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Related Concept Videos

Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Thoracic Aorta01:15

Thoracic Aorta

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The thoracic section of the aorta begins at the T5 vertebra and extends to the T12 level at the diaphragm, initially progressing through the mediastinum to the left of the spinal column. Throughout its course in the thoracic segment, the thoracic aorta emits various offshoots known collectively as visceral and parietal branches. The branches that predominantly supply blood to visceral organs are termed visceral branches and include bronchial, pericardial, esophageal, and mediastinal arteries,...
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Plastic Deformations01:19

Plastic Deformations

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Plastic deformation represents a fundamental concept in materials science, which explains the irreversible change in the shape of a material when it experiences stress beyond its elastic capability. This phenomenon is important in structural engineering, especially in designing and analyzing cantilever beams—structures that are securely fixed at one end and bear loads at the opposite end. When these beams are subjected to loads within their elastic range, they will return to their...
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Plastic Deformations01:14

Plastic Deformations

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It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
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Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

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Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
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Related Experiment Video

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Robust non-rigid image-to-patient registration for contactless dynamic thoracic tumor localization using recursive

Dongyuan Li1, Yixin Shan1, Yuxuan Mao1

  • 1organization=Institute of Biomedical Manufacturing and Life Quality Engineering, School of Mechanical Engineering, State Key Laboratory of Mechanical System and Vibration, Shanghai Jiao Tong University, city=Shanghai, postcode=200241, country=China.

Medical Image Analysis
|January 30, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel framework for real-time, contactless, non-rigid registration of thoracic tumors during surgery. The system reconstructs 4D CT scans and uses surface imaging for precise patient alignment, improving surgical navigation.

Keywords:
Computer-aided surgeryDeformable image registrationDiffusion modelsDynamic transthoracic localization

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Area of Science:

  • Medical Imaging
  • Surgical Navigation
  • Computational Anatomy

Background:

  • Real-time deformable image-to-patient registration is crucial but challenging for cross-modal thoracic applications.
  • Physiological motions like respiration complicate accurate tumor localization in dynamic thoracic environments.

Purpose of the Study:

  • To develop a robust, contactless, non-rigid registration framework for dynamic thoracic tumor localization.
  • To enable real-time spatial transformations across modalities, overcoming current clinical limitations.

Main Methods:

  • A Recursive Deformable Diffusion Model (RDDM) reconstructs 4D CT sequences from limited scans to capture respiratory dynamics.
  • A contactless non-rigid registration algorithm using GICP and stereo RGB-D imaging aligns patients in real-time.
  • Normal vector and expansion-contraction constraints enhance registration robustness and prevent local minima.

Main Results:

  • The RDDM demonstrated high anatomical fidelity across respiratory phases with a PSNR of 34.01 ± 2.78 dB.
  • The contactless registration framework showed preliminary clinical viability for tumor localization and high-precision tracking.
  • The system successfully captured intraoperative respiratory dynamics for improved localization.

Conclusions:

  • The proposed framework offers a robust solution for contactless, non-rigid registration in dynamic thoracic environments.
  • The system shows potential for seamless integration into surgical navigation systems for enhanced tumor localization.
  • This approach addresses key challenges in real-time cross-modal registration for improved surgical outcomes.