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Anatomy-guided multi-resolution image reconstruction in PET.
Lesonen, P; Wettenhovi, V-V; Kolehmainen, V; Pulkkinen, A; Vauhkonen, M.
Afiliación
  • Lesonen P; Department of Technical Physics, University of Eastern Finland, Finland.
  • Wettenhovi VV; Department of Technical Physics, University of Eastern Finland, Finland.
  • Kolehmainen V; Department of Technical Physics, University of Eastern Finland, Finland.
  • Pulkkinen A; Department of Technical Physics, University of Eastern Finland, Finland.
  • Vauhkonen M; Department of Technical Physics, University of Eastern Finland, Finland.
Phys Med Biol ; 69(10)2024 May 08.
Article en En | MEDLINE | ID: mdl-38636506
ABSTRACT
Objective. In this paper, we propose positron emission tomography image reconstruction using a multi-resolution triangular mesh. The mesh can be adapted based on patient specific anatomical information that can be in the form of a computed tomography or magnetic resonance imaging image in the hybrid imaging systems. The triangular mesh can be adapted to high resolution in localized anatomical regions of interest (ROI) and made coarser in other regions, leading to an imaging model with high resolution in the ROI with clearly reduced number of degrees of freedom compared to a conventional uniformly dense imaging model.Approach.We compare maximum likelihood expectation maximization reconstructions with the multi-resolution model to reconstructions using a uniformly dense mesh, a sparse mesh and regular rectangular pixel mesh. Two simulated cases are used in the comparison, with the first one using the NEMA image quality phantom and the second the XCAT human phantom.Main results.When compared to the results with the uniform imaging models, the locally refined multi-resolution mesh retains the accuracy of the dense mesh reconstruction in the ROI while being faster to compute than the reconstructions with the uniformly dense mesh. The locally dense multi-resolution model leads also to more accurate reconstruction than the pixel-based mesh or the sparse triangular mesh.Significance.The findings suggest that triangular multi-resolution mesh, which can be made patient and application specific, is a potential alternative for pixel-based reconstruction.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Procesamiento de Imagen Asistido por Computador / Fantasmas de Imagen / Tomografía de Emisión de Positrones Límite: Humans Idioma: En Revista: Phys Med Biol Año: 2024 Tipo del documento: Article País de afiliación: Finlandia Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Procesamiento de Imagen Asistido por Computador / Fantasmas de Imagen / Tomografía de Emisión de Positrones Límite: Humans Idioma: En Revista: Phys Med Biol Año: 2024 Tipo del documento: Article País de afiliación: Finlandia Pais de publicación: Reino Unido