SYSTEM FOR SPATIALLY ADJUSTABLE EXCITATION OF LEADLESS MINIATURE MARKER

摘要

A system (10) for generating a magnetic field for excitation of a leadless marker assembly (14) includes a source generator (18) that generates a plurality of alternating electrical signals each having an independently adjustable phase. A plurality of excitation coils (46) are configured to simultaneously receive a respective one of the alternating electrical signals at a selected phase to generate a magnetic field. The phase of the alternating electrical signal for each excitation coil is independently adjustable (206) relative to the phase of the alternating electrical signal for the other excitation coils. The magnetic fields from the excitation coils combine to form a spatially adjustable excitation field (20, 220) for excitation of the remote leadless marker assembly.