نتایج جستجو برای: filtered back projection

تعداد نتایج: 234805  

2011
R Kishore B R Karthikeyan Preetham Shankpal

A CT reconstruction algorithm to obtain selective tomography from multiple CT slices for localized 3D reconstruction is developed. The proposed method uses Radon transform to obtain projections for a region of interest. Image reconstruction is performed using filtered back projection technique. The property that distinguishes the developed algorithm from previous algorithms is the ability to tr...

Journal: :CoRR 2017
Wenxiang Cong Ge Wang Qingsong Yang Jiang Hsieh Jia Li Rongjie Lai

Regularization methods are commonly used in X-ray CT image reconstruction. Different regularization methods reflect the characterization of different prior knowledge of images. In a recent work, a new regularization method called a low-dimensional manifold model (LDMM) is investigated to characterize the low-dimensional patch manifold structure of natural images, where the manifold dimensionali...

A. Zakaria, M.N. Salihin Yusoff,

Background: Butterworth, Gaussian, Hamming, Hanning, and Parzen are commonly used SPECT filters during filtered back-projection (FBP) reconstruction, which greatly affect the quality and size accuracy of image. Materials and Methods: This study involved a cardiac phantom in which 1.10 cm thick cold defect was inserted into its myocardium wall and filled with 4.0 μCi/ml (0.148 MBq/ml) 99mTc conc...

2000
Marjolein van der Glas

The total attenuation suffered by one beam of x-rays as it travels in a straight line through an object can be represented by a line integral. Combining a set of line integrals forms a projection. With the filtered back projection a three-dimensional reconstruction of the object can de made by using projections from different angles. The quality of a reconstructed image depends on the number of...

2011
Shayan Goliaei Seyed Ghorshi Mohammad Mortazavi

Medical images contain information about vital organic tissues inside of human body and are widely used for diagnoses of disease or for surgical purposes. Image reconstruction is essential for medical images for some applications such as suppression of noise or de-blurring the image to provide images with better quality and contrast. In this paper Kalman filter technique is introduced for medic...

Journal: :Journal of Computer Assisted Tomography 2021

Objective The aim of this study was to compare the contrast gray white matter between forward-projected model-based iterative reconstruction solution (FIRST) and hybrid (IR) by measuring computed tomography value brain parenchyma. Methods Computed values in 15 areas 21 patients (7 males, 14 females; average age, 49.5 ± 10.7 years) were measured compared FIRST IR with filtered back projection (F...

Journal: :Japanese Journal of Radiological Technology 2021

Purpose Digital breast tomosynthesis (DBT) imaging uses two types of image reconstruction. methods, i.e., filtered back projection (FBP) method and an iterative reconstruction (IR) method. Although the effect difference in on quality has been reported, these studies were performed using different apparatus or conditions. In this study, we examined same equipment under Method We measured reflect...

2004
Jun Li Lihong V. Wang

An optical imaging technique called ultrasound-modulated optical computed tomography is demonstrated for tomographic imaging of biological tissues. Ultrasound-modulated optical signals are extracted from scattered light to provide projection data for the image reconstruction. A filtered back-projection algorithm is implemented to reconstruct an image reflecting optical tissue properties from an...

Journal: :CoRR 2009
Joseph Shtok Michael Zibulevsky Michael Elad

In this work we explore direct reconstruction algorithms for Computed Tomography, based on principles of Filtered Back-Projection (FBP). Special attention is given to the problem of image reconstruction in Region Of Interest (ROI) from truncated projections. In the proposed linear reconstruction scheme the ramp filter of FBP is replaced with a statistically trained spatially-variant 2-D convolu...

Journal: :Proceedings of SPIE--the International Society for Optical Engineering 2010
Weihua Zhou Xin Qian Jianping Lu Otto Zhou Ying Chen

Digital breast tomosynthesis is a new technique to improve the early detection of breast cancer by providing three-dimensional reconstruction volume of the object with limited-angle projection images. This paper investigated the image reconstruction with a standard biopsy training breast phantom using a novel multi-beam X-ray sources breast tomosynthesis system. Carbon nanotube technology based...

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