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[Introduction] [History] [Principles of Ultrasound] [Biomedical Significance] [Technical Description] [Instrument Observation] [Artifacts] [Interviews] [Future Direction] [Project Conclusion] Beam Former The first stage of the instrument is the beam former.
Technical Description of Color Doppler Ultrasound - BIOE 414 Instrumentation Projects - University of Illinois - Engineering Wiki
Basic ultrasound, echocardiography and Doppler ultrasound
The Doppler effect was discovered by Christian Andreas Doppler (1803 - 1853), and shows how the frequency of an emitted wave changes with the velocity of the emitter or observer. The theory was presented in the royal Bohemian society of Science in 25th of May1842 (5 listeners at the occasion!), and published in 1843 ( 119 ). The premises for his theoretical work was faulty, as he built his theory on the work of James Bradley who erroneously attributed the apparent motion of stars against the background (parallax effect) to the velocity of the earth in its orbit (instead of the effect of Earth's position in orbit on the angle of observation). Further, Doppler attributed the differences in colour of different stars to be due to the Doppler effect, assuming all stars to be white. Finally, he theoretised over the effect of the motion of double stars that rotate around each other, assuming a Doppler effect from the motion.
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Community College Ultrasonic Testing
Abstract: This application note is an introduction to ultrasound imaging systems. It discusses the trend towards smaller, lower cost, and more portable imaging solutions, while explaining what is required to maintain the performance and diagnostic capabilities found in larger cart-based systems. The system subfunctions and electrical components for an ultrasound system are outlined.
Overview of Ultrasound Imaging Systems and the Electrical Components Required for Main Subfunctions - Maxim
Ultrasound Production and Interactions
Ultrasound Pulse Amplitude, Intensity, and Energy . The pressure is related to the degree of tissue displacement caused by the vibration. The amplitude is related to the energy content, or "loudness," of the ultrasound pulse. The amplitude of the pulse as it leaves the transducer is generally determined by how hard the crystal is "struck" by the electrical pulse.