RIU 320 Lecture Notes - Lecture 48: Lead Zirconate Titanate, Sonographer, Demodulation
17 May 2020
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Document Summary
Receiver, small sound pulses reflect off a boundary within the body, return to the transducer, and strike the pzt crystals, generating tiny electrical signals. In this process, each electronic signal returning from the transducer is made larger. Each signal undergoes an equal amount of amplification: required because the electrical signals are too low to be displayed on the monitor, effect on image, all electrical signals in the receiver are affected identically by amplification. The entire image is made brighter or darker when the sonographer adjusts that receiver gain b: amplifies cannot distinguish between reflections that provide meaningful diagnostic information (signal) from the accompanying noise that degrades image quality. What is its role in processing signals from the transducer during reception: preamplification is the process of improving the quality of a signal before it is amplified. Without compensation, every us image would become progressively darker with increasing depth.
