Vorrichtung zur Erzeugung von in einem Magnetresonanz-Subtraktionsbild sichtbaren Markierungen

摘要

A stereotactic auxiliary attachment for magnetic resonance examinations has an antenna arrangement for receiving magnetic resonance signals from an examination space, a holder for fixing an examination subject in the examination space and a marker arrangement in the detection region of the antenna arrangement having at least one chamber for containing a substance to provide a reference for localizing an object of interest in the examination subject. The at least one chamber is connected via lines to a refilling device. The refilling device is provided for filling the at least one chamber with a first substance or second substance, the two substances having different magnetic resonance behavior. The chamber is filled with one substance for production of a first MR tomogram, and this substance is then removed from the chamber and replaced with the second substance for producing a second MR tomogram. Since the substances have different magnetic resonance behavior, the marks in the first and second tomograms remain visible when a subtraction image is produced from those tomograms, so the localization information is not lost.