RIU 320 Lecture Notes - Lecture 62: Medical Ultrasound, Pulse Repetition Frequency, Lead Zirconate Titanate
17 Jun 2020
School
Department
Course
Professor
Document Summary
Continuous wave transducers, while performing cwd with a conventional imaging array, dedicated continuous wave transducers are relatively simple because it does not create anatomic images. The transducer contains only two elements, each shaped like a semicircle. One crystal continuously transmits sound while the other receives. Since dedicated continuous wave probes do not create images of anatomy, short duration pulses are unnecessary. probe, a select group of elements (and the associated electronics) is used for doppler. Half of the group is excited by continuous electrical signals and transmits a continuous sound beam, while the other half of the group receives the reflected sound. The matching layers increase the efficiency of sound transmitted in and out of the body, which is advantageous in both dedicated continuous wave and duplex doppler settings. transducers have increased sensitivity. They detect low amplitude reflections and small doppler shifts: note: most importantly, dedicated continuous wave. Pulsed wave doppler: only one pzt crystal is necessary.
