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Related Concept Videos

Uniform Depth Channel Flow01:27

Uniform Depth Channel Flow

183
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...
183
Uniform Depth Channel Flow: Problem Solving01:18

Uniform Depth Channel Flow: Problem Solving

134
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...
134

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Related Experiment Video

Updated: Sep 24, 2025

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation
06:56

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation

Published on: January 7, 2021

2.5K

Robust fetoscopic mosaicking from deep learned flow fields.

Oluwatosin Alabi1, Sophia Bano2, Francisco Vasconcelos3

  • 1University of Bordeaux, Bordeaux, France.

International Journal of Computer Assisted Radiology and Surgery
|May 3, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces a new fetoscopic mosaicking method for twin-to-twin transfusion syndrome surgery. It improves placental imaging by tracking all consistent pixels, outperforming current techniques, especially with difficult-to-see vessels.

Keywords:
FetoscopyOptical flowTwin-to-twin transfusion syndromeVideo mosaicking

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Area of Science:

  • Medical Imaging
  • Surgical Navigation
  • Fetal Surgery

Background:

  • Twin-to-twin transfusion syndrome (TTTS) requires minimally invasive fetoscopic laser photocoagulation.
  • Accurate placental visualization is crucial for surgical navigation during TTTS treatment.
  • Current fetoscopic mosaicking methods often rely on visible placental vessels for registration.

Purpose of the Study:

  • To develop an improved fetoscopic mosaicking approach for placental visualization during TTTS surgery.
  • To overcome limitations of current methods, particularly when placental vessels are not clearly visible.

Main Methods:

  • A novel fetoscopic mosaicking technique combining deep learning optical flow with robust estimation.
  • Filtering of inconsistent motion caused by particles and specularities.
  • Registration based on consistent pixel motion, not solely on visible vessels.

Main Results:

  • The proposed method demonstrates superior performance compared to state-of-the-art vessel-based and optical flow methods.
  • Effectiveness is particularly notable in cases with poorly visible or thin placental vessels.
  • Consistent placental vessel mosaics were successfully generated in challenging scenarios.

Conclusions:

  • The developed fetoscopic mosaicking approach enhances surgical navigation for TTTS treatment.
  • It provides reliable placental imaging even when vessels are difficult to identify.
  • This method offers a significant advancement for challenging fetoscopic procedures.