RIU 324 Lecture Notes - Lecture 49: Sonographer, Decibel, Grayscale
23 Apr 2020
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Document Summary
These two tgc profiles represent the difference that occurs using a lower (figure 53) vs. higher (figure 54) frequency transducer. The assumption must be that the imaging is taking place on the same patient, and imaging to the same depth. Since higher frequency attenuates faster, the tgc profile is steeper. No external reference (i. e. registration armp) needed to determine position since beam is directed with a pattern. Scan converter (digital) assembles echo signals from each scan line and deciphers information during readout into 2d format for display. Preprocessing: takes place before scan conversion and cannot be changed on data that has been stored in the internal system ( cine ) memory (for conventional imaging systems). Post processing: takes place after scan conversion and can be changed after the data has been stored in the internal system ( cine ) memory. Analog is real-world information and digital uses binary numbers and gets rid of some information.
