<ul><li>In 1963, Gerhard Baule and Richard McFee first measured the magnetic field generated by the human body, known as a magnetocardiogram (MCG).</li><li>To measure the MCG, they wound two million turns of wire around a dumbbell-shaped ferrite core and detected the induced voltage in the pickup coil.</li><li>The MCG has a low magnetic field strength, on the order of 50-100 pT, which is much weaker than the magnetic field in an MRI machine.</li><li>Baule and McFee used gradiometers and subtracted the output of two pickup coils to minimize background noise during MCG measurement.</li></ul>

The First Measurement of the Magnetocardiogram

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