Other

Siemens Aktiengesellschaft

Simag Gmbh

Amedo Smart Tracking Solutions Gmbh

Martin Busch

Andreas Melzer

Michael Friebe

Heinrich Schlichting

Jürgen Speder

Michael Wendt

Dietrich H W Grönemeyer

Alfredo Hummel

Axel Bornstedt

Rainer Seibel

Dietrich Groenemeyer

Alexander Jovy

The invention relates to a medical implant or instrument, particularly a vascular endoprosthesis (stent), comprising a deformable structural part. In order to provide an implant of this type that is magnetic resonance-compatible and can be easily and economically produced, the invention provides that the structural part has a two-layer or multilayer design, whereby layers () have different electrical and/or magnetic properties. The invention particularly provides that the structural part has a frame structure with openings () whereby, in different layers () of the structural part, the openings () are each located at different positions not directly located one above the other.

Magnetic resonance-compatible medical implant

The invention relates to a medicinal implant or instrument, more particularly to a vascular endoprosthesis (), having a radially dilatable hose part () comprised of a tubular knitted fabric of interdigitating meshes composed of one or more individual fibres (). To provide such an implant or instrument that allows for MR-imaging of the interior of the implant or instrument, the invention proposes that the fibres () of the knitted fabric be electrically conductive and form an inductor () within a high-frequency resonant circuit.

MR-compatible vascular endoprosthesis

The invention relates to an MR imaging method for representing and determining the position of a medical device inserted in an examination object, and to a medical device used in the method. In accordance with the invention, the device () comprises at least one passive oscillating circuit with an inductor () and a capacitor (). The resonance frequency of this circuit substantially corresponds to the resonance frequency of the injected high-frequency radiation from the MR system. In this way, in a locally limited area situated inside or around the device, a modified signal answer is generated which is represented with spatial resolution.

MR imaging method and medical device for use in method

The invention relates to a magnetic resonance imaging process for the imaging and determination of the position of a stent introduced into an examination object as well as to the stent so utilized. According to the invention, the stent has at least one passive resonance circuit with an inductance and a capacitance whereby its resonance frequency is essentially equal to the resonance frequency of the applied high-frequency radiation of the magnetic resonance system. A changed signal response is thus produced in a locally defined area in or around the stent which is imaged in spatial resolution.

Stent and MR imaging process for the imaging and the determination of the position of a stent

Method and apparatus for producing benefit/risk evaluation data relating

In a method for the location determination of a positionable object in an examination subject by means of magnetic resonance and apparatus for the implementation of the method a reference image is acquired from at least one slice of the examination subject. The current position of the subject is determined by at least one radio-frequency reception coil attached to the object. A slice position in which the reference image is updated is determined on the basis of this current position.

Magnetic resonance apparatus and method for determining the location of

For obtaining image information from a subject, in an excitation phase nuclear resonance signals are excited with wavelet-encoding by emitting a radio-frequency pulse under the influence of a gradient in a first direction, the pulse having an envelope that corresponds to the Fourier transforms of a wavelet function. In addition, a layer selection is achieved by the application of an oscillating gradient in a second direction. In a readout phase, a gradient echo signal is sampled under the influence of a readout gradient in a third direction. The pulse sequence can be repeated with a repetition time that is shorter than the longitudinal and transverse relaxation time, so that a steady state arises.

Method for magnetic resonance image acquisition and reconstruction of

In a method for the acquisition and evaluation of data obtained in a nuclear magnetic resonance tomography apparatus, only data for a constant sub-region of an overall dataset, that was obtained from a preceding measurement, are updated by new measured data in subsequent successive measurements (keyhole method). In order to sharply reproduce measurement subjects in the visual display which move from measurement to measurement while only slightly lengthening the registration time in comparison to a standard keyhole measurement sequence, data for difficult sub-regions of the overall dataset are additionally updated from measurement to measurement, and these sub-regions are varied in a predetermined sequence from measurement to measurement.

Growing community of inventors

Witten, Germany

Martin Busch