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Portable ultrasound is a modality of medical ultrasonography that utilizes small and light devices, compared to the console-style ultrasound machines that preceded them. In most cases these mobile ultrasound systems could be carried by hand and in some cases even operated for a time on battery power alone.
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Some 56xx machines produced between 1994 and 1996 were badged as "AT&T" rather than "NCR", mirroring the company's brief ownership under the telecoms giant in the mid-1990s. 56xx models have included the 5670 (interior lobby cash dispense only), 5675 (interior lobby multifunction—dispense & deposit), 5684 (exterior TTW dispense only), 5688 ...
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Typical diagnostic ultrasound machines operate in the frequency range of 2-18 megahertz, whereas home ultrasound machines and therapeutic ultrasound machines operate in the frequency range of .7-3.3 megahertz. Diagnostic sonography is typically used to create an audio "image", such as during pregnancy to visualize the developing baby.
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The diagnostic machine displays these results in the form of a signal with an amplitude representing the intensity of the reflection and the distance, representing the arrival time of the reflection. In attenuation (or through-transmission) mode, a transmitter sends ultrasound through one surface, and a separate receiver detects the amount that ...