Appeal No. 2005-2572
Application No. 10/268,809
optical signal lead via which a light signal is applied to the RF arrangement”
(specification, page 1). Representative claims 1, 4, 14 and 18 read as follows:
1. An MR apparatus comprising:
a medical instrument;
an RF arrangement disposed on the medical instrument, the RF arrangement
comprising:
at least one microcoil; and
a capacitor connected to the microcoil so ms to form a resonant circuit;
an optical signal lead via which a light signal is applied to the RF arrangement;
a modulator for modulating the light signal applied to the RF arrangement; and
an optoelectrical converter for converting the modulated light signal into an
electrical signal, the optoelectrical converter being coupled to the resonant circuit in
such a
manner that the resonant circuit is triggered by the electrical signal from the
optoelectrical converter so as to emit an RF field.
4. A method of localizing a medical instrument in an examination volume of an
MR apparatus having an RF frequency, the method comprising:
generating a light signal;
coupling the light signal along an optical signal lead to a optoelectrical converter;
converting the light signal to a photocurrent using the optoelectrical converter;
and
emitting an RF field in the vicinity of the medical instrument in response to the
photocurrent using a resonant circuit disposed on the medical instrument.
14. A medical instrument having a length and a distal end, the medical
instrument for use in a magnetic resonance system and comprising:
a coil disposed at the distal end of the medical instrument;
a capacitor in electrical connection with the coil, the coil and capacitor forming a
resonant circuit; and
an optoelectrical converter in electrical connection with the resonant circuit, the
optoelectrical converter for receiving a light signal from a signal lead, the signal lead
disposed along the length of the medical instrument and for converting the light signal to
a photocurrent which triggers resonance in the resonance circuit.
18. A magnetic resonance apparatus comprising:
a main field coil for generating a generally steady, uniform magnetic field in an
examination region;
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