4d-ct Scan
4d-ct Scan - Related Videos
05:27
FDG Based PET/CT Scan: A Method of Using Radiotracer for Non-invasive Imaging of Tumor Metabolism
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2023
This article describes multimodality imaging of cancerous tissues with PET and CT diagnostic imaging by using a radiotracer 18F-FDG. Cancerous tissue with high glycolytic activity uptakes more 18F-FDG.
10:42
In Depth Analyses of LEDs by a Combination of X-ray Computed Tomography (CT) and Light Microscopy (LM) Correlated with Scanning Electron Microscopy (SEM)
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Cited by 2 •
2016
A workflow for comprehensive micro-characterization of active optical devices is outlined. It contains structural as well as functional investigations by means of CT, LM and SEM. The method is demonstrated for a white LED which can be still be operated during characterization.
12:38
4D Multimodality Imaging of Citrobacter rodentium Infections in Mice
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Cited by 19 •
2013
Multi-modality imaging is a valuable approach for studying bacterial colonization in small animal models. This protocol outlines infection of mice with bioluminescent Citrobacter rodentium and the longitudinal monitoring of bacterial colonization using composite 3D diffuse light imaging tomography with μCT imaging to create a 4D movie of C. rodentium infection.
06:23
Leveraging Micro-CT Scanning to Analyze Parasitic Plant-Host Interactions
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Cited by 6 •
2022
Micro-CT is a non-destructive tool that can analyze plant structures in three dimensions. The present protocol describes the sample preparation to leverage micro-CT to analyze parasitic plant structure and function. Different species are used to highlight the advantages of this method when coupled with specific preparations.
11:18
Micro-CT Imaging of a Mouse Spinal Cord
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2023
Source: Peiman Shahbeigi-Roodposhti and Sina Shahbazmohamadi, Biomedical Engineering Department, University of Connecticut, Storrs, Connecticut It's a little-known fact that the discovery and (inadvertent) use of X-rays garnered the first ever Nobel Prize in Physics. The famous X-ray image of Dr. Röntgen's wife's hand from 1895 that sent shock waves through the scientific community looks like most modern day 2D medical X-ray images. Though it is not the newest technology, X-ray absorption...
FAQs
Respiratory or cardiac gating links each CT image to a point in a repeating physiological cycle. The scanner records image data while motion occurs, and the gating signal helps organize those data according to timing. This allows clinicians to examine how an anatomical structure changes through the cycle rather than combining motion into one undifferentiated static representation.
Image sorting and reconstruction convert motion-related CT data into time-resolved image sets. Sorting places acquired images into corresponding phases of respiratory or cardiac activity, while reconstruction produces interpretable anatomical views for those phases. The resulting series helps show the range and pattern of movement, which is essential when anatomy changes position during imaging or treatment.
A static CT image shows anatomy at one imaging state, whereas 4D-CT displays changes across a physiological cycle. This distinction matters when movement affects the apparent location or shape of a structure. By revealing motion rather than only a fixed position, the technique supports decisions that account for changing anatomy in the chest, abdomen, and other relevant regions.
The process begins with CT image acquisition while a physiological motion cycle is occurring. Respiratory or cardiac timing is tracked during collection, after which the images are sorted by their position within that cycle. Reconstruction then produces time-resolved image sets that clinicians can review to characterize anatomical movement and its potential effect on planning.
In radiation therapy planning, 4D-CT helps characterize how a tumor and nearby organs move, particularly in the chest and abdomen. This information can improve target definition by showing where the target may be during the relevant physiological cycle. Treatment planning can then incorporate movement instead of depending solely on a static anatomical position.
Dynamic information is especially useful when clinicians need to assess anatomy that changes during respiration or cardiac activity. The reconstructed image sets can reveal movement patterns and help identify planning strategies that accommodate those changes. This supports evaluation of dynamic anatomy and can improve treatment accuracy when motion would otherwise complicate target localization.