AI Article Synopsis
- In high-field magnetic resonance imaging (MRI), metals can distort images due to differences in magnetic susceptibility and radiofrequency field modifications.
- Nuclear magnetic resonance (NMR) spectroscopy and MRI cannot be performed with samples in metal containers.
- A microtesla imaging system operating at 2.8 kHz successfully provided distortion-free images of a titanium bar and a 3D object within an aluminum can, demonstrating a solution to metal-related imaging issues at high fields.
Article Abstract
In magnetic resonance imaging performed at fields of 1 T and above, the presence of a metal insert can distort the image because of susceptibility differences within the sample and modification of the radiofrequency fields by screening currents. Furthermore, it is not feasible to perform nuclear magnetic resonance (NMR) spectroscopy or acquire a magnetic resonance image if the sample is enclosed in a metal container. Both problems can be overcome by substantially lowering the NMR frequency. Using a microtesla imaging system operating at 2.8 kHz, with a superconducting quantum interference device as the signal detector, we have obtained distortion-free images of a phantom containing a titanium bar and three-dimensional images of an object enclosed in an aluminum can; in both cases high-field images are inaccessible.
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| http://dx.doi.org/10.1016/j.jmr.2005.11.005 | DOI Listing |
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