Essays about: "Sinogram"

Showing result 1 - 5 of 6 essays containing the word Sinogram.

1. 1. 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

3. 2. 2D & 3D phase retrieval for propagation-based X-ray phase-contrast tomography

   University essay from Lunds universitet/Synkrotronljusfysik; Lunds universitet/Fysiska institutionen

   Author : Philip Stjärneblad; [2021]
   Keywords : Propagation-based X-ray phase-contrast tomography; PB-PCT; Propagation-based X-ray phase-contrast Imaging; PB-PCI; 2d phase retrieval; 3d phase retrieval; TIE; sinogram consistency; reconstruction artefacts; Science General;

   Abstract : Propagation-based X-ray phase-contrast tomography is a 3d imaging technique that utilizes two-dimensional projections from different angular views $\theta =[0,\pi]$ to reconstruct the 3D object information. The phase-contrast allows for higher feature contrast than conventional transmission tomography, as the phase interference gives rise to a sharp edge contrast. READ MORE

4. 3. Evaluation of deep-learning image reconstruction for photon-counting spectral CT : A comparison between image domain- and projection domain-denoising

   University essay from KTH/Skolan för teknikvetenskap (SCI)

   Author : Morris Eriksson; Hannes Karlsson; [2021]
   Keywords : ;

   Abstract : A promising new technology in medical imaging is photon-counting detectors (PCD). Itcould allow for images with higher resolution, less noise, improved material decomposi-tion while possibly reducing radiation exposure for patients. READ MORE

5. 4. Characterization of Center-of-Mass and Rebinning in Positron Emission Tomography with Motion

   University essay from KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

   Author : Linder Hugo; [2021]
   Keywords : positron emission tomography; center of mass; motion correction;

   Abstract : Medical molecular imaging with positron emission tomography (PET) is sensitive to patient motion since PET scans last several minutes. Despite advancements in PET, such as improved photon-pair time-of-flight (TOF) difference resolution, motion deformations limit image resolution and quantification. READ MORE

6. 5. Calculating Center of Mass Using List Mode Data from PET Biograph128 mCT-1104

   University essay from KTH/Medicinteknik och hälsosystem

   Author : Lukas Rane; Henrik Runeskog; [2019]
   Keywords : PET; List Mode; Image Reconstruction; e7-tools; Siemens; Center of Mass; PET; List Mode; Bildrekonstruktion; e7-tools; Siemens; Masscentrum;

   Abstract : A common problem within positron emission tomography examinations of the brain is the motion of the patient. If the patients ́ head moves during an examination all the data acquired after the movement will not be suited for clinical use. This means that a lot of data recovered from PET is not used at all. READ MORE