Surgery – Truss – Pad
Patent
1979-03-26
1981-04-28
Michell, Robert W.
Surgery
Truss
Pad
324 62, A61B 504
Patent
active
042639204
ABSTRACT:
Determining the internal structure of a body, for example, a human body, by means of an electric field which extends between individual electrodes of an electrode array which at least partly surrounds the body. Each time the value of the currents flowing through the individual electrodes is measured. From the currents electrical resistance values in individual tubes of flux generated between the electrodes are measured. By exposure of the body successively to electric fields which each have a different direction and by measurement of the resistance values then occurring, the specific resistance in individual elements of a matrix which is imagined to be stationary with respect to the body can be determined. From the given distribution of the specific resistance in the elements of the matrix, resistance values are calculated in all tubes of flux successively at least once for each field direction. For determination of a correction for the specific resistance in the elements of the matrix, the calculated resistance values are compared with the measured resistance values. The magnitude of the difference determines the magnitude of the correction.
REFERENCES:
patent: 3452743 (1969-07-01), Rieke
patent: 3784908 (1974-01-01), Anderson
patent: 3971366 (1976-07-01), Motoyama
Swanson, D. K., "Measurement Errors and Origin of Electrical Impedance Changes in the Limit," Thesis Subm. to Grad. Sch., Univ. of Wisc-Madison, May 17, 1976, Ch. IX pp. 180-195.
Henderson, R. P. et al., "An Impedance Camera for Spatially Specific Measurements of the Thorax," IEEE Biomed. Engr. Trans., vol. BME25, No. 3, May 1978, pp. 250-254.
Schomberg Hermann
Tasto Manfred
Briody Thomas A.
Haken Jack E.
Jaworski Francis J.
Mayer Robert T.
Michell Robert W.
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