The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 06, 1995
Filed:
Dec. 10, 1993
Anders Lekholm, Bromma, SE;
Helmut Reichenberger, Eckental, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
In a method and apparatus for identifying the spatial distribution of electrical impedance within an examination subject, a source of electrical current is electrically connected to at least two feed electrodes which impress a feed current from the source in an examination region of a subject. The resulting magnetic field is measured at points outside the examination region, and an equivalent current density distribution is reconstructed within the examination region from the measured values of the magnetic field by an evaluation unit. A compensation conductor is connected to the current source. The current source delivers a compensation current, which flows in a direction opposite to the feed current, through the compensation conductor loop, so that the magnetic field generated by the feed current in the connecting lines is compensated. The evaluation unit identifies the spatial distribution of the impedance from the equivalent current density distribution. The spatial distribution of the impedance can be portrayed on a display.