![]() ![]() Īn imaging technique refers to a method of signal generation and processing that results in a specific application. This has also been referred to as C-mode. Three-dimensional imaging is done by combining B-mode images, using dedicated rotating or stationary probes. As the actual speed of sound varies greatly in different tissue types, an ultrasound image is therefore not a true tomographic representation of the body. Most machines convert two-way time to imaging depth using as assumed speed of sound of 1540 m/s. As moving tissue transitions produce backscattering, this can be used to determine the displacement of specific organ structures, most commonly the heart. This mode is an ultrasound analogy to streak video recording in high-speed photography. The M-mode image dimensions are however voltage as a function of two-way time and recording time. Each next line is plotted adjacent to the previous, resulting in an image that looks like a B-mode image. The backscattered signal is converted to lines of bright pixels, whose brightness linearly correlates to backscattered voltage amplitudes.
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