Appeal No. 2005-2572
Application No. 10/268,809
relate to one another as shown in Figure 1 and described at
column 3, line 52, through column 4, line 20.
Lüdeke teaches that the MR apparatus can be used with a
medical instrument 10 such as a catheter. The instrument
includes a microcoil 11 and a capacitor 19 which together form a
resonant circuit 20 tuned to the Larmor frequency of the tissue
being examined, and a modulation unit 12 which is controlled by a
remote unit 13. These elements permit the position of the
instrument to be determined by the MR apparatus. As described by
Lüdeke,
the signal induced into the coil system is
modulated, after RF excitation of the part of
the object to be examined which is present in
an examination zone, and emitted again with
this modulated frequency and/or phase. Using
a receiving coil system which forms part of
the MR device, the (modulated) coil signal
transmitted by the coil system as well as an
object signal from the excited zone of the
object to be examined are received as an MR
signal. Because these signals have different
frequencies and/or phases, the coil signal
and the object signal can be simply
separated, so that the determination of the
position of the coil system, and hence of the
position of the medical instrument, is also
simply possible [column 2, lines 2-14].
In applying Lüdeke against the appealed claims, the examiner
relies on the resonant circuit and modulation unit embodiment
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