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Using high resolution X-ray computed tomography to create an image based model of a lymph node
L J Cooper1, B Zeller-Plumhoff1, G F Clough2
1Faculty of Engineering and the Environment, University of Southampton, Highfield Campus, Southampton SO17 1BJ, UK.
Insights
High-resolution X-ray imaging reveals fluid flow dynamics within murine lymph nodes. Faster fluid transport through the node center may explain particle movement into the cortex, aiding immune responses.
Area of Science:
- Immunology
- Biophysics
- Medical Imaging
Background:
- Lymph nodes are crucial for immune function, filtering lymphatic fluid.
- Understanding fluid dynamics within lymph nodes is vital for immune cell behavior and node structure.
- Experimental measurement of lymph node fluid flow is difficult due to size and fragility.
Purpose of the Study:
- To visualize lymph node structures using high-resolution X-ray computed tomography.
- To investigate the impact of these structures on fluid transport using an image-based model.
- To explore potential mechanisms of particle transport within lymph nodes.
Main Methods:
- Acquisition of high-resolution X-ray computed tomography images of a murine lymph node.
- Development of an image-based computational model to simulate fluid transport.
- Analysis of fluid velocity based on visualized lymph node structures and tissue permeability.
Main Results:
- Phase contrast X-ray computed tomography provided high contrast imaging of lymph node structures.
- Simulations indicated increased fluid velocity through interstitial channels.
- Fluid flowed faster through the center of the node (afferent to efferent vessel) than around the periphery.
Conclusions:
- High-resolution X-ray imaging and modeling can visualize lymph node fluid dynamics.
- Differential fluid velocities within the lymph node may facilitate particle transport to the cortex.
- This study offers insights into lymph node function and immune particle trafficking.
Abstract:
Lymph nodes are an important part of the immune system. They filter the lymphatic fluid as it is transported from the tissues before being returned to the blood stream. The fluid flow through the nodes influences the behaviour of the immune cells that gather within the nodes and the structure of the node itself. Measuring the fluid flow in lymph nodes experimentally is challenging due to their small size and fragility. In this paper, we present high resolution X-ray computed tomography images of a murine lymph node. The impact of the resulting visualized structures on fluid transport are investigated using an image based model. The high contrast between different structures within the lymph node provided by phase contrast X-ray computed tomography reconstruction results in images that, when related to the permeability of the lymph node tissue, suggest an increased fluid velocity through the interstitial channels in the lymph node tissue. Fluid taking a direct path from the afferent to the efferent lymphatic vessel, through the centre of the node, moved faster than the fluid that flowed around the periphery of the lymph node. This is a possible mechanism for particles being moved into the cortex.
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