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Title: Magnetocardiography with a 16-channel fiber-coupled single-cell Rb optically pumped magnetometer

Abstract

We have constructed a low-cost, portable, high-sensitivity 16-channel optically pumped magnetometer (OPM), operating in the spin-exchange relaxation-free regime, and demonstrated its applications in magnetocardiography (MCG). The decrease in the cost of sensors by an order of magnitude is achieved by the 16-channel operation realized in a single module using a single large flat pancake rubidium vapor cell, broad pump and probe laser beams, and a 16-channel photodiode array. The OPM is also based on a fiber-coupled nearly parallel-beam configuration to facilitate multichannel design and make the system portable. For human MCG experiments, the 16-channel OPM which includes optical components is placed inside a wooden enclosure for laser safety. The enclosure is set on a nonmagnetic table inside a magnetically shielded room, while the lasers and electronics are placed outside the shielding room, to avoid magnetic noise. We show that the 16-channel OPM enables simultaneous imaging of human cardiac activity on a large area of the chest in a single scan. The multichannel capability will accelerate clinical MCG imaging to reduce the procedure time and patient fatigue.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1511632
Alternate Identifier(s):
OSTI ID: 1506738
Report Number(s):
LA-UR-19-21746
Journal ID: ISSN 0003-6951
Grant/Contract Number:  
89233218CNA000001; 20180131ER
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 114; Journal Issue: 14; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Kim, Young Jin, Savukov, Igor Mykhaylovych, and Newman, Shaun Garrett. Magnetocardiography with a 16-channel fiber-coupled single-cell Rb optically pumped magnetometer. United States: N. p., 2019. Web. doi:10.1063/1.5094339.
Kim, Young Jin, Savukov, Igor Mykhaylovych, & Newman, Shaun Garrett. Magnetocardiography with a 16-channel fiber-coupled single-cell Rb optically pumped magnetometer. United States. doi:10.1063/1.5094339.
Kim, Young Jin, Savukov, Igor Mykhaylovych, and Newman, Shaun Garrett. Fri . "Magnetocardiography with a 16-channel fiber-coupled single-cell Rb optically pumped magnetometer". United States. doi:10.1063/1.5094339. https://www.osti.gov/servlets/purl/1511632.
@article{osti_1511632,
title = {Magnetocardiography with a 16-channel fiber-coupled single-cell Rb optically pumped magnetometer},
author = {Kim, Young Jin and Savukov, Igor Mykhaylovych and Newman, Shaun Garrett},
abstractNote = {We have constructed a low-cost, portable, high-sensitivity 16-channel optically pumped magnetometer (OPM), operating in the spin-exchange relaxation-free regime, and demonstrated its applications in magnetocardiography (MCG). The decrease in the cost of sensors by an order of magnitude is achieved by the 16-channel operation realized in a single module using a single large flat pancake rubidium vapor cell, broad pump and probe laser beams, and a 16-channel photodiode array. The OPM is also based on a fiber-coupled nearly parallel-beam configuration to facilitate multichannel design and make the system portable. For human MCG experiments, the 16-channel OPM which includes optical components is placed inside a wooden enclosure for laser safety. The enclosure is set on a nonmagnetic table inside a magnetically shielded room, while the lasers and electronics are placed outside the shielding room, to avoid magnetic noise. We show that the 16-channel OPM enables simultaneous imaging of human cardiac activity on a large area of the chest in a single scan. The multichannel capability will accelerate clinical MCG imaging to reduce the procedure time and patient fatigue.},
doi = {10.1063/1.5094339},
journal = {Applied Physics Letters},
number = 14,
volume = 114,
place = {United States},
year = {2019},
month = {4}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

FIG. 1 FIG. 1: Principle of the multichannel operation in a single module based on a single large alkali-metal vapor cell filled with a helium buffer gas, broad pump (not shown) and probe beams, and a multichannel photodiode array. The buffer gas restricts the motion of alkali atoms, leading to multiple sensingmore » volumes in the cell. A circularly polarized broad pump beam polarizes spins at each sensing volume (not shown). Magnetic images at each sensing volume are converted to optical images with a linearly polarized broad probe beam. The optical images are simultaneously read out with a multichannel photodiode array.« less

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.