Chapter 13 - Real Time Imaging Flashcards
____ scanning is when images are displayed one frame at a time (like a photograph)
Static
____ imaging is when each frame is created and displayed very quickly, providing the impression os constant motion (like a movie)
Real time
____ ____ is the number of frames (images) produces in one second.
Frame rate
Frame rate is determined by what two things?
Sound’s speed in a medium and depth of imaging
What is the unit for frame rate?
Hertz or per second
____ ____ is the ability to accurately determine the position of an anatomic structure at a particular instant in time.
Temporal resolution
Temporal resolution is determined by what?
Frame rate
A high frame rate ____ temporal resolution.
Improves
A low frame rate ____ temporal resolution.
Degrates
____ is the time it takes the system to create one frame.
T-frame
Frame rate and T-frame are ___ related and ____.
Inversely; reciprocals
Imaging depth and frame rate are ____ related.
Inversely
Pulses per frame and frames rate are ____ related.
Inversely
What are the factors that affect the number of pulses creating an image?
- Number of pulses
- Sector size
- Line density
Multi-focusing ____ frame rate and ____ temporal resoultion.
Decreases; diminishes
High line density improves ____ resolution.
Spatial
Multi focus improves ____ resolution.
Lateral
Increasing the sector size leads to a ____ temporal resolution.
Decreased
Reducing the sector size leads to ____ temporal resolution.
Increased
What is the spacing between sound beams?
Line density
Line density and frame rate are ____ related.
Inversely
If the image depth is increased, how is temporal resolution affected?
It decreases
What type of imaging is A mode primarily used for?
Opthamology
If line density is increased, what happens to frame rate and spatial resolution?
Frame rate decreases; spatial resolution increases
What is the main factor in determining frame rate?
Imaging depth
What was the first form of grayscale imaging?
B-mode
