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43. P. L. M. Kerkhof Combination of Millar and conductance catheter for the estimation of left ventricular function in the equine heart, Proc. 21st Int. , IEEE Eng. Med. Biol. , 1999. 44. J. E. Axenborg B. Olsson, An electrical impedance method for measurement of aortic cross-sectional areas, Proc. XII Int. Conf. Med. Biol. , Jerusalem, 1979, P. 1. 45. L. Kornet Extension and imrovements of the electrical conductance method, Thesis, Erasmus University, Rotterdam, The Netherlands, 1996. 46. L. E.
Gheorghiu E. Gersing E. Gheoghiu Quantitative analysis of impedance spectra of organs during ischemia, Proc. 10th Int. Conf. Electrical Bio-impedance, 1998, pp. 73–76. 56. H. Schafer, ¨ et al. Dielectric properties of skeletal muscle during ischemia in the frequency range from 50 to 200 Hz, Proc. 10th Int. Conf. Electrical Bio-impedance, 1998, pp. 77–80. Further reading: S. Grimnes & Ø. G. Martinsen:“Bioimpedance and Bioelectricity Basics”, Academic Press (2000). ISBN 0-12-303260-1 D. S. Institute of Physics Publishing (2005).
The minimum distance of the coil from the scalp in a superconducting magnetometer is about 20 mm. The coil radius is usually about 10 mm. It has been shown (10) that with this measurement distance, decreasing the coil radius does not change the distribution of the sensitivity in the brain region. In the following the sensitivity distribution of these gradiometer constructions is discussed. To indicate the magnetometer’s ability to concentrate its sensitivity in a small region, the concept of half-sensitivity volume has been defined (15).