Analog optical transmission is incorporated to improve the noise immunity of the lead of ambulatory ECG system. Immunity for the magnetic artifacts is improved by50dB by replacing the electrical leads with an optical fiber. The effect of nonlinearity of electrooptical portion was successfully suppressed as low as0.4%by the digital equalization.

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Now, we have relied upon X-rays for the diagnosis of such diposits, even though minute particles lodged in the lungs for long periods are almost impossible to detect with X-rays. Thus illnesses are not detected until the condition worsens and produces changes in the structure of the lungs. When such condition become detectable with X-rays, it is already too late to transfer the patient within the company:after the particulates have been deposited in the lungs, there is a tendency for the illness to progress. In any case, then, it's essential that we know the quantity of particles in the lungs before illness occurs. It is the method of the lung's magnetic figure that measure the total quantity and distribution of materials accumulated in the lungs by using the magnetic characteristic of particles. This method adds a magnetic field of strong direct current from the outside to particles are accumulated in the lungs. it magnetizes the particles and after taking out the outside magnetic field, these particles occur a slight magnetic field outside as a remaining magnetism. It's possible to get the quantity and distribution of particles are accumulated in the lungs by measuring this magnetic field on the surface of the body.

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