Sample holder for use in NMR

A nuclear magnetic resonance (NMR) pressurizable sample holder configured for retaining a fluid sample during a performance of an NMR examination, comprising

• a pressure-retaining nonmagnetic tube formed of non-metallic electrically insulating matrix material which is reinforced with electrically conductive filaments that are configured and arranged within the non-metallic electrically insulating matrix material to directionally inhibit induced eddy currents by having less conductivity in a direction transverse to the reinforcing electrically conductive filaments than in a direction along a length of the reinforcing electrically conductive filaments;
• gradient coils that are spaced around the pressure retaining nonmagnetic tube, wherein the gradient coils are configured to be switched on and off during the performance of the NMR examination, and where the gradient coils generate the induced eddy currents that the reinforcing electrically conductive filaments are configured and arranged to directionally inhibit;
• the pressure-retaining nonmagnetic tube also being positioned to surround at least one radio-frequency coil, and the at least one radio-frequency coil being positioned to surround a space configured for retaining the fluid sample.