Abstract: A nuclear magnetic resonance (NMR) imaging method in which, with the aid of a gradient system, a spatially and temporally variable magnetic field Bgrad is generated, for the at least two-dimensional spatial encoding of NMR measurement signals in a measurement sample region to be imaged, where the magnetic field Bgrad is employed in at least two forms Bgrad1 and Bgrad2 in the measurement sample region to be imaged during a single measurement cycle from excitation to reading of the NMR measurement signals, where the first form Bgrad1 has essentially ns poles, where ns is an even number > 2, and has ns essentially sectorial sub-regions, in each of which the magnetic field Bgrad is locally monotonic in one direction, where the measurement signals from the measurement sample are recorded by means of at least ns receiver coils which have different sensitivity over the ns sub-regions of the region to be imaged, is characterized in that the second form Bgrad2 is essentially identical to the first form Bgrad1 % wit

Abstract: The pursuit for ever higher field strengths and faster data acquisitions has led to the construction of coil arrays with high numbers of elements. With the SENSE technique it has been shown, how the sensitivity of those elements can be used for spatial image encoding. A method in accordance with the present invention, largely abstains from using encoding gradients. The resulting sensitivity encoded free induction decay (FID) data is then not used for imaging, but for determining field inhomogeneity distribution. The method has therefore been termed SSH for Sense SHimming.

Abstract: A magnetic resonance method for using radio frequency pulses for spatially selective and frequency selective or multidimensionally spatially selective excitation of an ensemble of nuclear spins with an initial distribution of magnetization in a main magnetic field aligned along a z-axis, wherein a spin magnetization with a given target distribution of magnetization is generated, and for refocusing the spin magnetization, is characterized in that the radio frequency pulse is used as a sequence of sub-pulses of independent duration, courses of gradients and spatial and/or spectral resolution, comprising one or more large angle RF pulses with tip angles greater than or approximately equal to 15°, which generate a gross distribution of magnetization approximating the target distribution of magnetization or a desired modification of the distribution of magnetization with a mean deviation less than or approximately equal to 15°, wherein the actual effect of the LAPs on the distribution of spin magnetization before

Abstract: A nuclear magnetic resonance (NMR) imaging method in which, with the aid of a gradient system, a spatially and temporally variable magnetic field Bgrad is generated, for the at least two-dimensional spatial encoding of NMR measurement signals in a measurement sample region to be imaged, where the magnetic field Bgrad is employed in at least two forms Bgrad1 and Bgrad2 in the measurement sample region to be imaged during a single measurement cycle from excitation to reading of the NMR measurement signals, where the first form Bgrad1 has essentially ns poles, where ns is an even number ?2, and has ns essentially sectorial sub-regions, in each of which the magnetic field Bgrad is locally monotonic in one direction, where the measurement signals from the measurement sample are recorded by means of at least ns receiver coils which have different sensitivity over the ns sub-regions of the region to be imaged, is characterized in that the second form Bgrad2 is essentially identical to the first form Bgrad1, with

Abstract: An object is examined by detecting properties of the object at different times within a space formed by spatial frequencies. This is done such that temporally consecutive recordings are made in overlapping regions of the spatial frequency space and also in regions of the spatial frequency space that differ from one another.

Abstract: The invention relates to a method for examining at least one object during which properties of the object are detected at different times within a spatial frequency space formed by spatial frequencies. According to the invention, the method is carried out in such a manner that temporally consecutive recordings ensue in overlapping regions of the spatial frequency space and additionally in regions of the spatial frequency space that differ from one another.

Abstract: A magnetic resonance (NMR) method for fast, dynamic, spatially resolved measurement of the temporal changes in NMR signals by means of repeated data acquisition in individual measurements (Acq) with measuring sequences which are sensitive to a parameter to be observed, in an NMR apparatus with shim coils for correcting the magnetic field is characterized in that during data acquisition of each individual measurement (Acq) in acquisition steps (S1 . . . Sn) with a time lag, the magnetic field distribution in the NMR apparatus is measured, technically or physiologically based changes in the magnetic field distribution are determined therefrom in a calculation step (Scalc) as well as a change in the currents in the magnetic field required for compensation thereof, and the dynamic changes in the magnetic field distribution are compensated for by means of the correspondingly changed shim currents.

Abstract: The invention relates to a pulse train, to a nuclear magnetic resonance scanner, which comprises means for generating this pulse train, and to an imaging method in which the pulse train according to the invention is used. The pulse train according to the invention comprises an &agr; high-frequency pulse, a preceding 180° pulse or a preceding 180° and a 90° pulse that precedes the 180° pulse, as well as a slice selection and a k-space line coding as well as an acquisition module, which is subsequent thereto for purposes of generating data. This invention is characterized in that the acquisition module for generating data results from at least two slices. By means of the pulse train and imaging method according to the invention, 20 slices of an image can be acquired at 16 different points in time for a matrix size measuring 256×256 during a measuring time of 8 minutes and 28 seconds. As a result, T1 relaxation times can be used for the first time for imaging methods in medical diagnosis.

Abstract: The invention relates to a pulse train, to a nuclear magnetic resonance scanner, which comprises means for generating this pulse train, and to an imaging method in which the pulse train according to the invention is used. The pulse train according to the invention comprises an a high-frequency pulse, a preceding 180° pulse or a preceding 180° and a 90° pulse that precedes the 180° pulse, as well as a slice selection and a k-space line coding as well as an acquisition module, which is subsequent thereto for purposes of generating data. This invention is characterized in that the acquisition module for generating data results from at least two slices. By means of the pulse train and imaging method according to the invention, 20 slices of an image can be acquired at 16 different points in time for a matrix size measuring 256×256 during a measuring time of 8 minutes and 28 seconds. As a result, T1 relaxation times can be used for the first time for imaging methods in medical diagnosis.

Abstract: The invention relates to an imaging method for examining substances, wherein a precession of at least one nuclear spin having an additional phase angle &Dgr;&phgr;=−&ggr;r&Dgr;Bz&tgr; relative to an already existing precession is generated by indirect nuclear spin-nuclear spin interaction in an external magnetic field with the purpose of spreading perpendicular magnetization vertical to the magnetic field so that relaxation of perpendicular magnetization occurs within a relaxation time T2*. According to the invention, the method is characterized in that the relaxation is recorded in the form of at least one high resolution image directly after the excitation pulse using echo-planar-imaging and in that more images are recorded at lower resolution thereafter.