Ablation Monitoring with Elastography: 2D In-vivo and 3D Ex-vivo Studies

  • Authors:

  • Hassan Rivaz;Ioana Fleming;Lia Assumpcao;Gabor Fichtinger;Ulrike Hamper;Michael Choti;Gregory Hager;Emad Boctor

  • Affiliations:

  • ERC for Computer Integrated Surgery, Johns Hopkins University. Dept. of Surgical Oncology, Johns Hopkins Medicine. School of Computing, Queens University,;ERC for Computer Integrated Surgery, Johns Hopkins University. Dept. of Surgical Oncology, Johns Hopkins Medicine. School of Computing, Queens University,;ERC for Computer Integrated Surgery, Johns Hopkins University. Dept. of Surgical Oncology, Johns Hopkins Medicine. School of Computing, Queens University,;ERC for Computer Integrated Surgery, Johns Hopkins University. Dept. of Surgical Oncology, Johns Hopkins Medicine. School of Computing, Queens University,;ERC for Computer Integrated Surgery, Johns Hopkins University. Dept. of Surgical Oncology, Johns Hopkins Medicine. School of Computing, Queens University,;ERC for Computer Integrated Surgery, Johns Hopkins University. Dept. of Surgical Oncology, Johns Hopkins Medicine. School of Computing, Queens University,;ERC for Computer Integrated Surgery, Johns Hopkins University. Dept. of Surgical Oncology, Johns Hopkins Medicine. School of Computing, Queens University,;ERC for Computer Integrated Surgery, Johns Hopkins University. Dept. of Surgical Oncology, Johns Hopkins Medicine. School of Computing, Queens University,

  • Venue:
  • MICCAI '08 Proceedings of the 11th International Conference on Medical Image Computing and Computer-Assisted Intervention, Part II
  • Year:
  • 2008

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Abstract

The clinical feasibility of 2D elastography methods is hindered by the requirement that the operator avoid out-of-plane motion of the ultrasound image during palpation, and also by the lack of volumetric elastography measurements. In this paper, we develop and evaluate a 3D elastography method operating on volumetric data acquired from a 3D probe. Our method is based on minimizing a cost function using dynamic programming (DP). The cost function incorporates similarity of echo amplitudes and displacement continuity. We present, to the best of our knowledge, the first in-vivopatient studies of monitoring liver ablation with freehand DP elastography. 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 ex-vivoablation. Good agreement was observed between strain images, CT and gross pathology.