4.6 Article

Sub-Sm-1 electromagnetic induction imaging with an unshielded atomic magnetometer

Journal

APPLIED PHYSICS LETTERS
Volume 116, Issue 13, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/5.0002146

Keywords

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Funding

  1. UK Quantum Technology Hub in Sensing and Metrology, Engineering and Physical Sciences Research Council (EPSRC) [EP/M013294/1]
  2. EPSRC [EP/M013294/1] Funding Source: UKRI

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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 Rb-87 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 5ml of solutions down to 0.9 Sm-1. We measure a signal-to-noise ratio of 2.7 at 2MHz 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.

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