Radio-Frequency Atomic Magnetometers for Medical Applications

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The project aims to combine a novel approach to measurement (mapping of low-conductivity samples) with the implementation of a novel type of sensor which results in a Magnetic Induction Tomography system for medical applications. This relies on a recent (2014) breakthrough by the UCL team, the demonstration of electromagnetic imaging with atomic magnetometers, and the subsequent (2016) proposal for its application in the diagnosis of atrial fibrillation. So far, only passive magnetic field mapping of the heart with a non-invasive method has been possible, whereas other conductivity mapping techniques require surgery. The developed technique for magnetic heart imaging through magnetic induction tomography would provide an unique alternative to invasive mapping of arrhythmia. The proposed research includes the following activities: (a) The assembly of an rf-atomic magnetometer portable system, and the evaluation of its performance in unshielded environment. This is required to assess the suitability for the operation in a clinical environment.(b) Demonstration of magnetic induction at 1 MHz, and determination of the sensitivity of the apparatus for this type of measurements. This will be done by inducing eddy currents in a sample object and detecting the resulting magnetic field. The aim is to be able to detect a disk of 1 mm diameter and 1 mm thickness, and with conductivity corresponding to biological samples. This will pave the way for the use of the magnetometer in imaging for medical applications which will be the object of the research beyond the feasibility study associated with the present proposal. (c) Development of the detection system components that will allow integration with imaging system.