Enhanced ULtrasound Visualization of Brachytherapy Seeds by a Novel Magnetically Induced Motion Image Method
Annual rept. 1 Apr 2005-31 Mar 2006
ROCHESTER UNIV NY
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We report our progress in developing Magnetically Induced Motion Imaging MIMI for unambiguous identification and localization brachytherapy seeds in ultrasound images. In this period we have developed finite-element models for calculating the force on a soft ferromagnetic seed core due to geometrical anisotropy and compared two candidate seed geometries to determine the sensitivity of torque to geometry. We have created a finite element model of a prototype coil configuration for seed vibration and demonstrated the ability of this coil configuration to steer the magnetic field in a manner suitable for improving MIMI imaging. We present our first 3D reconstructions of seeds embedded in a tissue-mimicking phantom the reconstructions show good agreement with previous simulations. The insensitivity of the vibration Doppler signal to ultrasound beam angle and ultrasound frequency is experimentally demonstrated.
- Medicine and Medical Research