ALARA, As Low As Reasonably Achievable, Color Doppler: Red, Flow moving forward or toward probe, Color Doppler: Blue, Flow moving backwards or away from probe, TGC, allows the sonographer to manually amplify the receiver gain gradually at specific depths, Gain, allows the sonographer to amplify or boost the echo signals, Focal zone, control allows the transducer to focus the transmitted sound at different depths, Field of view, control allows the sonographer to adjust the depth and width of the image, Doppler effect, the apparent change in frequency of sound or light waves emitted by a source as it moves away from or toward an observer, Attenuation, the sum of acoustic energy loss resulting from absorption, scattering, and reflection., Frequency, describes the number of oscillations per second performed by the particles of the medium in which the wave is propagating..

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