Apparatus and method for decreasing bio-effects of magnetic gradient field gradients

a magnetic field gradient and bio-effect technology, applied in the field of apparatus and a method for decreasing the bio-effects of magnetic field gradients, can solve the problems of mri diagnostic requiring a substantial amount of time, magnetic field gradients eliciting undesirable responses from tissue, and formation of electric fields, so as to reduce the bio-effects

Active Publication Date: 2011-04-21
WEINBERG MEDICAL PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

The invention relates to reducing biological effectiveness caused when there're no external stimuli applied during certain periods or times while treating diseases with magnetism. This can be done through an alternating current (AC) electromagnetic waveform generated outside your body at specific frequencies called Larmor frequency which are lower than those used inside our bodies.

Problems solved by technology

Technical Problem addressed in this patented technical paper relates to reducing the length required for magnetization during excitation in magnetoelastic nuclear spin tomography machines. Current methods involve setting specific values called parameters within each measurement interval before initiating the process of generating new waveforms through different processes like voltage decay times. Additionally, previous attempts were made to use switching circuits instead of conductivity measurements to generate magnequench signals.

Method used

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  • Apparatus and method for decreasing bio-effects of magnetic gradient field gradients
  • Apparatus and method for decreasing bio-effects of magnetic gradient field gradients
  • Apparatus and method for decreasing bio-effects of magnetic gradient field gradients

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Embodiment Construction

[0046]Inventive concepts will now be described in connection with one or more embodiments. It is intended for the embodiments to be representative of the invention and not limiting of the scope of the invention. The invention is intended to encompass equivalents and variations, as should be appreciated by those skilled in the art.

[0047]Disclosed embodiments take advantage of a physiological loophole: according to accepted physiological models for ionic channel transport, bi-phasic pulses on the order of a microsecond are too fast for the nerve to change its polarization state, and are, therefore, effectively ignored. Disclosed embodiments capitalize on this physiological loophole. According to the model elaborated by Reilly, this loophole implies that gradient field thresholds may be increased by factors of five or more above the usual hyperbolic model without triggering any bio-effects.

[0048]Disclosed embodiments also takes advantage of magnetic pulse delivery systems that are more po

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Abstract

A magnetic field generator includes a power source and a segmented or un-segmented coil connected to the power source to generate a time-varying magnetic field. Energy is applied to the coil so that the coil generates a time-varying magnetic field gradient with a magnitude of at least 1 milliTesla per meter and a rise-time of less than 10 microseconds. The coil may be comprised of overlapping, non-overlapping or partially overlapping coil segments that may individually energized to further improve the operating characteristics of the coil to further decrease bio-effects in magnetic resonance imaging through the use of reduced pulse lengths and multi-phasic magnetic gradient pulses.

Description

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Claims

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Application Information

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Owner WEINBERG MEDICAL PHYSICS
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