Conventional methods of detecting these objects using passive markers are too imprecise - not least because of image artefacts. Therefore, there have been attempts to mark instruments with resonant circuits. These approaches work satisfactorily under idealised laboratory conditions. However, this is not the case in practice, since electrically conductive body fluids greatly impair the quality of the resonant circuits and therefore the intensity of the MRT image signal. This applies in particular to moving fluids such as blood, which additionally blur the marker signal because of their turbulence.
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