Computed Tomography
Computed Tomography - Related Videos
01:10
Computed Tomography
0 Views •
2023
Tomography refers to imaging by sections. Computed tomography (CT) is a non-invasive imaging technique that uses computers to analyze several cross-sectional X-rays to reveal minute details about structures in the body. The technique was invented in the 1970s and is based on the principle that as X-rays pass through the body, they are absorbed or reflected at different levels. In the technique, a patient lies on a motorized platform while a computerized axial tomography (CAT) scanner rotates...
02:05
Visualization of a Cerebral Thrombus in a Mouse Using Micro-Computed Tomography Imaging
0 Views •
2025
Source: Kim, D., et. al. Combined Near-infrared Fluorescent Imaging and Micro-computed Tomography for Directly Visualizing Cerebral Thromboemboli. J. Vis. Exp. (2016)This video demonstrates visualization of cerebral thrombus in mice using micro-computed tomography (micro-CT) imaging. A cerebral thrombus mouse model is injected with fibrin-targeted gold nanoparticles acting as a contrasting agent. The mouse is placed on the bed of a micro-CT machine, and images are acquired from multiple angles.
12:24
Computed Tomography-guided Time-domain Diffuse Fluorescence Tomography in Small Animals for Localization of Cancer Biomarkers
0 Views •
Cited by 18 •
2012
Diffuse fluorescence tomography offers a relatively low-cost and potentially high-throughout approach to preclinical in vivo tumor imaging. The methodology of optical data collection, calibration, and image reconstruction is presented for a computed tomography-guided non-contact time-domain system using fluorescent targeting of the tumor biomarker epidermal growth factor receptor in a mouse glioma model.
06:56
Tree Core Analysis with X-ray Computed Tomography
0 Views •
Cited by 10 •
2023
Here we show how to process tree cores with an X-ray computed tomography toolchain. Except for chemical extraction for some purposes, no further physical lab treatment is needed. The toolchain can be used for biomass estimations, for obtaining MXD/tree-ring width data as well as for obtaining quantitative wood anatomy data.
01:00
Single Photon Emission Computed Tomography for Assessing Brain Function Disruption
0 Views •
2025
A traumatic brain injury, or TBI, impairs blood flow to the impacted regions and disrupts the activity of dopaminergic neurons.To investigate TBI-associated disruptions, begin by intravenously injecting a lipophilic radioactive tracer into a patient.The tracer travels through the cerebral vessels and diffuses into cells of the cortical and subcortical brain tissue.Perform single photon emission computed tomography, or SPECT, to detect the tracer-emitted radiation. The resulting signal intensity...
FAQs
Material-dependent X-ray attenuation creates the contrast used in CT data. As the beam passes through a component, different materials reduce its intensity by different amounts, and detectors record those changes at multiple angular positions. The resulting variation allows reconstruction algorithms to distinguish internal regions, making hidden interfaces and defects visible in the reconstructed image.
Multiple viewing angles are essential because a single projection compresses overlapping internal features into one measurement. Rotating the source and detectors supplies complementary projections, while reconstruction combines them into slices or a three-dimensional volume. This angular sampling helps separate structures at different locations and supports interpretation of complex components without opening them.
Computed tomography can expose voids, cracks, inclusions, porosity, and other manufacturing defects that may remain hidden from an exterior inspection. Their locations within slices or a volume image give engineers evidence about internal integrity. That evidence supports evaluation of whether a component, assembly, or advanced material contains features requiring further investigation.
The nondestructive character of CT matters because engineers can inspect a component or assembly without cutting it open. Internal evidence remains linked to the original object, allowing the same item to be examined for integrity, dimensions, defects, or failure-related features. This makes CT useful when preserving the tested hardware is important.
A typical engineering CT workflow begins by positioning the object between an X-ray source and detectors, then collecting measurements as the system rotates around it. Reconstruction algorithms process the projection data into cross-sectional slices or a three-dimensional volume image. Engineers can then inspect internal structure and assess features relevant to the component or material.
For dimensional inspection, the reconstructed slices or volume provide an internal view that can be related to the geometry of a component or assembly. This is especially valuable when important features are enclosed and cannot be evaluated from the outside. The resulting information can guide engineering decisions about design and manufacturing processes.
When used for nondestructive testing, CT helps evaluate integrity while avoiding destructive sectioning. Engineers examine the reconstructed interior for voids, cracks, inclusions, porosity, and manufacturing defects, then use the observed condition to support quality assessment or process improvement. The approach is therefore relevant to components, assemblies, and advanced materials.
In failure analysis, CT supplies internal structural evidence that can be examined alongside the failed component’s observed condition. Hidden cracks, voids, inclusions, or porosity may help characterize features associated with a manufacturing defect or loss of integrity. For engineering research, these findings can guide process changes and inform subsequent design decisions.