Abstract: A method and system for measuring the effective diffusion tensor for spin labeled particles, and generating images therefrom. The effective diffusion tensor is related to the echo intensity in an NMR spin-echo experiment. This relationship is used to design experiments from which the diffusion tensor components are estimated. Estimation of Deff provides the theoretical basis for a new MRI modality, diffusion tensor imaging. Diffusion ellipsoids may be used for generating images representative of physical characteristics of the observed object. Scalar invariants of the diffusion tensor are also used for imaging.

Abstract: For sensing gaseous hydrocarbons in a gas mixture, a device consisting of two sensitive elements, one being a reference element, which are heated to different temperatures. The sensors, formed by subjecting films deposited by silk-screen processes to heat treatment at high temperature, are connected to an electronic evaluation circuit.

Abstract: A motion imaging method uses magnetic resonance to detect velocity, and an acceleration distribution within moving materials in a subject. Velocity encoding is performed by computing differences of data obtained with modulated motion-encoding magnetic field gradient pulses. Distributions of acceleration are measured responsive to a motion sensitive phase-encoding gradient pulse.

Abstract: A resonator for use in a magnetic resonance imaging apparatus for transmitting and receiving high frequency signals is formed by a combination of two antenna sub-systems, which generate respective magnetic fields which are perpendicular to each other, with the currents in the sub-system being phase-shifted by 90.degree. relative to each other, and each sub-system includes a capacitance which defines the resonant frequency. Each of the sub-systems forms a current loop, the current loops containing a common current network and a common base plate, which serves as a return path for both current loops. The junctions of the current network are connected via the resonant capacitances to the base plate, which consists of electrically conductive material. A circularly polarizing resonator is achieved for the transversal, fundamental field of the imaging apparatus, with the resonator also being capable of use as a surface resonator if the spacing between the current network and the base plate is small.