![]() ![]() The wavefronts are spherical, but they combine (superpose) to form plane waves, creating a beam of sound traveling in a specific direction. The moving red lines are the wavefronts of the ultrasonic waves from each transducer. The timing of the pulses emitted by each transducer is controlled by programmable delay units (φ) that are controlled by a microprocessor control system (C). It consists of a beamforming oscillator (TX) that produces an electronic signal consisting of pulses of sine waves oscillating at an ultrasonic frequency, which is applied to an array of ultrasonic transducers (T) in contact with the skin surface that convert the electric signal into ultrasonic waves traveling through the tissue. Animation showing the principle of an ultrasonic scanner used in medical ultrasonic imaging.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |