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Abstract #0063

MRI-Compatible Haptics: Strain Sensing for Real-Time Estimation of Three Dimensional Needle Deflection in MRI Environments

Yong-Lae Park1, Santhi Elayaperumal1, Seok Chang Ryu1, Bruce Daniel2, Richard J. Black3, Behzad Moslehi3, Mark R. Cutkosky1

1Mechanical Engineering, Stanford University, Stanford, CA, USA; 2Radiology, Stanford University, Stanford, CA, USA; 3Intelligent Fiber Optic Systems Corporation, Santa Clara, CA, USA

There is a need for methods to accurately manipulate instruments within closed MRI systems. During such procedures, it is useful to track deviations from the planned trajectory to minimize positioning error. This research focuses on using MRI-compatible sensors to measure strain on a standard biopsy needle. The sensors used are based on fiber Bragg grating (FBG) technology. FBG sensors produce wavelength shifts under various loads. Our results show that the FBG sensors do not produce image artifacts, and the sensor signals are not affected by the magnetic field.