System and method for contactless power transfer in portable image detectors

A system for contactless power transfer in a portable image detector for charging a rechargeable battery disposed within the portable image detector comprising:

• a first coil couplable to a power source, wherein the first coil is configured to produce a magnetic field;
• a second coil coupled to the rechargeable battery disposed within the portable image detector and configured to receive power from the first coil via the magnetic field and to transfer the power to the rechargeable battery;
• and
• a field focusing element disposed between the first coil and the second coil and configured as a self resonant coil having a standing wave current distribution to focus the magnetic field onto the second coil and enhance the coupling between the first coil and the second coil, wherein the field focusing element comprises a plurality of resonators with at least two of the plurality of resonators having different resonant frequencies.