Title :
High-Precision Absolute Positioning of Medical Instruments in MRI Systems
Author :
Aboussouan, Eric ; Martel, Sylvain
Author_Institution :
Dept. of Comput. Eng., Ecole Polytech. de Montreal, Que.
fDate :
Aug. 30 2006-Sept. 3 2006
Abstract :
An absolute positioning technique has been developed for ferromagnetic markers in medical instruments and untethered devices operating in a magnetic resonance imaging (MRI) system. This technique allows high precision 3D readings of the location of the device with respect to the absolute center of the MRI bore. The local magnetic field induced by the device is used as a signature for localization from 3 one-dimensional projections. A convolution between two acquisitions based on opposite read-out gradients is used to obtain the absolute position of the device without any effect from the susceptibility distortion. The validity of the method has been demonstrated and its precision was found sufficient to correctly register the device position with MRI images
Keywords :
biomedical MRI; biomedical equipment; image registration; medical image processing; MRI system; absolute positioning technique; ferromagnetic marker; magnetic resonance imaging system; medical instruments; susceptibility distortion; untethered device; Biomedical engineering; Biomedical imaging; Boring; Imaging phantoms; Instruments; Magnetic devices; Magnetic fields; Magnetic resonance imaging; Radio frequency; Saturation magnetization; Convolution; MRI; absolute positioning; ferromagnetic tracking; microdevice;
Conference_Titel :
Engineering in Medicine and Biology Society, 2006. EMBS '06. 28th Annual International Conference of the IEEE
Conference_Location :
New York, NY
Print_ISBN :
1-4244-0032-5
Electronic_ISBN :
1557-170X
DOI :
10.1109/IEMBS.2006.259265
