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201 results about "Magnetic resonance scanner" patented technology

A magnetic resonance imaging instrument (MRI scanner), or "nuclear magnetic resonance (NMR) imaging" scanner as it was originally known, uses powerful magnets to polarize and excite hydrogen nuclei (single proton) in water molecules in human tissue, producing a detectable signal which is spatially encoded, resulting in images of the body.

Magnetic resonance scanner with electromagnetic position and orientation tracking device

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.
Owner:JAKAB PETER D

Method and device for automated generation of a formal description of a magnetic resonance system measurement sequence, using a sequence model

A magnetic resonance sequence model that is a formal description of a measurement sequence is used to automate measurement sequence programming. The sequence model allows a system-independent specification of the measurement sequence for execution in a magnetic resonance scanner. The sequence model is as formal as possible; it is limited to the minimum required information for description of a measurement sequence without limiting the flexibility in the sequence programming. A method for formal description of the measurement sequence describes the measurement sequence by a number of parameters to be parameterized. The parameterization of the measurement sequence can ensue automatically from the formalized description of the measurement sequence, except for a set of parameters that are still be determined. For automatic generation of an executable measurement sequence, the method determines the parameters to be determined using a solver, under consideration of boundary conditions, so that a consistent set of parameters is created that completely describes the measurement sequence. This complete description of parameter values of the measurement sequence is then be translated automatically into a programming language that can be directly executed in the magnetic resonance scanner.
Owner:SIEMENS HEALTHCARE GMBH

Method For Generating MR Images And An Appropriately Designed Magnetic Resonance System

An embodiment of the invention relates to the generation of MR images of a volume section within an examination object by way of a magnetic resonance scanner. In at least one embodiment, the following steps are performed: generating at least one of the MR images; automatically performing a number of quality inspections on the at least one MR image; and, should one of these quality inspections fail, an action is automatically performed in order to improve a quality when generating more of the MR images.
Owner:SIEMENS HEALTHCARE GMBH

Method and magnetic resonance tomography system to generate magnetic resonance image data of an examination subject

A method and magnetic resonance tomography system to generate magnetic resonance image data of an examination subject, raw imaging data are acquired from multiple slices of a predetermined volume region of the examination subject using local coils during a table feed in the magnetic resonance scanner. Image data of the slices are reconstructed on the basis of the raw imaging data. A normalization of the image data is subsequently implemented on the basis of measured coil sensitivity data of the local coils that are used.
Owner:SIEMENS HEALTHCARE GMBH

Fractional anisotropy microstructure characteristic extraction method based on kurtosis tensor and apparatus thereof

The invention relates to the image processing and medical instrument technology field and provides a burgeoning parameter extraction method of biological tissue anisotropy detection, wherein the method is used for clinic application. An analysis method of reconstructing and quantizing a clear, refine and highly-stable biological-tissue microcosmic anisotropy characteristic and a correlation apparatus are obtained. In a technical scheme used in the invention, based on the kurtosis-tensor fractional anisotropy microstructure characteristic extraction method, a subject collects multiple b value diffusion weight images of tissues along a plurality of diffusion sensitivity gradient directions on a magnetic resonance scanner; after the diffusion weight images are preprocessed, in an individual space, a second-order diffusion tensor and a fourth-order kurtosis tensor matrix reflecting a water molecule diffusion distribution probability density function characteristic in the tissues are acquired through fitting; through matrix operation, the corresponding fractional anisotropy FA and kurtosis tensor fractional anisotropy KTFA are acquired; and combining a characteristic parameter, a nerve fiber microstructure characteristic is acquired. The method and the apparatus are mainly used in medical equipment designing and manufacturing.
Owner:TIANJIN UNIV

Diffusion-weighted imaging method

The invention discloses a diffusion-weighted imaging method comprising the following steps: a plurality of b-value DWI images of a testee are collected via a magnetic resonance scanner, and noise reduction operation is performed on the DWI images via an SVD-PCA-based method; after the noise reduction operation, the DWI images are obtained and subjected to non-linear fitting operation, and estimated parameters of noncoherent motion in voxel can be obtained; the parameters comprise true diffusion coefficients, false diffusion coefficients and perfusion scores. According to the diffusion-weighted imaging method, after singular values of a vector composite matrix are filtered, noise components of the DWI images can be effectively removed; a signal to noise ratio can be improved, and therefore reliability of the estimated parameters of the noncoherent motion in the voxel can be improved.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
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