| 摘要 |
An NMR tomograph, the magnet system 2 and gradient system of which permit access to the investigation volume along at least two essentially orthogonal axes, comprises a positioning system for the exact determination of the position of a manually guided manipulator 12, e.g. a biopsy needle, relative to the measuring object 6 which is investigated by means of imaging MR measurement and located in the investigation volume 3 of the NMR tomograph 1; with a mounting frame 11 with which the manipulator 12 is connected via movable mechanics comprising a measuring means through which the respective spatial position of the manipulator 12 relative to the mounting frame 11 can be determined, wherein the measuring means of the movable mechanics does not utilize any MR signals and wherein the measured position of the manipulator 12 is displayed on the MR image. At least one marking point 13 containing an MR measurable substance is provided on the mounting frame, such that the spatial position of the frame in the MR image can be determined via imaging MR measurement. |
