Het doel van dit onderzoek is het aantonen van een betere beeldkwaliteit, op basis van spatiële resolutie en contrastresolutie, bij een DR beeldvormend systeem vergeleken met een CR beeldvormend systeem. Dit onderzoek werd met een fantoom uitgevoerd en door laboranten beoordeeld op de beeldkwaliteit …

Research is done on the properties of a niobium superconducting magnetic shield sample (see image below this abstract), its magnetic attenuation; and behaviour around the transition temperature 9.25 K. The attenuation of the magnetic shield sample was measured in a cryogenic setup. This is required to …

In the medical community, X-rays are an important tool in imaging the human body. In principle X-ray images are 2 dimensional images. By measuring such X-ray images at multiple angles, one can construct the 3 dimensional inner structure of the sample. This 3 dimensional structure is created by applying …

The Pierre Auger group is studying ultra-high energy cosmic rays. Cosmic rays are charged particles which permanently hit and penetrate the atmosphere of the Earth. They will at a certain moment collide with nuclei in the atmosphere, like nitrogen. The results of such an interaction are new particles, …

PRRT is a method of treatment that is used for a variety of diseases. In this method of treatment patient are infused with a radiopharmaceutical. This radiopharmaceutical will deliver a radiation dose to the specific targeted organ. However, due to infusion in the bloodstream other organs will also sustain …

The COMPASS system (IBADosimetry) is a quality assurance (QA) tool which reconstructs 3D doses inside a phantom or a patient CT. The dose is predicted according to the RT plan with a correction derived from 2D measurements of a matrix detector. This correction method is necessary since a direct reconstruction …

This study explores the capability of the COMPASS system (IBA Dosimetry, Germany) to detect leaf positioning errors of a high resolution MLC with 4mm leaf width using a lower resolution (7.62mm detector spacing) 2D matrix of ionisation chambers

Door de komst van de digitale röntgentechniek waarbij gebruik wordt gemaakt van een flatpaneldetector zou de patiëntendosis verder omlaag kunnen gaan ten opzichte van de conventionele radiologie. In de praktijk is dit echter nog niet het geval. Om de detector optimaal te benutten hebben we op een aantal …

In a real-world environment a face detector can be applied to extract multiple face images from multiple video streams without constraints on pose and illumination. The extracted face images will have varying image quality and resolution. Moreover, also the detected faces will not be precisely aligned. …