Abstract: An optimized multislice data acquisition method and apparatus for magnetic resonance imaging is disclosed. In this new method, instead of forming a set of multislice image sequences in series for a given phase encoding step, initiation sequences corresponding to different slices are interwoven with acquisition sequences in an optimal way depending on the desired initiation sequence time. A number of acquisition and initiation sequences are inserted with different slice combinations, between the initiation sequence and acquisition sequence, i.e., long initiation sequence time is effectively utilized for the other slice data acquisition. With this optimized method, imaging time can be reduced by as much as a factor of four compared to existing methods.

Abstract: Spatial localization of NMR signals is obtained by applying a selective 90.degree. RF pulse concurrently with a second order non-linear magnetic field gradient of the form x.sup.2 +y.sup.2 -2z.sup.2, and then applying a selective 180.degree. RF pulse concurrently with a linear magnetic field gradient in the z direction. The resulting spin-echo signal may be analyzed to perform volume-selected magnetic resonance spectroscopy. Spatially localized two-dimensional or three-dimensional magnetic resonance imaging may be accomplished using this spatial localization sequence together with an appropriate Fourier imaging sequence. Likewise, spatially localized one-dimensional, two-dimensional or three-dimensional chemical shift imaging may be obtained by applying one or more stepped phase encoding linear magnetic field gradients along the x, y and/or z directions.

Abstract: Percutaneous emboli are formed for therapeutic and/or corrective reasons by using a composition which includes crosslinked gells of hyaluronic acid (HA), hylan (HY) or mixed crosslinked gels of HA or HY with other materials, thrombin and cationic substances containing quaternary ammonium groups. Other optional materials include fillers and radio-opaque substances.

Abstract: Measurement of magnetic field distributions is performed using a method based on the nuclear magnetic resonance (NMR) technique of Pourier imaging. By selecting objects which limit the spatial distribution of the NMR observable nuclei, images can be obtained which allow easy interpretation of the magnetic field distribution and facilitate rapid shimming of magnets. A method for providing a convenient display of field data is provided, as well as chemical shift imaging with correction for static field inhomogeneity. Results from these field plots are used as corrections for static field inhomogeniety when obtaining a chemical shift image. A method for localized spectral analysis from the chemical shift image is also provided.

Abstract: This invention provides a rotating superconductor magnet for producing a rotating lobed magnetic field, comprising a cryostat; a superconducting magnet in the cryostat having a collar for producing a lobed magnetic field having oppositely directed adjacent field lines; rotatable support means for selectively rotating the superconductor magnet; and means for energizing the superconductor magnet.