Patent ID: 8457916

Claim:
A method of calibrating an imaging system, the method comprising: a first measuring step of measuring magnetic induction signals associated with a reference object placed in a measurement chamber of the imaging system, to obtain a first set of measurement data; a step of calculating a first set of parameters based on the first set of measurement data and a set of offset data, the first set of parameter representing an electromagnetic property of the reference object and the set of offset data being an initial estimation of the offset of the system; a second measuring step of measuring magnetic induction signals associated with the reference object and an object of interest placed in the measurement chamber ( 100 ), to obtain a second set of measurement data; a step of calculating a second set of parameters based on the second set of measurement data and the set of offset data, the second set of parameters representing the electromagnetic property of the reference object and the object of interest; a step of deriving a third set of parameters from the second set of parameters based on the shape and/or position of the reference object in the measurement chamber, the third set of parameters representing the electromagnetic property of the reference object; and a step of deriving an optimal set of offset data from the first and third set of parameters, the optimal set of offset data being an estimation of the offset of the system; and a step of updating the set of offset data with the optimal set of offset data.