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Related Concept Videos

Mesh Analysis01:20

Mesh Analysis

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Mesh analysis is a valuable method for simplifying circuit analysis using mesh currents as key circuit variables. Unlike nodal analysis, which focuses on determining unknown voltages, mesh analysis applies Kirchhoff's voltage law (KVL) to find unknown currents within a circuit. This method is particularly convenient in reducing the number of simultaneous equations that need to be solved.
A fundamental concept in mesh analysis is the definition of meshes and mesh currents. A mesh is a closed...
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Uniform Depth Channel Flow: Problem Solving01:18

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To calculate the flow rate for a trapezoidal channel, first, identify the bottom width, side slope, and flow depth of the channel. The cross-sectional area (A) corresponding to the depth of flow (y), channel bottom width (B), and side slope (θ) is determined by:Next, calculate the wetted perimeter, which includes the bottom width and the sloped side lengths in contact with the water. Using the values of the cross-sectional area and the wetted perimeter, determine the hydraulic radius by...
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Deformation of Member under Multiple Loadings01:11

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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
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Turbulent Flow: Problem Solving01:09

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Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
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Bone Remodeling01:40

Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Uniform Depth Channel Flow01:27

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Uniform depth channel flow keeps fluid depth consistent along channels such as irrigation canals. In natural channels, such as rivers, approximate uniform flow is often assumed. This condition occurs when the channel’s bottom slope matches the energy slope, balancing potential energy lost from gravity with head loss due to shear stress. This balance prevents depth changes along the channel length, resulting in a steady, uniform flow.Uniform flow in open channels with a constant cross-section...
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Optical Coherence Tomography Based Biomechanical Fluid-Structure Interaction Analysis of Coronary Atherosclerosis Progression
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Occlusion-robust scene flow-based tissue deformation recovery incorporating a mesh optimization model.

Jiahe Chen1, Kazuaki Hara1, Etsuko Kobayashi1

  • 1School of Engineering, The University of Tokyo, 7-3-1 Hongo, Tokyo, 113-8656, Japan.

International Journal of Computer Assisted Radiology and Surgery
|April 17, 2023
PubMed
Summary

This study presents a novel method for tissue deformation recovery using mesh structures and scene flow, improving accuracy and robustness to occlusion during minimally invasive surgery.

Keywords:
Computer-assisted interventionDeformation recoveryMinimally invasive surgeryScene flowStereo vision

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Area of Science:

  • Computer Vision
  • Medical Robotics
  • Surgical Simulation

Background:

  • Tissue deformation recovery is crucial for enhancing minimally invasive surgery safety by providing motion and shape data.
  • Binocular vision offers a practical, device-free approach, but existing methods struggle with biomechanical assumptions and occlusions.
  • Surgical instruments frequently cause occlusions, hindering accurate deformation tracking.

Purpose of the Study:

  • To develop a robust tissue deformation recovery method addressing limitations of prior approaches.
  • To improve the accuracy and reliability of shape and strain reconstruction in dynamic surgical environments.
  • To enhance the safety and effectiveness of minimally invasive procedures through better visual feedback.

Main Methods:

  • A two-step scene flow generation module extracts 3D motion from binocular image sequences.
  • A strain-based filtering technique is employed to denoise the generated scene flow data.
  • A mesh optimization model incorporates contextual connectivity to enhance robustness against occlusions.

Main Results:

  • The method successfully recovered surface deformation in phantom and in vivo experiments, even with tool-induced occlusion.
  • Quantitative evaluation in a phantom experiment showed a surface reconstruction accuracy of 0.70 ± 0.55 mm.
  • The approach demonstrated feasibility in real-world scenarios, including the presence of surgical forceps.

Conclusions:

  • The developed method effectively recovers surface deformation using mesh representations, showing resilience to surgical instrument occlusion.
  • This technique offers continuous deformation tracking, promising significant benefits for actual surgical applications.
  • The approach enhances the potential for real-time, accurate visual guidance in minimally invasive surgery.