초록 ▼

A system for combining electromagnetic position and orientation tracking with magnetic resonance scanner is provided. One embodiment includes a magnetic resonance scanner defining a reference coordinate system for scanning a target. Coupled to the magnetic resonance scanner is a magnetic field sourc

A system for combining electromagnetic position and orientation tracking with magnetic resonance scanner is provided. One embodiment includes a magnetic resonance scanner defining a reference coordinate system for scanning a target. Coupled to the magnetic resonance scanner is a magnetic field source which produces a magnetic field. The magnetic field is sensed by a magnetic field sensor which produces a signal proportional to the magnetic field. The magnetic field sensor has a location relative to the reference coordinate system. The location of the magnetic field sensor relative to the reference coordinate system of the magnetic resonance scanner is determined by a location tracking device using at least a line segment model of the magnetic field source and the signal from the magnetic field sensor.

대표청구항 ▼

A system for combining electromagnetic position and orientation tracking with magnetic resonance scanner is provided. One embodiment includes a magnetic resonance scanner defining a reference coordinate system for scanning a target. Coupled to the magnetic resonance scanner is a magnetic field sourc

A system for combining electromagnetic position and orientation tracking with magnetic resonance scanner is provided. One embodiment includes a magnetic resonance scanner defining a reference coordinate system for scanning a target. Coupled to the magnetic resonance scanner is a magnetic field source which produces a magnetic field. The magnetic field is sensed by a magnetic field sensor which produces a signal proportional to the magnetic field. The magnetic field sensor has a location relative to the reference coordinate system. The location of the magnetic field sensor relative to the reference coordinate system of the magnetic resonance scanner is determined by a location tracking device using at least a line segment model of the magnetic field source and the signal from the magnetic field sensor. ve to said elapsed time signal exceeding said reference time signal to generate a third stop signal, said comparator further operative to compare said sensed signal with said reference average signal and responsive to the differential between said sensed signal and said reference average signal exceeding a predetermined positive magnitude to generate a fourth stop signal and responsive to the differential between said sensed signal and said reference average signal exceeding a predetermined negative magnitude to generate a fifth stop signal; and a control circuit connecting said connectors in circuit with said comparator and including a voltage regulator and reverse voltage polarity protection diode to regulate power received from said battery power source to a predetermined voltage level suitable for said controller memory and logic circuits, said control circuit further including a field effect transistor (FET), said control circuit responsive to a start signal to turn on said FET to communicate power to said motor and responsive to either said first, second, third, fourth or fifth stop signals, to turn off said FET to remove power from said motor. 16. The controller of claim 15 wherein: said memo