Patent ID: 7671591

Claim:
A method, comprising: (a) placing a first micro-electronic device in a sample chamber of a magnetic resonance imaging machine, subjecting said first micro-electronic device to a static magnetic field and a radio frequency pulse, turning off or adjusting said static magnetic field and then detecting a first returned RF pulse from said first micro-electronic device and storing first data relating to said first returned RF pulse; after (a), (b) placing a second micro-electronic device in said sample chamber of said magnetic resonance imaging machine, subjecting said second micro-electronic device to said static magnetic field and said radio frequency pulse, turning off or adjusting said static magnetic field and then detecting a second returned RF pulse from said second micro-electronic device and storing second data relating to said second returned RF pulse; and (c) comparing said first data to said second data and determining if said second micro-electronic device is essentially identical to said first micro-electronic device based on said comparing.