Title :
Microdevice´s susceptibility difference based MRI positioning system, a preliminary investigation
Author :
Felfoul, O. ; Martel, S. ; Beaudoin, G. ; Mathieu, J.B.
Author_Institution :
Dept.of Comput. Eng., Montreal Univ., Que., Canada
Abstract :
A positioning technique for an endovascular microdevice propelled by magnetic force inside a magnetic resonance imaging (MRI) system is being developed. Positioning options are presented and a magnetic positioning technique is described in more details. Since a magnetic positioning system is deeply dependent on the quality of the measurement modality, we describe the main magnetic field measurement techniques that can be used inside an MRI. Finally, we propose a magnetic positioning system using MRI phase images to measure the magnetic distortion induced by the ferromagnetic body. Positioning results on a 1010/1020 carbon steel, 1.5875 mm diameter sphere with gradient echo phase images are presented.
Keywords :
biomedical MRI; cardiovascular system; magnetic susceptibility; surgery; 1.5875 mm; MRI positioning technique; carbon steel; endovascular microdevice; ferromagnetic body; gradient echo phase image; magnetic distortion measurement; magnetic field measurement techniques; magnetic resonance imaging system; susceptibility; Cardiovascular system; Distortion measurement; Magnetic field measurement; Magnetic resonance imaging; Minimally invasive surgery; Nonlinear distortion; Position measurement; Propulsion; Signal resolution; Ultrasonic imaging; Field mapping; MRI; micro-device; phase images; positioning; sensors;
Conference_Titel :
Engineering in Medicine and Biology Society, 2004. IEMBS '04. 26th Annual International Conference of the IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-8439-3
DOI :
10.1109/IEMBS.2004.1403366
