RIU 420 Lecture Notes - Lecture 1: Noise Floor, Lead Zirconate Titanate, Sonographer
3 Feb 2020
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Basic definitions for important system definitions listed on page 148. Dynamic range: ratio max to min amplitude. Noise floor: amplitude below which no signal is visible due to noise. Signal to noise ratio: (bigger=better) the amplitude of the signal divided by the amplitude of the noise. Compression : mapping larger dr into smaller dr. Pre processing: change occurs before signal storage; in real time and cannot be removed from an image once acquired. Post processing: change occurs after signal storage. Understand what happens when adjusting the transmit power. Be familiar with other terms with the same meaning (output power, power, transmitter output, output gain, acoustic power, pulsar power, energy output) e pg 218. Sonographer can adjust the magnitude of the pulser"s electrical voltage spoke which ranges from 0-100. Modify the brightness of the entire image. When low= pzt element vibrates gently and a weak sound beam is transmitted= weak reflected echo= dark image.
