SQUID (Superconducting Quantum Interference Device) Arrays for Simultaneous Magnetic Measurements: Calibration and Source Localization Performance.

reportActive / Technical Report | Accession Number: ADA193815 | Open PDF

Abstract:

Recently developed small arrays of SQUID-based magnetic sensors can, if appropriately placed, locate the position of a confined biomagnetic source without moving the array. The authors present a technique with a relative accuracy of about 2 for calibrating such sensors having detection coils with the geometry of a second-order gradiometer. The effects of calibration error and magnetic noise on the accuracy of locating an equivalent current dipole source in the human brain are investigated for 5- and 7-sensor probes and for a pair of 7-sensor probes. With a noise level of 5 of peak signal, uncertainties of about 20 in source strength and depth for a 5-sensor probe are reduced to 8 for a pair of 7-sensor probes, and uncertainties of about 15 mm in lateral position are reduced to 1 mm, for the configuration considered.

Author(s):
Kaufman, Lloyd ; Williamson, Samuel J. ; Costa Ribeiro, P.
Author Organization(s):
NEW YORK UNIV N Y
Descriptive Note:
Rept. for Sep 86-Feb 88,
Pagination:
0026

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFOSR-TR-88-0364
Contract/Grant Number(s):
F49620-86-C-0131, F49620-85-K-0004
Task Number(s):
A4
Project Number(s):
3484
Monitor Series:
TR-88-0364
 Subject Terms
Joint Capability Areas:
JCA_6.1.1_Wired Transmission; JCA_6_Net Centric; JCA_1.2_Force Preparation; JCA_1_Force Support; JCA_8.2_Shape; JCA_8_Building Partnerships; JCA_5_Command and Control; JCA_6.1_Information Transport
Modernization Areas:
Quantum Science and Computing
Communities of Interest:
Sensors
Descriptor(s):
*BIOMAGNETISM, *MAGNETIC DETECTORS, ACCURACY, ARRAYS, BRAIN, CALIBRATION, COILS, CONFINEMENT(GENERAL), DETECTION, DETECTORS, DIPOLES, ERRORS, HUMANS, INTERFERENCE, LEVEL(QUANTITY), MAGNETIC FIELDS, MAGNETIC PROPERTIES, MEASUREMENT, PEAK VALUES, QUANTUM THEORY, SIGNALS, SOURCES, STRENGTH(GENERAL), SUPERCONDUCTIVITY, SYNCHRONISM, QUANTUM ELECTRONICS, ELECTROMAGNETIC INTERFERENCE, NOISE(ELECTRICAL AND ELECTROMAGNETIC), BIOMEDICINE
Field(s)/Group(s):
Electricity and Magnetism, Magnetic and Electric Field Detection and Detectors, Biomedical Instrumentation and Bioengineering
Keyword(s):
SQUID(Superconducting Quantum Interference Devices), WUAFOSR3484A4, PE61103D
Report Date:
1988 Feb 29