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Abstract

The present invention relates to specific complexes comprising heavy metal ions having an atomic number of 29 or higher and 83 or lower (preferably 29 or higher and 81 or lower) and one or more ligand(s) selected from the group consisting of specific xanthene derivatives, preferably eosin Y and/or erythrosin B ligand(s). In particular, the invention relates to the use of the complexes as ex vivo contrast agents for a computed tomography scanning of a biological sample. Moreover, the invention relates to specific ex vivo methods for investigating a biological sample by means of computed tomography scanning methods, wherein the method comprises staining the biological sample with a solution comprising one or more of the complex(es); or wherein the method comprises staining the biological sample with a staining solution comprising one or more specific xanthenes derivatives (e.g. eosin Y and/or erythrosin B), and separately contacting the biological sample with one or more staining solution(s) comprising one or more heavy metal ions having an atomic number of 29 or higher and 83 or lower (preferably 29 or higher and 81 or lower).

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First Claim