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Published on: July 12, 2012
Biological applications of manganese-enhanced magnetic resonance imaging
1Department of Molecular Physiology and Biophysics, Baylor College of Medicine, Houston, TX, USA.
Abstract:
The manganese ion (Mn2+) has long been used in biomedical research as an indicator of calcium (Ca2+) influx in conjunction with fluorescent microscopy because it is well established that Mn2+ enters cells through voltage-gated Ca2+ channels. Mn2+ is also paramagnetic, resulting in a shortening of the spin-lattice relaxation time constant, T1, which yields positive contrast enhancement in T1-weighted magnetic resonance imaging (MRI), specific to tissues in which the ion has accumulated. Manganese-enhanced MRI (MEMRI) uses a combination of these properties of Mn2+ to elucidate anatomical information and to identify regions of cellular activity. The focus of this chapter will detail some of the current MEMRI methodologies and biological applications.
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