Magnetosomen als biologisches Modell der Eisenbindung: Messung der Relaxivitaet in der MRT

Item Type:	Article
Title:	Magnetosomen als biologisches Modell der Eisenbindung: Messung der Relaxivitaet in der MRT
Creators Name:	Herborn, C.U. and Papanikolaou, N. and Reszka, R. and Gruenberg, K. and Schueler, D. and Debatin, J.F.
Abstract:	Purpose: In vitro characterization of iron-containing bacterial particles (magnetosomes) as superparamagnetic contrast agents for MRI. Material and Methods: Different concentrations of magnetosomes were examined with a 1.5 T clinical whole-body MR system at 21°C using the transit/receive extremity coil. Both longitudinal and transversal relaxivities (R1 and R2) of the magnetosomes were determined by an inversion recovery snapshot gradient recall echo (1R FLASH) with various inversion times and a multi echo spin echo sequence. Atomic absorption spectrometry (AAS) and electron microscopy were used as reference standard. Results: Longitudinal and transverse relaxivities of the magnetosomes were calculated to be R1 = 7.688 mmol-1 s-1 and R2 = 147.67 mmol-1 s-1, respectively. The corresponding iron concentrations were determined in all dilutions using AAS, while the magnetosomes were morphologically delineated by electron microscopy. Conclusion: Magnetosomes represent a new and interesting class of iron-containing contrast agents warranting further evaluation in cellular cultures and animal models. Magnetosomes may be suited for displaying the vector distribution and gene expression of new molecular therapies.
Keywords:	MRI, Contrast Agents, Magnetosomes, Experimental Radiology
Source:	RoFo Fortschritte auf dem Gebiete der Roentgenstrahlen und der neuen bildgebenden Verfahren
ISSN:	1438-9029
Publisher:	Thieme
Volume:	175
Number:	6
Page Range:	830-834
Date:	June 2003
Official Publication:	https://doi.org/10.1055/s-2003-39918
PubMed:	View item in PubMed

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