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The stability and safety of magnetic resonance imaging (MRI) contrast agents (CAs) are crucial for accurate diagnosis and real-time monitor of tumor development. Paramagnetic Mn as nonlanthanide metal ion has been widely studied for use in T-MRI CAs, but unfortunately, Mn can be oxidized by HO in tumor to nonparamagnetic Mn via a Fenton-like reaction. The concurrent loss of paramagnetism and production of toxic hydroxyl radical (OH) go against the basic requirment of CAs, thus restricting the further development of Mn-based CAs. Based on the different standard potential of W/W (~0.26 V) and Mn/Mn (~1.2 V), a "cathodic protection" strategy was exploited in Mn-doped NaWO nanorods (NaMnWO), with W as the sacrificial anode and Mn as the protected cathode, to protect Mn from oxidation in tumor for stable MR contrast performance, as well as repress its Fenton-like reaction activity for good biosafety. Moreover, the tungsten bronze crystal structure endows NaMnWO with excellent near-infrared (NIR)-photothermal properties for effective tumor hyperthermia, without effect from the changed oxidation state of W. This "cathodic protection" strategy offers a new method for the development of reliable and hypotoxic biomaterials for stable imaging and therapeutic applications in clinic.
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The use of molecularly targeted imaging probes to localize and/or monitor biochemical and cellular processes via various imaging modalities that include RADIONUCLIDE IMAGING; ULTRASONOGRAPHY; MAGNETIC RESONANCE IMAGING; fluorescence imaging; and MICROSCOPY.
A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance (ENDOR) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING.
Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei, protons or electrons. It is employed in clinical applications such as NMR Tomography (MAGNETIC RESONANCE IMAGING).
A type of MAGNETIC RESONANCE IMAGING that uses only one nuclear spin excitation per image and therefore can obtain images in a fraction of a second rather than the minutes required in traditional MRI techniques. It is used in a variety of medical and scientific applications.
The creation of a visual display of the inside of the entire body of a human or animal for the purposes of diagnostic evaluation. This is most commonly achieved by using MAGNETIC RESONANCE IMAGING; or POSITRON EMISSION TOMOGRAPHY.
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