Patent ID: 7974680
Filing Date: 2011-07-05
Classification: A61B

Abstract:
1. Assessment apparatus for determining a fingerprint signal of an interfering article in an energy field for a medical procedure, comprising: a set of one or more radiators, which is adapted to generate an energy field at at least one fundamental frequency; a receiving sensor, which is adapted to generate a first signal responsive to the energy field when an interfering article is at a first location relative to the receiving sensor, the first location being in a vicinity of the receiving sensor, the first signal defining a distorted signal, the receiving sensor being adapted to generate a second signal responsive to the energy field when the interfering article is at a second location relative to the receiving sensor, the second location not being in a vicinity of the receiving sensor such that the interfering article has substantially no effect on the second signal, the second signal defining a clean signal; and a control unit, which is adapted to: