Abstract
Background
A method of real-time, accurate probe tracking at the entrance of the MRI bore is developed, which, fused with pre-procedural MR images, will enable clinicians to perform cryoablation efficiently in a large workspace with image guidance.
Methods
Electromagnetic (EM) tracking coupled with optical tracking is used to track the probe. EM tracking is achieved with an MRI-safe EM sensor working under the scanner's magnetic field to compensate the line-of-sight issue of optical tracking. Unscented Kalman filter-based probe tracking is developed to smooth the EM sensor measurements when occlusion occurs and to improve the tracking accuracy by fusing the measurements of two sensors.
Results
Experiments with a spine phantom show that the mean targeting errors using the EM sensor alone and using the proposed method are 2.21 mm and 1.80 mm, respectively.
Conclusion
The proposed method achieves more accurate probe tracking than using an EM sensor alone at the MRI scanner entrance.
from #MedicinebyAlexandrosSfakianakis via xlomafota13 on Inoreader http://ift.tt/2hYdDzk
via IFTTT
Δεν υπάρχουν σχόλια:
Δημοσίευση σχολίου