نتایج جستجو برای: filtered back projection

تعداد نتایج: 234805  

Journal: :IEEE transactions on medical imaging 1994
Jean-Pierre V. Guédon Yves Bizais

A new way to discretize the filtered back-projection (FBP) algorithm is presented. The function basis is the Haar system (2D product of rectangular windows). This scheme allows one to derive the optimal shape of the apodisation window, which is angle varying, and the oversampling ratio between the pixel and the projection cell size. The discrete equivalent filter is also derived. The comparison...

2014
Andrew Ryan Benjamin Mora

Expectation Maximization and Filtered Back Projection are two common techniques for Tomographic reconstruction of images and volumes. While papers often demonstrat that EM produces higher quality reconstructions, particularly from lower numbers of projections, FBP remains popular due to its low computational complexity. In the following work we present and analyse a modified Expectation Maximiz...

Journal: :Journal of the Korean Society of Radiology 2014

Journal: :AJNR. American journal of neuroradiology 2015
W Wuest M S May M Brand N Bayerl A Krauss M Uder M Lell

BACKGROUND AND PURPOSE Metal artifacts from dental fillings and other devices degrade image quality and may compromise the detection and evaluation of lesions in the oral cavity and oropharynx by CT. The aim of this study was to evaluate the effect of iterative metal artifact reduction on CT of the oral cavity and oropharynx. MATERIALS AND METHODS Data from 50 consecutive patients with metal ...

Journal: :AJNR. American journal of neuroradiology 2016
J-E Scholtz M Kaup K Hüsers M H Albrecht B Bodelle S C Metzger J M Kerl R W Bauer T Lehnert T J Vogl J L Wichmann

BACKGROUND AND PURPOSE Dose-saving techniques in neck CT cause increased image noise that can be counteracted by iterative reconstruction. Our aim was to evaluate the image quality of advanced modeled iterative reconstruction (ADMIRE) in contrast-enhanced low-tube-voltage neck CT. MATERIALS AND METHODS Sixty-one patients underwent 90-kV(peak) neck CT by using third-generation 192-section dual...

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