A Multi-stage Evolutionary Tomographic Reconstruction Algorithm Using Ultrasound Time-of-Flight Projections

2021 ◽  
pp. 137-145
Author(s):  
Shyam Prasad Kodali ◽  
Boggarapu Nageswara Rao
Keyword(s):  
Tomographic Reconstruction ◽  
Time Of Flight ◽  
Reconstruction Algorithm ◽  
Multi Stage

scholarly journals Correction for the Partial Volume Effects (PVE) in Nuclear Medicine Imaging: A Post-Reconstruction Analytic Method

2021 ◽  
Vol 11 (14) ◽  
pp. 6460
Author(s):  
Fabio Di Martino ◽  
Patrizio Barca ◽  
Eleonora Bortoli ◽  
Alessia Giuliano ◽  
Duccio Volterrani
Keyword(s):  
Nuclear Medicine ◽  
Imaging System ◽  
Tomographic Reconstruction ◽  
Mathematical Expression ◽  
Reconstruction Algorithm ◽  
Volume Effect ◽  
Nuclear Medicine Imaging ◽  
Theoretical Derivation ◽  
Reconstruction Process ◽  
Partial Volume

Quantitative analyses in nuclear medicine are increasingly used, both for diagnostic and therapeutic purposes. The Partial Volume Effect (PVE) is the most important factor of loss of quantification in Nuclear Medicine, especially for evaluation in Region of Interest (ROI) smaller than the Full Width at Half Maximum (FWHM) of the PSF. The aim of this work is to present a new approach for the correction of PVE, using a post-reconstruction process starting from a mathematical expression, which only requires the knowledge of the FWHM of the final PSF of the imaging system used. After the presentation of the theoretical derivation, the experimental evaluation of this method is performed using a PET/CT hybrid system and acquiring the IEC NEMA phantom with six spherical “hot” ROIs (with diameters of 10, 13, 17, 22, 28, and 37 mm) and a homogeneous “colder” background. In order to evaluate the recovery of quantitative data, the effect of statistical noise (different acquisition times), tomographic reconstruction algorithm with and without time-of-flight (TOF) and different signal-to-background activity concentration ratio (3:1 and 10:1) was studied. The application of the corrective method allows recovering the loss of quantification due to PVE for all sizes of spheres acquired, with a final accuracy less than 17%, for lesion dimensions larger than two FWHM and for acquisition times equal to or greater than two minutes.

scholarly journals Parallel approach to tomographic reconstruction algorithm using a Nvidia GPU

2019 ◽  
Author(s):  
Tomás Antonio Valencia Pérez ◽  
Javier Miguel Hernández López ◽  
Eduardo Moreno Barbosa ◽  
Mario Iván Martínez Hernández ◽  
Guillermo Tejeda Muñoz ◽  
...  
Keyword(s):  
Tomographic Reconstruction ◽  
Reconstruction Algorithm ◽  
Nvidia Gpu

scholarly journals Simulation studies on the tomographic reconstruction of the equatorial and low-latitude ionosphere in the context of the Indian tomography experiment: CRABEX

2004 ◽  
Vol 22 (10) ◽  
pp. 3445-3460 ◽  
Author(s):  
S. V. Thampi ◽  
T. K. Pant ◽  
S. Ravindran ◽  
C. V. Devasia ◽  
R. Sridharan
Keyword(s):  
Tomographic Reconstruction ◽  
Reconstruction Algorithm ◽  
Equatorial Region ◽  
Spatial And Temporal Variability ◽  
Inversion Algorithm ◽  
Low Latitude ◽  
Density Distributions ◽  
Path Modelling ◽  
Low Latitude Ionosphere ◽  
Value Decomposition

Abstract. Equatorial ionosphere poses a challenge to any algorithm that is used for tomographic reconstruction because of the phenomena like the Equatorial Ionization Anomaly (EIA) and Equatorial Spread F (ESF). Any tomographic reconstruction of ionospheric density distributions in the equatorial region is not acceptable if it does not image these phenomena, which exhibit large spatial and temporal variability, to a reasonable accuracy. The accuracy of the reconstructed image generally depends on many factors, such as the satellite-receiver configuration, the ray path modelling, grid intersections and finally, the reconstruction algorithm. The present simulation study is performed to examine these in the context of the operational Coherent Radio Beacon Experiment (CRABEX) network just commenced in India. The feasibility of using this network for the studies of the equatorial and low-latitude ionosphere over Indian longitudes has been investigated through simulations. The electron density distributions that are characteristic of EIA and ESF are fed into various simulations and the reconstructed tomograms are investigated in terms of their reproducing capabilities. It is seen that, with the present receiver chain existing from 8.5° N to 34° N, it would be possible to obtain accurate images of EIA and the plasma bubbles. The Singular Value Decomposition (SVD) algorithm has been used for the inversion procedure in this study. As is known, by the very nature of ionospheric tomography experiments, the received data contain various kinds of errors, like the measurement and discretization errors. The sensitivity of the inversion algorithm, SVD in the present case, to these errors has also been investigated and quantified.

A new method for inpainting of depth maps from time-of-flight sensors based on a modified closing by reconstruction algorithm

2017 ◽  
Vol 47 ◽  
pp. 36-47 ◽  
Author(s):  
Marco Antonio Garduño-Ramón ◽  
Ivan Ramon Terol-Villalobos ◽  
Roque Alfredo Osornio-Rios ◽  
Luis Alberto Morales-Hernandez
Keyword(s):  
Time Of Flight ◽  
Reconstruction Algorithm ◽  
New Method ◽  
Depth Maps

A hybrid tomographic reconstruction algorithm for high speed X-ray tomography

2015 ◽  
Vol 196 ◽  
pp. 27-35 ◽  
Author(s):  
Xiaogang Yang ◽  
J. Ruud van Ommen ◽  
Jasper Schoormans ◽  
Robert F. Mudde
Keyword(s):  
High Speed ◽  
Tomographic Reconstruction ◽  
Reconstruction Algorithm ◽  
X Ray

A Simplified 3D Reconstruction Technique for Tomographic Particle Image Velocimetry

2013 ◽  
Vol 718-720 ◽  
pp. 2184-2190
Author(s):  
Bao Quan ◽  
Jiang Nan
Keyword(s):  
Particle Image Velocimetry ◽  
3D Reconstruction ◽  
Particle Image ◽  
Tomographic Reconstruction ◽  
Three Dimensional ◽  
Reconstruction Algorithm ◽  
Tomographic Particle Image Velocimetry ◽  
Image Velocimetry ◽  
3D Volume ◽  
Reconstruction Model

Tomographic particle image velocimetry (Tomo-PIV) is a newly developed technique for three-component three-dimensional (3C-3D) velocity measurement based on the tomographic reconstruction of a 3D volume light intensity field from multiple two-dimensional projections. A simplification of 3D tomographic reconstruction model, which reduced from a 3D volume with 2D images to a 2D slice with 1D lines, simplify this 3D reconstruction into a problem of 2D plane reconstruction by means of optical tomography, is applied in this paper . The principles and details of the tomographic algorithm are discussed, as well as the study of ART and MART reconstruction algorithm is carried out by means of computer-simulated image reconstruction procedure. The three-dimensional volume particle field is reconstructed by MART reconstruction algorithm base on the simplified 3D reconstruction model which made a high reconstruction quality Q=81.37% prove that the way of simplification by MART reconstruction is feasible, so it could be applied in reconstruction of 3D particle field in tomographic particle image velocimetry system.

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