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14.2 Diagnostic Equipment
The intensity and motion of the beam are controlled by electrical signals.
The information content of the signal is displayed on the screen.
The range of audible frequencies can be translated into sound electrical signals.
The experimental signal can be very loud.
There are spurious signals due to various sources extraneous to the main phenomenon.
There are techniques that can be used to analyze the signals and get the information from the noise.
This processing is done by a computer in modern experiments.
The traditional stethoscope has electronic modifications that increase its sensitivity.
Potential differences are produced along the surface of the body as a result of the ionic currents associated with electrical activities in the cells.
It is possible to get information about the functioning of specific organs by measuring the potential differences between points on the body's surface.
The surface potentials are usually very small and must be amplified before they can be seen.
The surface potentials associated with the electrical activity of the heart are recorded by the ECP.
The four limbs and the heart are usually attached to the electrodes.
The voltage is measured between two wires.
The normal signal is shown in Figure 14.3.
A trained observer can see deviations from normal patterns.
The potentials along the surface of the scalp are measured by theEEG.
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