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Bruker Analytische Messtechnik Gmbh

Bruker Medizintechnik Gmbh

Bruker Analytic

Spectrospin Ag

Gunther R Laukien

Michael Westphal

Arne Kasten

Reinhard Biehl

Paul Vincent

Dieter Schmalbein

Wolfgang H Muller

Werner H Tschopp

Bertold Knuttel

Toni Keller

Manfred Spraul

Heinz D Zeiger

Tony W Keller

Dieter Koch

Bertold Knuettel

In an NMR tomograph with superconducting main field coil (10) and large transverse access opening a compensation of inhomogeneities of the static magnetic field without hindering the axial and transverse access to the investigational volume (V) can be effected by the following elements: ferromagnetic homogeneity elements (20) which are arranged on the surface of the room temperature bore on both sides of the transverse access opening; at least one or more (a number p.gtoreq.1) superconducting correction coils (C.sub.1 and C.sub.p) which can be separately supplied with current and which are coaxial to the main field coil (10), whereby each correction coil (C.sub.1 through C.sub.p) comprises at least two partial coils (C.sub.1i, C.sub.1a through C.sub.pi, C.sub.pa), whereby all partial coils of all correction coils (C.sub.1 through C.sub.p) are cylindrical coils coaxial to a common axis (z) having a diameter less than the inner diameter (d.sub.a2) of the outer field coil (1a, 1b), whereby in each correction coil one partial coil (C.sub.1i through C.sub.pi) has, in each case, as small a separation from the middle plane (E) as possible generally equal to the separation of the radially inner field current pair (2a, 2b) from the middle plane and whereby each correction pair has, in each case, at least one second partial coil (C.sub.1a through C.sub.pa) with an oppositely directed current which has a larger axial separation from the middle plane (E) than the radially inner field coil pair (2a, 2b).

Therapy tomograph with homogeneity device

In an NMR tomograph with superconducting main field coil (10) and large transverse access opening a compensation of inhomogeneities of the static magnetic field without hindering the axial and transverse access to the investigational volume (V) can be effected by the following elements:

A nuclear spin resonance (NMR) measuring device, in particular an NMR tomography apparatus with a preferentially superconducting main field coil which is capable of producing, within a measurement volume whose center is coincident with the origin of a Cartesian coordinate system x, y, z, a homogeneous static magnetic field B.sub.0 in the direction of the z-axis of this coordinate system and with a tesseral gradient coil system for the production of magnetic gradient fields with a largely linear dependence within the measuring volume in a direction perpendicular to the z-axis, whereby the gradient coil system comprises at least four largely identical saddle-type partial coils arranged symmetrically with radial and axial separations from the coordinate origin, the partial coils each exhibiting two electrically conducting segments which run about the z-axis in the azimuthal direction one segment (21) of which has as small a radial separation r.sub.1 and the other segment (22) as large a radial separation r.sub.2 as possible from the z-axis, is characterised in that both azimuthal segments (21, 22) exhibit an axial separation from each other in the direction of the z-axis, whereby the radially outer segment (22) with the radial separation r.sub.2 from the z-axis is, with respect to the z-axis, arranged axially closer to the coordinate origin than the radially inner segment (21) with a radial separation r.sub.1 from the z-axis, and whereby both segments (21, 22) are connected to each other by means of conducting sections (23). With this configuration an unhindered sideward access to the investigational volume of the NMR measuring device is achieved with sufficient produced gradient field linearity in the measuring volume.

Gradient coils for therapy tomographs

Method and apparatus for the propulsion of water vehicles

A method and an apparatus for predicting the future occurrence of earthquakes continuously measures a physical parameter of the earth's crust by means of magnetic spin resonance measurements to develop an alarm signal. When the value of the alarm signal exceeds a threshold value, an alarm is generated.

Method and apparatus for the predication of earthquakes

Method and apparatus for localizing submarines

A method and a submarine are disclosed influencing an acoustic source emitting an acoustig signal having a first frequency spectrum with at least one intensity maximum. In order to make detection of the frequency spectrum by means of passive acoustic locating systems more difficult, the first frequency spectrum is stochastically modulated by influencing the acoustic source.

Method for influencing an acoustic source, in particular of a submerged

An electron beam x-ray computer tomography scanner is improved so that a compact, tiltable configuration without mechanical motion is achieved. By introducing the electron beam in a direction which is largely parallel rather than perpendicular to the scan plane, the long large diameter evacuated electron beam pipe of prior art is eliminated. As a result, the scan system according to the invention enjoys compact dimensions compared to those of prior art, and free access to the scan region from both the front and back of the scanner is possible.

Electron beam x-ray computer tomography scanner

An X-ray computer tomography system with a stationary ring anode and a plurality of stationary electron sources for the construction of fast scan images from the inside of an object is improved in such a way that there is free access from both sides of the scan region, that the gantry unit can be tilted, and that the image quality which can be achieved is comparable to that of conventional tomography systems with mechanical motion of the anode. A plurality of electron sources are configured in proximity to the ring anode on a stationary ring, with each source being capable of sweeping its respective electron beam over a portion of the anode ring.

X-ray computer tomography system

An X-ray computer tomography system with a ring anode and substantially without mechanically moving parts for the production of fast image slices from the inside of an object is improved in such a way that a detector ring is comprised of two adjacent parallel partial detector rings of substantially equal size, whereby the detector ring is arranged within and coplanar to the anode ring. The two partial rings of the detector ring are displaced in a direction largely pependicular to the scan slice so that a ring-shaped detector ring gap is formed between them through which the fan beam coming from the focal spot on the anode passes.

X-ray computer tomography system with split detector ring

Magnet system

Method of operating submerged submarines and submarine

Underwater vehicle with a passive optical observation system

A method and an apparatus are disclosed serving to minimize acoustic emission of submerged submarines. Moving mechanical elements in an inner region give off vibrations onto an outer hull via a vibration transmission path. The vibrations are damped with damping means in the vibration transmission path. The damping means is configured as an evacuated intermediate space and is inserted in the vibration transmission path.

Growing community of inventors

Rheinstetten, Germany

Gunther R Laukien