RIU 324 Lecture Notes - Lecture 48: Signal Processing, Edge Enhancement, Digital Image Processing
23 Apr 2020
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Document Summary
Pre processing - before storage in scan converter- cannot be reversed. Post processing- after storage in scan converter- can be reversed. The distinction of pre and post processing is being blurred. Now, instantaneous frames are stored, and all types of processing functions can be performed in live scanning mode. Retroactive application of traditionally pre-processing techniques, such as receiver gain, tgc, compression, and magnification. Signal processing is the manipulation of rf signals before. Scan data is analog format until after tgc reduces dynamic input to scan converter range of signals. Digitalization and dynamic focusing in receive beamformer. Additional signal processing controlled by operator (edge enhancement, compression, reject) before scan conversion. Once data is in matrix form it is called image processing. Image updating = beam is continually scanning the patient so new data is always available. Write zoom = mag applied during data collection= better spatial resolution.
