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24 February 2012 Multi-grid tomographic inversion for breast ultrasound imaging
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A multi-grid tomographic inversion approach that uses variable grid sizes in both forward modeling and inverse process is proposed and tested on breast phantom data and breast ultrasound data. In iterative tomographic inversion, fine scale features are more sensitive to starting model than coarse scale features. The proposed multi-grid algorithm starts from coarse grids for both forward modeling and inverse process and gradually proceeds to fine grids, which can effectively suppress artifacts related to over iteration of fine scale features. Since the computational complexity of inverse problems increases with number of grid points in both forward model and inverse model, the proposed algorithm greatly reduces the computational cost in contrast to standard fixed-grid approaches. Both in vitro and in vivo results indicate that the proposed multi-grid methods result in significant improvement in the inverted sound speed and attenuation images compared to fixed-grid methods.
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Cuiping Li, Alexander Stewart, and Neb Duric "Multi-grid tomographic inversion for breast ultrasound imaging", Proc. SPIE 8320, Medical Imaging 2012: Ultrasonic Imaging, Tomography, and Therapy, 83200R (24 February 2012);

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