Siemens Aktiengesellschaft

Gerhard Roehrlein

Klaus Abraham-Fuchs

Siegfried Schneider

Heinrich Seifert

Reinhold Guempelein

A contactless data transmission system includes a laterally emitting optical conductor connected to an electro-optical data transmitter. The optical conductor is formed by a bundle of optical fibers provided with a transparent cladding, so that the optical conductor laterally emits signals along its entire length corresponding to the data signals which are coupled into the optical conductor. An opto-electrical detector is disposed at a location next to the optical conductor, for receiving the laterally emitted optical signals therefrom. The optical conductor and its data source, and the detector, can be respectively mounted on parts of a system which are relatively movable with respect to each other, such as the stationary frame and the rotating ring of a computer tomography apparatus.

Contactless data transmission device

Circuit arrangement for a gradiometer with super conducting quantum interferometer (SQUID) for measuring low-intensity biomagnetic fields. In the circuit arrangement a modulated output voltage that is proportional to a measured magnetic field is supplied to an analog-to-digital converter for digitization and quantization, a modulated output signal of the analog-to-digital converter serving as a digital measured signal.

Circuit arrangement for a gradiometer having superconducting quantum

In a method for calibrating multi-channel SQUID systems having gradiometers of an arbitrary order, calibration coils, each having the same number of ampere turns are symmetrically arranged at identical distances between the parallel coil planes with respect to every gradiometer coil, so that every gradiometer coil is penetrated by a common, oppositely directed magnetic field generated by the calibration coils. The field that the calibration coils produce at the locations of the gradiometer coils are numerically calculated to obtain a net gradient field value which is divided by the measured voltage at the output of the allocated SQUID electronics in order to calculate the calibration factor.

Method for calibrating SQUID gradiometers of an arbitrary order

In an arrangement for analyzing local bioelectric currents in biological tissue complexes, electrical signals measured by EEG and/or MEG sensors are supplied to a pattern recognition unit in which defined signal patterns are acquired and are provided with time markings to produce 'templates.' The templates are forwarded to a correlation unit which compares the continuous measured values to the templates, and calculates a correlation coefficient based on the comparison. A threshold definition unit identifies signal patterns from the continuously measured signal which transgress the threshold, and supplies the threshold-transgressing signal patterns to a comparison unit which compares the correlated signal to the threshold-transgressing signal. Signal patterns are selected based on this comparison which are temporally and spatially identical, and are supplied to an averaging unit, which forms temporal averages of the selected signal patterns. A localization unit identifies the geometrical location of any source in the pattern which is pathologically electrically active. These geometrical locations are supplied to a monitor together with a tomographic portrayal of the same region of the subject, and are superimposed on the tomograph display.

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Hoechstadt, Germany

Gerhard Roehrlein