| 摘要 |
<p>A system for using magnetic resonance to track a medical device, including an MR tracking device comprising one or more radiofrequency (RF) tracking coils adapted to receive a magnetic resonance MR response signal from nuclei excited by an RF pulse, the tracking device being attached to a medical device, wherein a dephasing gradient is applied perpendicular to the readout gradient before the RF response signal is received, thereby dephasing and attenuating any interfering signal emanating from remote nuclei, while the MR response signal is substantially unaffected. The system can also detect errors in tracking location by checking the amplitude of the signal from each coil and the detected distance between each coil, and correcting for such errors by ignoring data from coils having low amplitude or location deviating from known location relative to the other coils.</p> |
