Essays about: "Fotonräknande detektorer"

Showing result 1 - 5 of 7 essays containing the words Fotonräknande detektorer.

1. 1. Improving proton therapy planning with photon-counting spectral computed tomography

   University essay from KTH/Fysik

   Author : Karin Larsson; [2023]
   Keywords : Proton therapy; Medical imaging; Computed Tomography; Protonterapi; Medicinsk avbildning; Datortomografi;

   Abstract : Proton radiation therapy is an alternative to conventional photon radiation therapy, which accounts for the majority of radiation treatments today. The rationale for using protons in radiation therapy lies in their dose deposition properties; photons deposit a radiation dose inversely proportional to the energy, and therefore tissue depth, while protons exhibit a sharp Bragg peak when traversing matter. READ MORE

3. 2. Deep Ring Artifact Reduction in Photon-Counting CT

   University essay from KTH/Fysik

   Author : Konstantinos Liappis; [2022]
   Keywords : Photon¬counting; Spectral CT; Material Decomposition; Deep learning; Resnet; Ring artifact; Sinogram; Fotonräknande; Spektral datortomografi; Materialdekomposition; Djupinlärning; Resnet; Ringartefakt; Sinogram;

   Abstract : Ring artifacts are a common problem with the use of photon-counting detectors and commercial deployment rests on being able to compensate for them. Deep learning has been proposed as a candidate for tackling the inefficiency or high cost of traditional techniques. READ MORE

4. 3. High resolution x-ray imaging by measuring the induced charge distribution

   University essay from KTH/Fysik

   Author : Zihui Jin; [2022]
   Keywords : Computed tomography; photon-counting detector; silicon; spatial resolution; Datortomografi; fotonräknande detektor; kisel; spatial upplösning;

   Abstract : Computed tomography (CT) is a medical imaging technique used to create cross-section images of human bodies based on x-rays. The emerging photon-counting CT detector shows several advantages compared with the traditional energy integrating detector. READ MORE

5. 4. Material decomposition using a photon counting X-ray detector in low energy range

   University essay from Lunds universitet/Sjukhusfysikerutbildningen

   Author : Rasmus Solem; [2021]
   Keywords : Medicine and Health Sciences;

   Abstract : Material decomposition in X-ray imaging is used to separate different materials or elements in an image and to quantify their respective concentration. The material decomposition and quantification are made possible by the dependency of attenuation on the attenuating material and photon energy. READ MORE

6. 5. Learning the Forward Operator in Photon-Counting Computed Tomography

   University essay from KTH/Matematik (Avd.)

   Author : Emanuel Ström; [2021]
   Keywords : Photon-Counting; Computed Tomography; Spectral CT; Regularisation; Deep Learning; Fotonräknande; Datortomografi; Spektral CT; Regularisering; Djupinlärning;

   Abstract : Computed Tomography (CT) is a non-invasive x-ray imaging method capable of reconstructing highly detailed cross-sectional interior maps of an object. CT is used in a range of medical applications such as detection of skeletal fractures, organ trauma and artery calcification. READ MORE