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Physics 4.3A

Image Processor Parts Preprocessor, post-processor, scan converter, analog to digital converter
Image Processor Functions converts scan line data into images, processes the images before storing them into the image memory
Image Processor processes them as they come out of the memory, coverts from digital to analog form, sends them out to display
Preprocessing Image processing done before storing in memory. Edge enhancement Persistence Write zoom Pixel interpolation Three Dimensional Acquisition
Edge Enhancement sharpens boundaries to make them more detectable and measurements more precise
Persistence Reduces noise and smooths the image by frame averaging Higher levels are appropriate for slow moving structures
Pixel Interpolation Fills in missing pixels Assigns brightness based on average brightness of adjacent pixels
Three Dimensional Acquisition Acquiring several two dimensional scans for three dimensional volume of information in the image memory
Write Magnification Smaller anatomic fields of view written into memory, Image can be enlarged without enlarging pixel size
Scan Converters to store and create each frame of information Analog Digital
Analog used vacuum tubes with a wire element
Analog Scan Converters advatages: continuous disadvantages: burned out, must warm up, drifted
Digital Scan Converters used in todays equipment, uses a computer
Digital means... "finger" or "toe", no drift, stable, lasts a long time, they are discrete
ADC review All components of the equipment use analog signal processing EXCEPT the memory Information stored in the memory MUST be in a digital signal
The ADC is located, Between the receiver and the memory converts the analog signal to a digital signal
The ADC is located between the receiver and the memory
Image frames are stored in the memory
post processing occurs after images are stored in memory
Information from the memory goes on to the display for everyone to see
Created by: Sierd98765