Deans, C; Marmugi, L; Renzoni, F; (2020) Sub-Sm-1 electromagnetic induction imaging with an unshielded atomic magnetometer. Applied Physics Letters , 116 , Article 133501. 10.1063/5.0002146.

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Abstract

Progress in electromagnetic induction imaging with atomic magnetometers has brought its domain to the edge of the regime useful for biomedical imaging. However, a demonstration of imaging below the required 1 Sm−1 level is still missing. In this Letter, we use an 87Rb radio frequency atomic magnetometer operating near room temperature in an unshielded environment to image calibrated solutions mimicking the electric conductivity of live tissues. By combining the recently introduced near-resonant imaging technique with a dual radio frequency coil excitation scheme, we image 5 ml of solutions down to 0.9 Sm−1. We measure a signal-to-noise ratio of 2.7 at 2 MHz for 0.9 Sm−1, increased up to 7.2 with offline averaging. Our work is an improvement of 50 times on previous imaging results and demonstrates the sensitivity and stability in unshielded environments required for imaging biological tissues, in particular for the human heart. This work was supported by the UK Quantum Technology Hub in Sensing and Metrology, Engineering and Physical Sciences Research Council (EPSRC) (No. EP/M013294/1). We thank Dr. Helena Wong and Professor Andrea Sella (UCL Department of Chemistry) for the loan of the conductivity meter and guidance on its operation.

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