Výsledky vyhledávání - "Martti Kalke"

Sinogram Interpolation Method for Sparse-Angle Tomography

Publikováno v: Applied Mathematics. :423-441

In sparse-angle X-ray tomography reconstruction, where only a small number of projection images are taken around the object, appropriate sinogram interpolation has a significant impact on image quality. A novel sinogram interpolation method is introd

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b601ac75bcaec5f40b9aa3c69a9f193e
https://doi.org/10.4236/am.2014.53043

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Segmentation of facial bone surfaces by patch growing from cone beam CT volumes

Autor: Mikko Lilja, Kari Antila, Martti Kalke

Publikováno v: Antila, K, Mikko, L & Kalke, M 2016, ' Segmentation of facial bone surfaces by patch growing from cone beam CT volumes ', Dentomaxillofacial Radiology, vol. 45, no. 8, 8 . https://doi.org/10.1259/dmfr.20150435

Objectives: The motivation behind this work was to design an automatic algorithm capable of segmenting the exterior of the dental and facial bones including the mandible, teeth, maxilla and zygomatic bone with an open surface (a surface with a bounda

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a9b3a86f964972b7147df5f963a5ecf5
http://juuli.fi/Record/0274822316

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Adaptive frequency-domain regularization for sparse-data tomography

Autor: Samuli Siltanen, Martti Kalke

Publikováno v: Inverse Problems in Science and Engineering. 21:1099-1124

A novel reconstruction technique, called Wiener Filtered Reconstruction Technique (WIRT), for sparse-data tomographic imaging is introduced in this article. This six-step method applies a spatially-varying constrained least-squares filter combined wi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::eb658cce44f0cb7e71e9f4df851195ef
https://doi.org/10.1080/17415977.2012.738678

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Three-dimensional dental X-ray imaging by combination of panoramic and projection data

Autor: Martti Kalke, Nuutti Hyvönen, Matti Lassas, H. Setälä

Publikováno v: Inverse Problems & Imaging. 4:257-271

A novel three-dimensional dental X-ray imaging method is introduced, based on hybrid data collected with a dental panoramic device. Such a device uses geometric movement of the X-ray source and detector around the head of a patient to produce a panor

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6d27a44748510e1c4645106d0f92b60d
https://doi.org/10.3934/ipi.2010.4.257

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Bayesian inversion method for 3D dental X-ray imaging

Autor: Ville Kolehmainen, Samuli Siltanen, Matti Lassas, Martti Kalke, Antti Vanne, Seppo Järvenpää, Jari P. Kaipio

Publikováno v: University of Helsinki

Diagnostic and operational tasks in dentistry require three-dimensional (3D) information about tissue. A novel type of low dose dental 3D X-ray imaging is considered. Given projection images taken from a few sparsely distributed directions using the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c033d1fb68fcda72b4dae6b4b088d7fd
https://doi.org/10.1007/s00502-007-0450-7

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Parallelized Bayesian inversion for three-dimensional dental X-ray imaging

Autor: Martti Kalke, Jari P. Kaipio, Samuli Siltanen, Seppo Järvenpää, Antti Vanne, Matti Lassas, Ville Kolehmainen

Publikováno v: IEEE Transactions on Medical Imaging. 25:218-228

Diagnostic and operational tasks based on dental radiology often require three-dimensional (3-D) information that is not available in a single X-ray projection image. Comprehensive 3-D information about tissues can be obtained by computerized tomogra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8fcd886a12d5a20d6215b94681b8d1b0
https://doi.org/10.1109/tmi.2005.862662

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Wavelet-based reconstruction for limited-angle X-ray tomography

Autor: J. Moberg, S. Vanska, Matti Lassas, Seppo Järvenpää, Samuli Siltanen, Maaria Rantala, Martti Kalke

Publikováno v: IEEE Transactions on Medical Imaging. 25:210-217

The aim of X-ray tomography is to reconstruct an unknown physical body from a collection of projection images. When the projection images are only available from a limited angle of view, the reconstruction problem is a severely ill-posed inverse prob

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::644e4f979cf13cda81ab2e3432d5379e
https://doi.org/10.1109/tmi.2005.862206

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Automatic extraction of mandibular bone geometry for anatomy-based synthetization of radiographs

Autor: Jyrki Lötjönen, Mikko Lilja, Martti Kalke, Kari Antila

Publikováno v: Antila, K, Lilja, M, Kalke, M & Lötjönen, J 2008, Automatic extraction of mandibular bone geometry for anatomy based synthetization of radiographs . in 2008 30th Annual International Conference of the IEEE Engineering in Medicine and Biology Society . IEEE Institute of Electrical and Electronic Engineers, pp. 490-493, 30th Annual International IEEE EMBS Conference 2008, Vancouver, Canada, 20/08/08 . https://doi.org/10.1109/IEMBS.2008.4649197

We present an automatic method for segmenting Cone-Beam Computerized Tomography (CBCT) volumes and synthetizing orthopantomographic, anatomically aligned views of the mandibular bone. The model-based segmentation method was developed having the chara

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d5771fdba0a7697e00811a87399aa815
https://pubmed.ncbi.nlm.nih.gov/19162700

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Model-Based Segmentation of Reconstructed Dental X-Ray Volumes

Autor: Martti Kalke, Kari Antila, J. Lotjdnen, Mikko Lilja

Publikováno v: ICIP
Antila, K, Lilja, M, Kalke, M & Lötjönen, J 2006, Model-based segmentation of reconstructed dental x-ray volumes . in 2006 International Conference on Image Processing . IEEE Institute of Electrical and Electronic Engineers, pp. 1933-1936 . https://doi.org/10.1109/ICIP.2006.312792

Modern reconstruction algorithms allow volumetric imaging with conventional 2D dental X-ray systems. Volumetric images are useful in dental implantology, where the correct identification of key structures such as the edges of the mandible and the man

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5226f3f5b9d3038eda80370eac6c641
https://doi.org/10.1109/icip.2006.312792

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First results with real-time selenium-based full-field digital mammography three-dimensional imaging system

Autor: Mari Lehtimaki, M. Pamilo, Martti Kalke, Leena Raulisto

Publikováno v: SPIE Proceedings.

Our goal in this paper is to evaluate the capability of real-time selenium-technology-based full-field digital mammography (FFDM) system in breast tomosynthesis. The objective of this study is to find out the present status of amorphous selenium tech

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https://doi.org/10.1117/12.533393

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