نتایج جستجو برای: filtered back projection

تعداد نتایج: 234805  

1974
Jan Kybic Thierry Blu Michael Unser

We formulate the tomographic reconstruction problem in a variational setting. The object to be reconstructed is considered as a continuous density function, unlike in the pixel-based approaches. The measurements are modeled as linear operators (Radon transform), integrating the density function along the ray path. The criterion that we minimize consists of a data term and a regularization term....

2009
M. A. Yousuf M. Asaduzzaman

Ring artifacts are very troublesome in a flat-panel based micro computed tomography (micro-CT) since they might severely degrade visibility of the micro-CT images. Unlike ring artifacts in other types of micro-CTs such as image-intensifier based micro-CT, ring artifacts in a flat-panel detector based micro-CT are hardly removable since the sensitivity of the pixel elements in a flat-panel detec...

2004
Toshimitsu Musha Andrzej Cichocki Sergei L. Shishkin Zbigniew Leonowicz Takashi Asada T. Kurachi

Objective: Improvement of detection of Alzheimer disease (AD) by filtering of EEG data using blind source separation (BSS) and projection of components which are possibly sensitive to cortical neuronal impairment found in early stages of AD. Method: Artifact-free 20 s intervals of raw resting EEG recordings from 22 mild AD patients and 38 age-matched controls were decomposed into spatio-tempora...

Journal: :Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology 2005
Andrzej Cichocki Sergei L Shishkin Toshimitsu Musha Zbigniew Leonowicz Takashi Asada Takayoshi Kurachi

OBJECTIVE Development of an EEG preprocessing technique for improvement of detection of Alzheimer's disease (AD). The technique is based on filtering of EEG data using blind source separation (BSS) and projection of components which are possibly sensitive to cortical neuronal impairment found in early stages of AD. METHODS Artifact-free 20s intervals of raw resting EEG recordings from 22 pati...

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