Abstract: A probe (303; 403) for sensing a magnetic marker, comprising a first set of coils (313; 413), which comprises a first coil of a first coil type, e.g. a sense coil (305; 405), disposed between a first pair of coils of second coil type, e.g. drive coils (301a, 301b; 401a, 401b), that are connected in series, and a balancing element (317; 417) which is axially separated from the first set of coils (313; 413) along a length of the probe (303; 403). The balancing element (317; 417) is configured and arranged to generate a sense voltage that wholly offsets, partially offsets, or minimises, a sense voltage induced in the sense coil or coils (305; 405) of the first set of coils from the drive coils or coil (301a, 301b; 401a, 401b).

Abstract: A magnetic field generator. In one embodiment, the magnetic field generator includes a drive circuit including a MOSFET gate driver having an output terminal; a drive capacitor having a first and second terminal, a tank circuit including a tank circuit capacitor having a first and second terminal and a field-producing coil having a first and second terminal, wherein the first terminal of the tank circuit capacitor and the first terminal of the field-producing coil comprise the first terminal of the tank circuit, wherein the second terminal of the tank circuit capacitor and the second terminal of the field-producing coil comprise the second terminal of the tank circuit, wherein the first terminal of the drive capacitor is in electrical communication with the output terminal of the MOSFET gate driver, and wherein the second terminal of the drive capacitor is in electrical communication with the first terminal of the tank circuit.

Abstract: A method of processing optical coherence tomography (OCT) scans of a subject's skin (7), the skin (7) having a surface (8), the method comprising capturing a plurality of scans through the subject's skin (7), the scans representing an OCT signal in slices through the user's skin (7) in parallel planes, the scans being offset from one another along a direction perpendicular to the parallel planes, the method comprising determining the position of the surface (8) of the skin (7) in each scan and displaying the scans to a user with an indication (9) indicative of a predetermined depth below the surface (8) of the skin (7) visible to the user.

Abstract: A magnetic field generator. In one embodiment, the magnetic field generator includes a drive circuit including a MOSFET gate driver having an output terminal; a drive capacitor having a first and second terminal, a tank circuit including a tank circuit capacitor having a first and second terminal and a field-producing coil having a first and second terminal, wherein the first terminal of the tank circuit capacitor and the first terminal of the field-producing coil comprise the first terminal of the tank circuit, wherein the second terminal of the tank circuit capacitor and the second terminal of the field-producing coil comprise the second terminal of the tank circuit, wherein the first terminal of the drive capacitor is in electrical communication with the output terminal of the MOSFET gate driver, and wherein the second terminal of the drive capacitor is in electrical communication with the first terminal of the tank circuit.

Abstract: A method of processing optical coherence tomography (OCT) scans of a subject's skin (7), the skin (7) having a surface (8), the method comprising capturing a plurality of scans through the subject's skin (7), the scans representing an OCT signal in slices through the user's skin (7) in parallel planes, the scans being offset from one another along a direction perpendicular to the parallel planes, the method comprising determining the position of the surface (8) of the skin (7) in each scan and displaying the scans to a user with an indication (9) indicative of a predetermined depth below the surface (8) of the skin (7) visible to the user.

Abstract: A method and apparatus for measuring the change in temperature of a material being heated. In one embodiment, the method includes introducing particles having magnetic susceptibility into the material; heating the material and particles; measuring, using a circuit having a resonant frequency, the change in the resonant frequency of the circuit as the temperature of the particles changes; and correlating the change in resonant frequency to a change in temperature. In one embodiment, the apparatus includes a collection of magnetic particles in contact with the material undergoing heating; a resonance circuit including a tank circuit including a coil and capacitance and having a resonant frequency; an alternating current variable frequency source capable of tracking changes in the resonant frequency of the tank circuit to maintain the frequency of the alternating current at the resonant frequency of the tank circuit; and a processor in communication with the alternating current source.