What is the effect of Multi-Focus on Temporal Resolution?
Lower frame rate and diminished Temporal resolution.
Fill in the blank: In M-mode, the term for frame rate is _______.
very high and equal to the system’s PRE.
What is the impact of Imaging Depth on Frame Rate?
Deep Imaging results in longer Tframe and lower frame rate.
What is the advantage of Multi-Focus imaging?
Improved Lateral resolution.
True or False: A higher number of focal points results in a higher frame rate.
False.
What is the effect of a lower frequency transducer on Temporal Resolution?
Inferior Temporal Resolution.
Fill in the blank: The spacing between sound beams is referred to as _______.
line density.
Define Shallow Imaging in terms of Frame Rate.
Shorter Tframe and higher frame rate.
What happens to Temporal Resolution with poorer Lateral resolution?
Better Temporal resolution.
What is the relationship between the number of Pulses per frame and Frame Rate?
Inversely related to both.
What is a characteristic of a narrow sector in ultrasound imaging?
Fewer pulses per frame
This results in a higher frame rate and superior temporal resolution.
How does a narrow sector affect Tframe?
Shorter Tframe
This contributes to a higher frame rate.
What is the temporal resolution like in a narrow sector?
Superior temporal resolution
This is due to the higher frame rate.
What is the line density in a narrow sector?
Low line density
This means widely spaced lines.
What is the spatial resolution like in a narrow sector?
Poor spatial resolution
This is a trade-off for better temporal resolution.
What imaging characteristics does a narrow sector provide?
Shallower imaging (high frequency), single focus, narrow sector size
These factors contribute to its specific imaging capabilities.
What is a characteristic of a wide sector in ultrasound imaging?
More pulses per frame
This results in a lower frame rate and inferior temporal resolution.
How does a wide sector affect Tframe?
Longer Tframe
This contributes to the lower frame rate.
What is the temporal resolution like in a wide sector?
Inferior temporal resolution
This is due to the lower frame rate.
What is the line density in a wide sector?
High line density
This means tightly packed lines.
What is the spatial resolution like in a wide sector?
Excellent spatial (detail) resolution
This is the main advantage of a wide sector.
What is the temporal resolution like in a wide sector?
Worse temporal resolution
This is due to the lower frame rate.
What imaging characteristics does a wide sector provide?
Deeper imaging (low frequency), multiple foci, wide sector size
These factors improve lateral resolution.
