U.S. Philips Corporation

Ingwer C Carlsen

Michael Grass

Volker Rasche

Johannes J Van Vaals

Andrew G Stove

Joachim Schmidt

Jens D Jensen

Thomas Wendler

Heino Svensson

Karl-Juergan Moennich

Ruediger Grewer

A projection display system comprises a presentation computer (,) which generates images which are projected onto a screen (,) using a projector (,) controlled over a line (,) by the computer (,). A video camera (,) views the screen and a laser pointer (,) is supplied for pointing at the screen (,). An interaction computer (,) analyses the signal produced by the video camera (,) to determine the position of peak value in a frame to locate the point at which the laser pointer (,) is pointed. The laser pointer (,) is provided with buttons (,) which perform conventional computer mouse button functions. The state of the buttons (,) may be signalled to the computer (,) over an infra red link (,).

Projection display system

The invention relates to an image processing method for improving the signal-to-noise ratio for a series of MR images or CT images which are based on the projection-reconstruction method. First the pixels which reproduce the same sub-structure in the projection images are determined in the one-dimensional projection images constituting the two-dimensional MR or CT images. The image values of these pixels are subjected to noise filtering. Two-dimensional MR images or CT images are reconstructed from the noise filtered one-dimensional projection images.

Diagnostic image processing method

An MR method is presented for determining the nuclear magnetization distribution in an examination zone, the image data acquired during an MR examination by means of a surface coil arrangement, comprising at least one coil and exhibiting a locally inhomogeneous sensitivity, being corrected on the basis of auxiliary values derived from data acquired by means of a body coil arrangement having a locally at least approximately homogeneous sensitivity. Improved reconstruction is achieved in that, in addition to the MR examination, a respective MR auxiliary measurement is performed by means of the surface coil arrangement as well as by means of the body coil arrangement, that the two MR auxiliary measurements are carried out temporally separated from one another and from the MR examination, that during the two MR auxiliary measurements the magnetic fields acting on the examination zone exhibit the same variation in time, and that the auxiliary values are derived from the data acquired during the two MR auxiliary measurements.

Method for reducing inhomogeneity of surface coils through additional

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Kiel, Germany

Ingwer C Carlsen