RAPID HYBRID ULTRASOUND VOLUME REGISTRATION
U. Z. Ijaz, R. W. Prager, A. H. Gee, and G. M. Treece.
March 2010
This work is concerned with registration of ultrasound volumes acquired using a mechanically swept 3D probe to produce extended-field-of-view images. While the registration can be achieved by attaching a position sensor to the probe, this can be an inconvenience in a clinical setting and aligns the volumes incorrectly if there is tissue motion due to subject movement or respiratory motion. The objective of this work is to replace the 6 degree of freedom (DOF) sensor with a combination of 3 DOF image registration and an unobtrusively integrated inertial sensor for measuring orientation. We aim to produce a highly reliable system that is able to register a pair of volumes very quickly, making it suitable for clinical use. As such, this is an extension of our previous work and provides further results for a fast implementation of the Nelder-Mead simplex algorithm using reslices. Additionally, we provide some results for a voxel-array based multiresolution search algorithm. The multiresolution approach has a more complete coverage of the search space at the expense of speed and is more exhaustive in comparison to the Nelder-Mead Simplex algorithm. With similar reliability statistics for the two algorithms, both are possible candidates for a clinical system.
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