Ch 4 Spatial Compounding + Panoramas Flashcards
Panoramic imaging is an example of what imaging technique?
Preprocessing
Does panoramic imaging produce an image that has a wider or narrower FOV than what is available on an individual frame from a transducer?
Wider FOV
Panoramic imaging involves sliding the transducer in a direction parallel or perpendicular to the scan plane?
Parallel
In panoramic imaging, is old echo information from previous frames retained or thrown away?
Retained
In panoramic imaging, what happens to the new echoes?
They get added to the image in the direction in which the scan plane is moving
During the addition of new echoes in panoramic imaging, it is important to properly locate the new echoes relative to what?
Relative to the previously received echoes
In panoramic imaging, how can we properly locate the new echoes?
By correlating the locations of echoes common to the adjacent frames (the overlap), so that the new information on the new frame is located properly
Spatial compounding is an example of what imaging technique?
Preprocessing
What is spatial compounding?
A technique where scan lines are directed in multiple directions by phasing, so structures are interrogated more than once by the u/s beam
As many as how many frames are averaged to form a final frame in spatial compounding?
As many as 9 frames
Spatial compounding allows us to visualize what structures better?
Structures behind highly attenuating objects better
Scan lines are directed in multiple directions by what in spatial compounding?
By phasing
What is the purpose of spatial compounding?
So structures are interrogated more than once by the u/s beam
What is the spatial compounding button called on our u/s machines called?
Cross beam (also called SRI)
What happens to our image as we turn spatial compounding up/down?
Higher: smoother image
Lower: more grainy
