Understanding ultrasound physics pdf 2025

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The technique is based on principle of functioning sonar (Sonar Navigation and Ranging). A sound wave is typically produced by a piezoelectric transducer encased in a probe. Strong, short electrical pulses from the ultrasound machine make the transducer ring at the desired frequency.
Also known as sonography, ultrasound imaging uses a small transducer (probe) to both transmit sound waves into the body and record the waves that echo back. Sound waves travel into the area being examined until they hit a boundary between tissues, such as between fluid and soft tissue, or soft tissue and bone.
Definition of Ultrasound Sound travels as a mechanical longitudinal wave in which back-and-forth particle motion is parallel to the direction of wave travel. Ultrasound is high-frequency sound and refers to mechanical vibrations above 20 kHz. Human ears can hear sounds with frequencies between 20 Hz and 20 kHz.
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A trained technician (sonographer) presses a small, hand-held device (transducer) against the area being studied and moves it as needed to capture the images. The transducer sends sound waves into your body, collects the ones that bounce back and sends them to a computer, which creates the images.
Ultrasound waves are emitted from piezoelectric crystals of the ultrasound transducer. Depending on the acoustic impedance of different materials, which depends on their density, different grades of white and black images are produced.
In soft tissue, the ultrasound wavelength is 0.39 mm at 4 MHz and 0.15 mm at 10 MHz.
ing to this equation, the wavelength of a 5-MHz (5 000 000-Hz) ultrasound wave in a soft tissue, in which the ultrasound speed is about 1540 m/s, is: = 1540 m/s / 5 000 000 Hz = 0.000308 m = 308 m.
Ultrasound waves are produced by a transducer, which can both emit ultrasound waves, as well as detect the ultrasound echoes reflected back. In most cases, the active elements in ultrasound transducers are made of special ceramic crystal materials called piezoelectrics.

understanding ultrasound physics pdf