RIU 320 Lecture Notes - Lecture 42: Bicycle Wheel, Beam Steering, Windscreen Wiper

• School: GVSU
• Department: Radiation and Imaging - Ultrasound
• Course: RIU 320
• Professor: Angela Malone

Document Summary

A: how does an ultrasound system create high quality, two dimensional images, two characteristics of sound make two dimensional images challenging to make . The system automatically directs a second sound beam into the body at a slightly different direction than the first. The data are processed: then, the system automatically directs a third pulse into the body at another slightly different direction. Process is repeated numerous times, creating a 2d image. Mechanical transducer: contains a single, circular, disc-shaped active element that is physically moved. This movement creates a scan plane: crystals: number and shape, only have one active element. 3: beam steering, beam focusing, built up by rotating the crystal with a motor . Sound beams are emitted as the crystal moves. Scan plane is created through mechanical steering: have a fixed focal depth. This is called conventional, mechanical, or fixed focusing. Two methods of fixed focusing are: internal focusing: with the use of a curved active element or.