| 摘要 |
The invention relates to a system and a method for tracking position and orientation of an object in a magnetic resonance (MR) apparatus. The system comprises a tracking device for electromagnetic measurements of position and orientation with
a) a tracker structure (2) that is firmly attachable to the object (4) of which the position and orientation are to be measured;
b) retransmitter means (6;8a,8b,8c) firmly attached to said tracker structure, said retransmitter means having at least one retransmitter resonance frequency; and
c) electrical circuitry means including:
i) transmitter means (10) for transmitting an electromagnetic field with at least one of said retransmitter resonance frequencies;
ii) receiver means (12;14a,14b) for receiving an electromagnetic field retransmitted by said retransmitter means; said receiver means converting said electromagnetic field into a proportional voltage; and
iii) calculating means for determining, from said proportional voltages obtained from said receiver means, a position and orientation of said retransmitter means, and concomitantly of said object.
The tracking device can be used in an operating MR imaging or spectroscopy apparatus. |
