When a blood vessel model is irradiated with X-rays, the blood vessels themselves are not visible at first. It is only after the injection of a contrast medium that the blood vessels become visible.
Tasks
This experiment provides training in determining the length and position of an object based on an X-ray image. A metal pin that is embedded in a wooden block is used as the model. This experiment is also an excellent preparatory exercise for demonstrating the principle of computed ...
Principe de l'expérience
Le principe de la tomodensitométrie est démontré à l'aide des objets simples. Dans le cas des cibles simples, seulement quelques images sont nécessaires pour obtenir un bon résultat. Au plus les objets sont ...
Principle
With digital X-ray imaging, X-ray photons that interact with the detector are converted to a digital signal. This permits to record digital radiographies. With this experiment, the principles of digital detectors for X-ray imaging are laid out.
In X-ray imaging, resolution is an important factor. It determines the sharpness of the images and the de-tails of a sample that can be observed. In this experiment, the different factors that determine the resolu-tion are investigated.
X-ray computed tomography consists of using X-rays that are converted to a digital signal by a detector and computational algorithms to calculate virtual sections through an object without the need to physical-ly cut them. With this data it is possible to generate 3D ...
Alignment of the detector and the rotation stage is very important to get optimal quality images of a CT scan. In this experiment, the different possible misalignments and their correction are studied and de-scribed.
The quality of the image will improve with a number of parameters. In this experiment the different fac-tors influencing the quality of the CT Scan are investigated. One of the most important parameters is the number of projections. This is due to a longer scan time which results ...
X-ray sources produce a polychromatic spectrum which is altered when interacting with the sample. Due to this alteration, cupping effects in the reconstructed data of a CT scan. In extreme cases, such as when metal objects are present in the sample, more severe artefacts occur at ...
Depending on the type of CT scanner and the settings, the result of a CT scan of the same material can be different attenuation coefficient (grey-values). In order to make it easier to compare CT data, espe-cially in medicine, the grey-values of a CT scan are often rescaled to a ...
PHYWE présente la nouvelle unité de rayons x: une technologie novatrice, haut de la page sécurité, un confort maximum !
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