Sökning: "PVC algorithm"

Hittade 3 uppsatser innehållade orden PVC algorithm.

1. 1. Neural Networks for Material Decomposition in Photon-Counting Spectral CT

   Uppsats för yrkesexamina på avancerad nivå, KTH/Medicinteknik och hälsosystem

   Författare :Hugo Charrier; [2022]
   Nyckelord :PCCT; X-ray; scanner; photon counting; AI; neural networks;

   Sammanfattning : Photon counting computed tomography scanners constitute a major improvement of the field of computed tomography, opening various prospective and enabling the decomposition of computed tomography images into different materials. The material decomposition algorithm, mapping photon counts to material pathlengths, relies on a forward model with Poisson statistics. LÄS MER

3. 2. Image-Based Partial-Volume Correction in SPECT: Application to 177Lu radionuclide therapy

   Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

   Författare :Gustav Brolin; [2011]
   Nyckelord :nuklearmedicin; Medicine and Health Sciences;

   Sammanfattning : Introduction and aim: In SPECT imaging, the finite spatial resolution of the imaging system leads to a blurring of the reconstructed image. Consequently, counts originating from each point in the source distribution will be spread out over a volume in the reconstructed image, leading to spill-over of counts between different structures and distortion of the apparent activity concentration. LÄS MER

4. 3. Partial Volume Correction in PET/CT

   Uppsats för yrkesexamina på grundnivå, Medicinsk strålningsfysik (tills m KI)

   Författare :Lars Åkesson; [2008]
   Nyckelord :PVC algorithm; PET; image; PSF measurements;

   Sammanfattning : In this thesis, a two-dimensional pixel-wise deconvolution method for partial volume correction (PVC) for combined Positron Emission Tomography and Computer Tomography (PET/CT) imaging has been developed. The method is based on Van Cittert's deconvolution algorithm and includes a noise reduction method based on adaptive smoothing and median filters. LÄS MER