Lecture 6 P2 Flashcards
Describe spatial compounding in pre-processing
Hit the same object from different angle and average the images —> trying to average out to hit the structure at 90 degrees
What are the benefits of spatial compounding
Clear out cysts
Sharpen borders
What is fusion imaging in the pre-processing
Averaging out the frames created using all the different frequencies
Describe persistence is pre-posting
Averaging of sequential frames in time
Aka frame averaging
Advantages to persistence
Reduces noise (speckle) and random content
Is persistence automatic?
No operator controlled
What happens to frame rate with use of persistence
Decrease in frame rate
3D imaging in Preprocessing
Multiple parallel 2D frames obtained and built into 3D volume
Aka volume imaging/ volumetric imaging
Why is fusion imaging beneficial
Use high freq for near field resolution and low freq far larger depths
4D imaging=
3D imaging + time
What is elastography in pre-processing
Elastography is an imaging method that presents qualitative tissue stiffness information on the anatomic display and, in some cases, presents quantitative stiffness info
Compressibility in elastography has a correlation with
Malignancy potential
How is elastography viewed
Split screen is used
Colour side display shows compressibility
Summary of pre processing
All processing functinos involved before frames are placed in memory
They are all live scanning options
Pre-processing functions cannot be done after pressing freeze
Can post processing be done on froze nimage
Yes
What is post processing
Involves processing done to an image after it is pulled from the image memory
Is black-echo/ white echo part of post processing
Yes
2 more post processing functions
B- colour and cutting up 3D image
Human eye can see ____ shades of grey and ______ shade of colour
100
256
Read magnification funciton of post processing
Pulls out specific pixels from the frame from memory nad displays them using the entire display
Read magnification aka
Read zoom
Drawback of read magnification
Pixelization —> enlargement of pixels
PRE PROCESSING write magnification
Smaller field of view written using the pixels for the entire frame
Better resolution
Changing depth is a similar function
Write magnification aka
Write zoom
