Yes they do - in the form of high-pitched 'clicks'. Each "click" is a very short pulse or chirp of ultrasound. (A pure 'click' is merely a transient.)
why we donot have short time traning for ultrasound technician?
Yes they will still have a pulse for a short period of time.
The wavelength of a 3 MHz ultrasound pulse in soft tissue would be approximately 0.5 mm. Wavelength is given by the equation λ = c/f, where c is the speed of sound in tissue (~1500 m/s) and f is the frequency in Hz. This short wavelength allows for detailed imaging in soft tissue.
A bioplasma is a short laser pulse of biological origin.
The U is a short U (uh) despite the silent E.
Pulse can refer to both mechanical and electromagnetic phenomena. In a mechanical sense, a pulse is a wave of pressure or vibration traveling through a medium. In an electromagnetic sense, a pulse is a transient signal or wave of electromagnetic energy.
== == In diagnostic ultrasound axial resolution is influenced by a number of factors including transmission pulse length and frequency of the probe. For best axial resolution short pulses are used - long pulses can potentially improve the signal to noise ratio but their use often results in "range side lobes", effectively a reduction in axial resolution. Pulse repetition frequency (PRF) is a separate issue to axial resolution however high frequency probes are able to have a higher PRF (resulting in higher frame rates) than low frequency probes due to the higher rate of absorption of the higher frequency signals.
A short length of wave that travels is known as a wavelength. It is the distance between two consecutive points in a wave that are in phase with each other, such as from peak to peak or trough to trough. Wavelength is commonly used to measure the size of electromagnetic radiation or sound waves.
High dose, short duration corticosteroid therapy.
sferic (plural sferics) # A short pulse of electromagnetic radiation produced by lightning
The definition of Ultrasound is very short wavelengths of sound used in a similar way to x-rays. The reason that ultrasound is used is the fact that sound does can be used for getting moving pictures of internal bits of the body that x-rays can show as accurately