Skip to content
6CCVD Research

Performance evaluation of a diamond quantum magnetometer for biomagnetic sensing - A phantom study

At a Glance

Section titled “At a Glance”
MetadataDetails
Publication Date2025-05-12
JournalApplied Physics Letters
AuthorsNaota Sekiguchi, Yuta Kainuma, Motofumi Fushimi, Chikara Shinei, Masashi Miyakawa
InstitutionsInstitute of Science Tokyo, The University of Tokyo

Abstract

Section titled “Abstract”

We employ a dry-type phantom to evaluate the performance of a diamond quantum magnetometer with a high sensitivity of about 6 pT/Hz from the viewpoint of practical measurement in biomagnetic sensing. The dry phantom is supposed to represent an equivalent current dipole (ECD) generated by brain activity, emulating an encephalomagnetic field. The spatial resolution of the magnetometer is evaluated to be sufficiently higher than the length of the variation in the encephalomagnetic field distribution. The minimum detectable ECD moment is evaluated to be 0.2 nA m by averaging about 8000 measurements for a standoff distance of 2.4 mm from the ECD. We also discuss the feasibility of detecting an ECD in the measurement of an encephalomagnetic field in humans. We conclude that it is feasible to detect an encephalomagnetic field from a shallow cortex area such as the primary somatosensory cortex.

Tech Support

Section titled “Tech Support”

Original Source

Section titled “Original Source”

References

Section titled “References”
  1. 2021 - Toward quantitative bio-sensing with nitrogen-vacancy center in diamond [Crossref]
  2. 2023 - Quantum sensors for biomedical applications [Crossref]
  3. 2024 - Sensitive AC and DC magnetometry with nitrogen-vacancy-center ensembles in diamond [Crossref]
  4. 2024 - Diamond quantum magnetometer with DC sensitivity of sub-10 pT Hz−1/2 toward measurement of biomagnetic field [Crossref]
  5. 2024 - A spin-refrigerated cavity quantum electrodynamic sensor [Crossref]
  6. 2016 - SQUIDs in biomagnetism: A roadmap towards improved healthcare [Crossref]
  7. 1993 - Magnetoencephalography—Theory, instrumentation, and applications to noninvasive studies of the working human brain [Crossref]
  8. 2016 - Optical magnetic detection of single-neuron action potentials using quantum defects in diamond [Crossref]
  9. 2022 - Millimetre-scale magnetocardiography of living rats with thoracotomy [Crossref]
  10. 2018 - Robust high-dynamic-range vector magnetometry with nitrogen-vacancy centers in diamond [Crossref]

Reads Similar to This

The Electronic Structures and Energies of the Lowest Excited States of the Ns0, Ns+, Ns− and Ns-H Defects in Diamond Thermal Conductivity of Diamond Packed Electrospun PAN-Based Carbon Fibers Incorporated with Multi Wall Carbon Nanotubes Creation of NV centers over a millimeter-sized region by intense single-shot ultrashort laser irradiation