Luckily, there are other options. For example, magnetocardiography is a promising alternative approach to measuring heart currents indirectly. The technique involves sensing minute changes in the magnetic field near the heart caused by cardiac currents. This can be done in a completely contactless manner. To this end, various types of quantum sensors suitable for this purpose have been developed.
The researchers created an MCG setup using a 532 nm laser to excite the diamond sensor and a photodiode to capture the re-emitted photons . They also developed mathematical models to accurately map these captured photons with the corresponding magnetic fields and, in turn, with the cardiac currents responsible for them.
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