Abstract: The invention relates to a method to determine the spatial distribution of magnetic particles in an examination area of an object of examination with the following steps: a) Generation of a magnetic field with a spatial distribution of the magnetic field strength such that the examination area consists of a first sub-area with lower magnetic field strength and a second sub-area with a higher magnetic field strength, b) Change of the particularly relative spatial position of the two subareas in the area of examination or change of the magnetic field strength in the first sub-area so that the magnetization of the particles changes locally, c) Acquisition of signals that depend on the magnetization in the area of examination influenced by this change, and d) Evaluation of signals to obtain information about the change in spatial distribution and/or the movement of the magnetic particles in the area of examination, where the magnetic particles are introduced into and/or are present in the area of examination in a

Abstract: The invention relates to a method and an apparatus for influencing magnetic particles in a region of action. With the help of an arrangement that has means for generating magnetic fields, a spatially inhomogeneous magnetic field is generated that has at least one zone (301) in which the magnetization of the particles is in a state of non-saturation, whereas it is in a state of saturation in the remaining zone. By displacing the said zone within the region of action, a change in magnetization is produced that can be detected from outside and that gives information on the spatial distribution of the magnetic particles in the region of action. Alternatively, the displacement may also be repeated so frequently that the region of action heats up. To improve the accessibility of the region of action, the said region is situated outside the arrangement having means for generating magnetic fields.

Abstract: The present invention relates to a method for improved spatially resolved determination of magnetic particle distribution in an area of examination, where the changes in spatial distribution, the concentration and/or the anisotropy of these magnetic particles in the area of examination are monitored. The invention further also relates to magnetic particle compositions having improved magnetic imaging properties for use in the method according to the invention. The present invention further also relates to a method and an apparatus having improved spatial resolution in the method according to the invention by application of a high frequency field to increase the spin temperature of the spin systems of the magnetic particles.

Abstract: The present invention relates to a device for determining mechanical, particularly elastic, parameters of an examination object, comprising a) at least one arrangement for determining the spatial distribution of magnetic particles in at least one examination area of the examination object, comprising a means for generating a magnetic field with a spatial profile of the magnetic field strength such that there is produced in at least one examination area a first part-area having a low magnetic field strength and a second part-area having a higher magnetic field strength, a means for detecting signals which depend on the magnetization in the examination object, particularly in the examination area, that is influenced by a spatial change in the particles, and a means for evaluating the signals so as to obtain information about the, in particular temporally changing, spatial distribution of the magnetic particles in the examination area; and b) at least one means for generating mechanical displacements, in particu

Abstract: A coil system (210) for an apparatus operating in conformity with the spin resonance or magnetic resonance (MR) method encloses an examination space (217) which extends along an axis (218) and is intended to receive a patient (215). It includes an inner RF coil (219), an inner sub-coil (213?) which externally encloses the RF coil (219) and projects beyond the RF coil (219) in the axial direction at both sides, and an active shield (212) which externally encloses the inner sub-coil (213?) and constitutes a gradient coil arrangement in conjunction with the inner sub-coil (213?). For specified gradients, the energy required for the gradient coil arrangement (213?, 212) in such a coil system is reduced in that the volume occupied by the inner sub-coil (213?) is extended in the axial direction by way of regions extending beyond the RF coil (219) in the direction of the axis (218).

Abstract: A coil system (210) for an apparatus operating in conformity with the spin resonance or magnetic resonance (MR) method encloses an examination space (217) which extends along an axis (218) and is intended to receive a patient (215). It includes an inner RF coil (219), an inner sub-coil (213?) which externally encloses the RF coil (219) and projects beyond the RF coil (219) in the axial direction at both sides, and an active shield (212) which externally encloses the inner sub-coil (213?) and constitutes a gradient coil arrangement in conjunction with the inner sub-coil (213?). For specified gradients, the energy required for the gradient coil arrangement (213?, 212) in such a coil system is reduced in that the volume occupied by the inner sub-coil (213?) is extended in the axial direction by way of regions extending beyond the RF coil (219) in the direction of the axis (218).