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Commonly an artificial magnetic shield is used to improve antenna radiation in the far-field region, thanks to the in-phase reflection of electromagnetic waves. Here the authors study the possibility of constructive field interference with respect to the $n\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}a\phantom{\rule{0}{0ex}}r\ensuremath{-}f\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}e\phantom{\rule{0}{0ex}}l\phantom{\rule{0}{0ex}}d$ region. This effect is useful in magnetic resonance imaging, where a conductive scanned sample (such as a patient) is located in the near-field region of radio-frequency coils. The team combines the most popular type of rf coil in magnetic resonance imaging, the ``birdcage'', with an artificial magnetic shield, and demonstrate the near-field efficiency improvement, even at relatively low MRI frequencies.

Constructive Near-Field Interference Effect in a Birdcage MRI Coil with an Artificial Magnetic Shield