Compact and Easy-Operation Magnetocardiograph With Four-Channel Planar Gradiometers
Abstract
A magnetocardiograph (MCG), which consists of a sensor comprising four superconducting-quantum-interference device (SQUID) gradiometers and a magnetic shielding cylinder made of nanocrystalline soft magnetic materials, has been developed, The sensor can be handled easily because the gradiometers are made of high-critical-temperature (Tc) superconductor operated in liquid nitrogen, Further, the shielding cylinder is lightweight (160 kg) and compact (2 m long and 1 m in diameter) The gradiometer balance is high enough (typically 0,1%) for recording magnetocardiograms inside the shielding cylinder, whose shielding factor is -35dB at 1 Hz. We used the new MCG to record magnetocardiograms of a healthy volunteer at four different positions. From this magnetocardiograms we then obtained a current arrow map, by which mycardium activity can be estimated, at 16 sites (4 x 4 matrix) on the measurement plane, The similarity between the current-arrow map obtained by a conventional MCG and that from the newly developed MCG indicates that the developed compact MCG is also capable of estimating the region of cardiac activity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 25, 2001
- Accession Number
- ADA410174
Entities
People
- A. Kandori
- A. Tsukamoto
- D. Suzuki
- K. Yokosawa
- T. Miyashita
Organizations
- Hitachi