Abstract
The gadolinium ions which enhance the signals in MR images are very toxic, so in the contrast medium molecule they have to be strongly attached to a chelate to avoid adverse effects. The linear chelate molecules are open chains which can fold and unfold off the gadolinium ion with ease. In contrast, the macrocyclic chelate molecules are rigid rings of almost optimal size to cage the gadolinium ion. Experimental data, both in vitro and in vivo, and clinical observations, have confirmed the lower stability of the linear gadolinium-based molecules compared to the more stable macrocyclic agents.
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Morcos, S.K. (2014). Gadolinium Chelates and Stability. In: Thomsen, H., Webb, J. (eds) Contrast Media. Medical Radiology(). Springer, Berlin, Heidelberg. https://doi.org/10.1007/174_2013_895
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DOI: https://doi.org/10.1007/174_2013_895
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