Performance evaluation of a diamond quantum magnetometer for biomagnetic sensing: A phantom study
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.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (13)
Naota Sekiguchi
Department of Electrical and Electronic Engineering, School of Engineering, Institute of Science Tokyo 1 , Meguro, Tokyo 152-8552,
Yuta Kainuma
Department of Electrical and Electronic Engineering, Institute of Science Tokyo 1 , Meguro, Tokyo 152-8550,
Motofumi Fushimi
Department of Bioengineering, The University of Tokyo 2 , Bunkyo, Tokyo 113-8656,
Chikara Shinei
Research Center for Electronic and Optical Materials, National Institute for Materials Science 2 , Tsukuba, Ibaraki 305-0044,
Masashi Miyakawa
Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
Takashi Taniguchi
Tokuyuki Teraji
Research Center for Electronic and Optical Materials, National Institute for Materials Science 2 , Tsukuba, Ibaraki 305-0044,
Hiroshi Abe
Shinobu Onoda
Takasaki Institute for Advanced Quantum Science, National Institutes for Quantum Science and Technology: QST 5 , Takasaki, Gunma 370-1292,
Takeshi Ohshima
Mutsuko Hatano
Department of Electrical and Electronic Engineering, Institute of Science Tokyo 4 , Meguro-ku, Tokyo 152-8552,
Masaki Sekino
Takayuki Iwasaki
Department of Electrical and Electronic Engineering, Institute of Science Tokyo 4 , Meguro-ku, Tokyo 152-8552,