An Improved Extrapolation Scheme for Truncated CT Data Using 2D Fourier-Based Helgason-Ludwig Consistency Conditions
نویسندگان
چکیده
منابع مشابه
An Improved Extrapolation Scheme for Truncated CT Data Using 2D Fourier-Based Helgason-Ludwig Consistency Conditions
We improve data extrapolation for truncated computed tomography (CT) projections by using Helgason-Ludwig (HL) consistency conditions that mathematically describe the overlap of information between projections. First, we theoretically derive a 2D Fourier representation of the HL consistency conditions from their original formulation (projection moment theorem), for both parallel-beam and fan-be...
متن کاملElliptical Extrapolation of Truncated 2D CT Projections Using Helgason-Ludwig Consistency Conditions
Image reconstruction from truncated tomographic data is an important practical problem in CT in order to reduce the X-ray dose and to improve the resolution. The main problem with the Radon Transform is that in 2D the inversion formula globally depends upon line integrals of the object function. The standard Filtered Backprojection algorithm (FBP) does not allow any type of truncation. A typica...
متن کاملAn improved opposition-based Crow Search Algorithm for Data Clustering
Data clustering is an ideal way of working with a huge amount of data and looking for a structure in the dataset. In other words, clustering is the classification of the same data; the similarity among the data in a cluster is maximum and the similarity among the data in the different clusters is minimal. The innovation of this paper is a clustering method based on the Crow Search Algorithm (CS...
متن کاملAn improved and efficient stenographic scheme based on matrix embedding using BCH syndrome coding.
This paper presents a new stenographic scheme based on matrix embedding using BCH syndrome coding. The proposed method embeds massage into cover by changing some coefficients of cover. In this paper defining a number :::as char:::acteristic of the syndrome, which is invariant with respect to the cyclic shift, we propose a new embedding algorithm base on BCH syndrome coding, without finding ro...
متن کاملPhotorealistic 2D to 3D Reconstruction with Improved GVC using Histogram-based Consistency measures
The improved GVC Algorithm proposed aims at high quality of 2-D to 3-D reconstruction by incorporating additional check of edge detection and usage of Histogrambased consistency as a photo consistency measure. The improved GVC algorithm comprises of two-stage consistency check, where at the first stage the multi modal histogram consistency check is applied on each uncarved voxel to determine it...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Biomedical Imaging
سال: 2017
ISSN: 1687-4188,1687-4196
DOI: 10.1155/2017/1867025