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• W2543808465 abstract "We have previously developed regularized 2D and 3D elastography methods using Dynamic Programming (DP). A cost function which incorporates similarity of echo amplitudes and displacement continuity was minimized using DP to obtain the displacement map. In this work, we present a novel hybrid method for calculating the displacement map between two ultrasound images. The method uses DP in the first step to find an initial estimate of the motion field. In the second step, we assume a linear interpolation for the reference image and obtain a closed-form solution for a subpixel accuracy motion field. The closed-form solution enables fast displacement estimation. We present three in-vivo patient studies of monitoring liver ablation with the hybrid elastography method. The thermal lesion was not discernable in the B-mode image but it was clearly visible in the strain image as well as in validation CT. We also present 3D strain images from thermal lesions in <i xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>ex-vivo</i> ablation. We introduce a novel volumetric rendering model for visualization of the volumetric B-mode images. We exploit strain values in the opacity of the volumetric B-mode data to better classify soft tissue. It is possible to observe the surface of the hard lesions, its size and its appearance from a single 3D rendering picture." @default.
• W2543808465 created "2016-11-04" @default.
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• W2543808465 date "2008-11-01" @default.
• W2543808465 modified "2023-10-17" @default.
• W2543808465 title "Ablation monitoring with a regularized 3D elastography technique" @default.
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• W2543808465 doi "https://doi.org/10.1109/ultsym.2008.0076" @default.
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