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- W4300481389 abstract "Based upon Maxwell's equations, it has long been established that oscillating electromagnetic (EM) fields incident upon a metal surface decay exponentially inside the conductor, leading to a virtual EM vacuum at sufficient depths. Magnetic resonance imaging (MRI) utilizes radiofrequency (r.f.) EM fields to produce images. Here we present the first visualization of an EM vacuum inside a bulk metal strip by MRI, amongst several novel findings. We uncover unexpected MRI intensity patterns arising from two orthogonal pairs of faces of a metal strip, and derive formulae for their intensity ratios. Further, we furnish chemical shift imaging (CSI) results that discriminate different faces (surfaces) of a metal block according to their distinct nuclear magnetic resonance (NMR) chemical shifts, which holds much promise for monitoring surface chemical reactions noninvasively. Bulk metals are ubiquitous, and MRI is a premier noninvasive diagnostic tool. Combining the two, the emerging field of bulk metal MRI can be expected to grow in importance. The fundamental nature of results presented here can impact and spur further development of bulk metal MRI and CSI across many fields." @default.
- W4300481389 created "2022-10-03" @default.
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- W4300481389 date "2016-10-12" @default.
- W4300481389 modified "2023-10-06" @default.
- W4300481389 title "Visualizing Electromagnetic Vacuum by MRI" @default.
- W4300481389 doi "https://doi.org/10.20944/preprints201610.0042.v1" @default.
- W4300481389 hasPublicationYear "2016" @default.
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