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1. (WO2007007217) AN APPARATUS, A SYSTEM AND A METHOD FOR ENABLING AN IMPEDANCE MEASUREMENT
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CLAIMS:

1. An electromagnetic impedance measurement apparatus (1) comprising a sensor element (3a) for enabling an impedance measurement of an external substance, said apparatus further comprising a further sensor element (3b, 3c, 3d) for enabling a spatially resolved impedance measurement (Sl, S2, S3, S4) of said substance, said sensor element and said further sensor element being arranged as parts of respective resonant circuits operating at different resonant frequencies.

2. An apparatus according to Claim 1, wherein the sensor element and the further sensor element are conceived to form an array (1) or a matrix (20) of sensor elements.

3. An apparatus according to Claim 1 or 2, wherein the sensor element and the further sensor element comprise respective sensor coils (3a, 3b, 3c, 3d) cooperating with respective capacitive elements (5a, 5b, 5c, 5d), the respective resonant frequencies being determined by pre-selected values of the respective capacitive elements (5a, 5b, 5c, 5d).

4. An apparatus according to Claim 1 or 2, wherein the sensor element and the further sensor element comprise respective sensor coils (3a, 3b, 3c, 3d) cooperating with respective capacitive elements (5a, 5b, 5c, 5d), the respective resonant frequencies being determined by respective lengths of connection tracks of the sensor element and the further sensor element (3a, 3b, 3c, 3d).

5. An apparatus according to any one of the preceding Claims, wherein the sensor element and the further sensor element are arranged in an immobilizing unit (40).

6. An apparatus according to any one of the preceding Claims, wherein the sensor element and the further sensor element are arranged in a wearable piece (30).

7. An apparatus according to any one of the preceding Claims, wherein the sensor element and the further sensor element comprise flexible material.

8. A vital sign measurement system (50) arranged to measure a signal representative of a vital sign of an individual, said system comprising the apparatus (51a) according to any one of the preceding Claims.

9. A method of enabling an impedance measurement of an external substance, said method comprising the steps of:
providing an apparatus comprising a sensor element and a further sensor element for enabling a spatially resolved impedance measurement of said substance, said sensor element and said further sensor element being arranged as parts of respective resonant circuits operating at different resonant frequencies;
positioning the apparatus in the vicinity of the substance;
applying alternating electromagnetic fields to the sensor element and the further sensor element;
detecting a signal representative of a variation of respective quality factors of said resonance circuits.