Helmholtz-zentrum Dresden-rossendorf E.v.

Technische Universitát Dresden

Forschungszentrum Dresden-rossendorf E.v.

Uwe Hampel

Eckhard Schleicher

Horst-Michael Prasser

Frank Fischer

Marco Jose Da Silva

Sebastian Unger

Marco José Da Silva

It is an object of the present invention to specify an arrangement for X-ray computed tomography, which allows continuous three-dimensional imaging of the examination object or a partial volume of the examination object at a high temporal and spatial resolution, wherein a high spatial resolution defines both a high resolution within the slice plane and also in the axial direction.

Arrangement for three-dimensional electron beam tomography

An assembly for electron beam tomography affords continuous and simultaneous recording of two-dimensional slice images of an object in different irradiation planes with a high temporal and spatial resolution. Targets are penetrated by openings of a given width and with a regular arrangement in the circumferential direction. The openings in the targets are respectively situated on a path formed by the cross section of the shell of the electron beam cone with the respective target. The successive targets in the beam direction respectively are arranged with a small angular offset with respect to the optical axis to the respective target situated in front, and so an electron beam circulating along the shell of the electron beam cone successively irradiates the material webs between the openings of all targets with at least part of its cross section and an X-ray detector arc is arranged for each target in coplanar radial fashion in front of or behind the respective target.

Arrangement for electron beam tomography

The aim of the invention is to produce an x-ray computed tomography arrangement in which there is no axial offset between the path of the focal spot and the x-ray detector arc. Said aim is achieved by: &#x2014;arranging the x-ray detector arc and the target around the examination cross-section within a radiation plane such that the x-ray focal spots generated by the deflected electron beam of the electron beam generator lie within an axial plane, the radiation plane, along with the active detector elements; &#x2014;disposing the x-ray detector arc behind the target in a radial direction such that each imaginary x-ray extending from a focal spot position on the target to a detector element of the x-ray detector arc penetrates the target, which lies in front of the point of incidence on the x-ray detector arc in the direction of radiation, in the area in which the target and the x-ray detector arc angularly overlap; &#x2014;producing the target from a target member which is preferably made of a material that has a low atomic number and great heat storage capacity or thermal conductance; &#x2014;applying an electron-decelerating material layer, preferably made of a refractory material that has a high atomic number, to the side of the target member which faces the electron beam.

X-ray computed tomography arrangement

Disclosed is an arrangement for quickly measuring the phase distribution or the component distribution in a flow cross section for substance mixtures also of a non-conducting type by measuring the complex electrical admittance. Said arrangement essentially features the following: at least one sine wave generator () which is mounted upstream from the transmitter electrodes () of the excitation level and applies an alternating voltage to the transmitter electrodes (); current-to-voltage converters () which are mounted downstream from the receiver electrodes (), amplify the alternating current that flows from at least one excitation electrode () through the medium to the receiver electrodes (), and convert said alternating current into a voltage signal; filter groups () and vector voltmeters () which are mounted downstream from the current-to-voltage converters () and allow the complex signal ratio U/Uto be metrologically detected.

Growing community of inventors

Dresden, Germany

Uwe Hampel