Siemens Aktiengesellschaft

Siemens Healthcare Gmbh

Jochen Ostermaier

Carl Udo Maier

Hans-Gerd Brummel

Uwe Linnert

Uwe Pfeifer

Stephan Biber

Stefan Hain

Heike Barlag

Kay Uwe Seemann

Matthias Baer-Beck

Jürgen Götz

Ferdinand Distler

Volker That

Frauke Eenboom

A method is used to calibrate a light unit, including at least one light source, the light unit being part of a medical imaging apparatus. In an embodiment, the method includes positioning a calibration phantom at a calibration position, in particular a first calibration position; arranging the light source so that its beam illuminates the photodetector at least partially; starting or continuing the recording of light intensities using the photodetector; modulating the signal of the light source at least once; rotating the light beam around a given rotation axis while recording the rotational position; synchronizing the time values of the rotational position of the light beam and the acquired signal intensities using the modulation of the light signal; and mapping the rotational position, in particular the rotation angle, of the light beam to a spatial position using the light intensities recorded by the photodetector.

Method to calibrate a light unit, storage medium, aperture plate and medical imaging apparatus

A magneto-elastic force sensor includes a sensor head () that has an emitting coil () which generates a magnetic field and at least one magnetic field sensor () for measuring a magnetic flux caused by the magnetic field of the emitting coil () in a measured object (). The sensor head () also includes a recorder () for recording an electrical value that reflects the inductivity of the emitting coil () or that is clearly connected to the latter. The magneto-elastic force sensor allows for compensation of a distance dependency in the measurement signal by ascertaining the distance between the emitting coil () or the sensor head () and the measured object () based on the recorded electrical value and by compensating the distance dependency in the measurement signal based on the ascertained distance.

Magneto-elastic force sensor and method for compensating distance dependency in a measurement signal of such a sensor

A measurement head () for a magnetoelastic sensor having a ferrite core (). The core () has a first end (), on which a field coil () which generates a magnetic field is fitted, and at least a second end (), on which a magnetic field sensor () is fitted.

Measurement head for a magnetoelastic sensor

A magnetoelastic torque sensor () has an emission coil () for generating a magnetic field in an object (), the torque of which is to be determined. The emission coil is axially oriented (A) and has an axial emission coil end surface () which can be guided towards the object (). At least two reception coils () at a distance from the emission coil and having, respectively, a receiving coil end surface () which can be guided towards the object () to capture a response signal induced in the object () by the magnetic field of the emission coil (). At least the receiver coil end surface () of one of the receiver coils protrudes beyond the emission coil end surface () to a selected distance from the object ().

Magnetoelastic torque sensor

A torque sensor arrangement including a contactless torque sensor, in which the torque sensor is arranged on an electrically operating linear carriage is provided. A distance sensor is also arranged on the linear carriage such that it allows the distance to the object of which the torque is to be determined to be measured.

Torque sensor arrangement and shaft comprising a torque sensor arrangement

At least one non-stationary coil in a magnetic resonance tomography system is attached with a fastener to a displaceable bed. The fastener has a position detector incorporated therein to determine the position or a component of the position of the non-stationary coil. The portion of the position is, for example, the position along the axis of symmetry of the measurement tube.

Patient bed, local coil arrangement and method to determine the position of local coils in a magnetic resonance apparatus

A damping system for damping torsion vibrations of shafts in machines is provided. A torque sensor detects torsion vibrations. A magnetostrictive actuator device creates a mechanical counter-vibration and a control device registers a measurement signal of the torque sensor in a time-resolved manner and creates a phase-shifted signal for a counter-vibration and drives the actuator device. Further, a method for eliminating torsion vibration of shafts in machines with such a damping system is provided. The torsion vibration of the torque of the shaft is registered in a time-resolved manner, a phase-shifted signal is created for a counter-vibration, and a mechanical counter-vibration is created using at a magnetostrictive actuator device.

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Erlangen, Germany

Jochen Ostermaier