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Magnetic induction tomography systems with coil configuration

A technology of tomographic imaging and exciting coils, applied in the direction of diagnosis, application, sensor, etc.

Inactive Publication Date: 2012-03-14
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this manner, there is no net flux from the generator coil through the sense coil

Method used

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  • Magnetic induction tomography systems with coil configuration
  • Magnetic induction tomography systems with coil configuration
  • Magnetic induction tomography systems with coil configuration

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Embodiment Construction

[0025] figure 1 A schematic representation of a magneto-impedance tomography system of the present invention is shown. The excitation system 10 includes an excitation coil 11 and an excitation circuit 13 . The excitation coil 11 is arranged on the cylindrical surface of the cylinder 12 . An excitation circuit 13 is provided to activate selected excitation coils. The excitation circuit 13 contains a current source for exciting the coil. For example an excitation circuit applies current to a pair of excitation coils 11 in a Helmholtz configuration (see figure 2 ). The excitation circuit 13 is controlled by the system computer 30 . The system computer can be a suitably programmed general purpose computer. Alternatively, the system computer is a specially configured processor.

[0026] The measuring system 20 includes a measuring coil 21 and a measuring circuit 22 . The measuring coil 21 has its center lying on the surface of a hemisphere. Accordingly, the measuring coil...

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Abstract

A magnetic impedance tomography system comprises an excitation system with several excitation coils to generate an excitation magnetic field to induce eddy currents in an examination volume. For example, a solenoid configuration or parallel coils, e.g. in a Helmholtz configuration are employed, Further, a measurement system is provided with several measurement coils to measure the fields generated by the induced eddy currents. The measurement coils are arranged in a volumetric (3D) geometrical arrangement. The individual measurement coils being orientated substantially transverse to the field line of the excitation magnetic field of the excitation coils. A reconstructor receives measurement data from the measurement system and reconstruct an image of an object in the volume of interest from the measurement data.

Description

technical field [0001] The invention relates to a magneto-impedance tomography (MIT) system with an excitation coil system and a measurement coil system. The excitation and measurement coils are placed around a volume of interest (VOI). In general, when an excitation coil is activated, eddy currents are generated in conductive objects within the VOI. The magnetic fields generated by these eddy currents are measured by measuring coils. The conductive properties of the object may be reconstructed (eg in the form of an image) from the acquired measurement data. Background technique [0002] Such a magneto-impedance tomography system is mentioned in US patent application US2008 / 0246472 as a system for inductively measuring the bio-impedance of conductive tissue. [0003] In known magneto-impedance tomography systems, a generator coil is provided for generating a main magnetic field through conductive material such as tissue. This flux induces eddy currents in the tissue. A ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/053
CPCA61B5/0522A61B5/0536A61B5/053
Inventor R·艾夏特A·L·麦塞万
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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