Filters








489 Hits in 4.4 sec

Spatiotemporal Decomposition in Object-Space along Reconstruction in Emission Tomography [chapter]

Xavier Hubert, Dominique Chambellan, Samuel Legoupil, Régine Trébossen, Jean-Robert Deverre, Nikos Paragios
2008 Lecture Notes in Computer Science  
Emission tomography has provided a new insight in brain mechanisms past years. Although reconstructions are nowadays mostly static, trend is going toward dynamic acquisitions and reconstructions.  ...  Results are very promising, since it estimates arterial input function accurately although object emits just a limited amount of photons, especially within the first minutes.  ...  It deeply reduces the number of variables and explicitly encodes the temporal correlation in the reconstruction.  ... 
doi:10.1007/978-3-540-85990-1_31 fatcat:6mms7ultprd6hbtvexdwg3bs3u

Hybrid Projection Methods for Solution Decomposition in Large-scale Bayesian Inverse Problems [article]

Julianne Chung, Jiahua Jiang, Scot M. Miller, Arvind K. Saibaba
2022 arXiv   pre-print
Such scenarios arise in many imaging applications (e.g., anomaly detection in atmospheric emissions tomography) where the reconstructed solution can be represented as a combination of two or more components  ...  In a deterministic inversion or inverse modeling framework, these assumptions correspond to different regularization terms for each solution in the sum.  ...  In the top row, we provide the averaged computed reconstruction for sdHybr, along with the average reconstructions for s 1 and s 2 .  ... 
arXiv:2206.06664v1 fatcat:brlhyndccvafvj4udj4lmjcoza

Super-resolution three-dimensional fluorescence and optical diffraction tomography of live cells using structured illumination generated by a digital micromirror device [article]

Seungwoo Shin, Doyeon Kim, Kyoohyun Kim, Yongkeun Park
2018 arXiv   pre-print
the HeLa cell is analyzed using spatiotemporal correlations.  ...  We present a multimodal approach for measuring the three-dimensional (3D) refractive index (RI) and fluorescence distributions of live cells by combining optical diffraction tomography (ODT) and 3D structured  ...  All the authors have financial interests in Tomocube Inc., a company that commercializes ODT and QPI instruments and is one of the sponsors of the work.  ... 
arXiv:1801.00854v1 fatcat:byua2al3wzawdkjy7oloubn4bi

Imaging of turbulent structures and tomographic reconstruction of TORPEX plasma emissivity

D. Iraji, I. Furno, A. Fasoli, C. Theiler
2010 Physics of Plasmas  
The -time and the two-dimensional k-space Fourier analysis of the reconstructed emissivity fluctuations show the same interchange mode that is detected in the and k spectra of the ion saturation current  ...  of equations by singular value decomposition.  ...  THEORETICAL BACKGROUND OF PLASMA TOMOGRAPHY Provided that the plasma is fully transparent to its radiation, the plasma light emission is integrated along lines of sight ͑LOSs͒ passing through different  ... 
doi:10.1063/1.3523052 fatcat:enk5zihadvh6tn4zzmhiber5vu

Direct parametric reconstruction in dynamic PET myocardial perfusion imaging:in vivostudies

Yoann Petibon, Yothin Rakvongthai, Georges El Fakhri, Jinsong Ouyang
2017 Physics in Medicine and Biology  
of the theory of 4D image reconstruction for emission tomography is given along with a review of the current state of the art, covering both positron emission tomography and single photon emission computed  ...  The other crucial components to image reconstruction (the objective function, the system model and the raw data format) are also covered, but in less detail due to the relatively straightforward extension  ...  Acknowledgments This review and research was undertaken, in part, thanks to funding from the Canada Research Chairs program.  ... 
doi:10.1088/1361-6560/aa6394 pmid:28379843 pmcid:PMC5739089 fatcat:gokrwq2x25hrthjjqdcbgaesnq

Tomographic reconstruction of the pulse-echo spatiotemporal impulse response

Nghia Q. Nguyen, Craig K. Abbey, Rebecca D. Yapp, Michael F. Insana, Jan D'hooge, Stephen A. McAleavey
2010 Medical Imaging 2010: Ultrasonic Imaging, Tomography, and Therapy  
The impulse response can also be difficult to predict numerically for a specific device because small unknown perturbations in array properties can generate significant changes in predicted pulse-echo  ...  Virtually every area of ultrasonic imaging research requires accurate estimation of the spatiotemporal impulse response of the instrument, and yet accurate measurements are difficult to achieve.  ...  Projections are linear transformations of the impulse response along lines in space.  ... 
doi:10.1117/12.845736 fatcat:2yfdgrx27vbzhar6mkcm4lps7u

4D image reconstruction for emission tomography

Andrew J Reader, Jeroen Verhaeghe
2014 Physics in Medicine and Biology  
Acknowledgments This review and research was undertaken, in part, thanks to funding from the Canada Research Chairs program.  ...  state of the art in 4D image reconstruction for emission tomography.  ...  Therefore the decomposition should only be seen as a means to reduce noise in the final spatiotemporal image. Shape constraints.  ... 
doi:10.1088/0031-9155/59/22/r371 pmid:25361380 fatcat:dbhq74hapvbcfkkwjn2tkulumi

The meaning of interior tomography

Ge Wang, Hengyong Yu
2013 Physics in Medicine and Biology  
Recently, interior tomography research has led to theoretically exact relationships between localities in the projection and image spaces and practically promising reconstruction algorithms.  ...  The classic imaging geometry for computed tomography is for collection of un-truncated projections and reconstruction of a global image, with the Fourier transform as the theoretical foundation that is  ...  As another example, temperature-modulated bioluminescence tomography utilizes focused ultrasound to heat a small animal body, modulate bioluminescent light emission in vivo, and improve reconstructed image  ... 
doi:10.1088/0031-9155/58/16/r161 pmid:23912256 pmcid:PMC3775479 fatcat:brph56bh55e43pvwq2g4ukg24e

Joint estimation of dynamic PET images and temporal basis functions using fully 4D ML-EM

Andrew J Reader, Florent C Sureau, Claude Comtat, Régine Trébossen, Irène Buvat
2006 Physics in Medicine and Biology  
A fully 4D joint-estimation approach to reconstruction of temporal sequences of 3D positron emission tomography (PET) images is proposed.  ...  In addition to spatial image quality advantages, for smaller regions of interest (where statistical quality is often limited) the reconstructed time-activity curves show a lower level of bias and a lower  ...  Continuing in the context of PET, the object is the PET isotope's spatiotemporal (4D) distribution.  ... 
doi:10.1088/0031-9155/51/21/005 pmid:17047263 fatcat:aidktwty7fgw7azly7yg7fkhnu

Core Imaging Library – Part II: Multichannel reconstruction for dynamic and spectral tomography [article]

Evangelos Papoutsellis, Evelina Ametova, Claire Delplancke, Gemma Fardell, Jakob S. Jørgensen, Edoardo Pasca, Martin Turner, Ryan Warr, William R. B. Lionheart, Philip J. Withers
2021 arXiv   pre-print
We formalise different optimisation problems for colour processing, dynamic and hyperspectral tomography and demonstrate CIL's capabilities for designing state of the art reconstruction methods through  ...  In the first part of this two-part publication, we introduced the fundamentals of CIL. This paper focuses on applications of CIL for multichannel data, e.g., dynamic and spectral.  ...  Emission Tomography (PET).  ... 
arXiv:2102.06126v2 fatcat:vfwguxnj3racfltlvqfqurxgre

Image reconstruction in higher dimensions: myocardial perfusion imaging of tracer dynamics with cardiac motion due to deformation and respiration

Uttam M Shrestha, Youngho Seo, Elias H Botvinick, Grant T Gullberg
2015 Physics in Medicine and Biology  
This work develops a technique for a single photon emission computed tomography (SPECT) that reconstructs the distribution of the radiotracer concentration in the myocardium using a tensor product of different  ...  These results are compared with the conventional 4D-spatiotemporal reconstruction method that models only the temporal changes of the tracer activity.  ...  Defrise for fruitful discussions during the Fully 3D meeting in 2013 at Lake Tahoe, California.  ... 
doi:10.1088/0031-9155/60/21/8275 pmid:26450115 pmcid:PMC4636034 fatcat:d2vx5je6lvht7g2voyo6p2uumi

Extreme MRI: Large-Scale Volumetric Dynamic Imaging from Continuous Non-Gated Acquisitions [article]

Frank Ong, Xucheng Zhu, Joseph Y. Cheng, Kevin M. Johnson, Peder E. Z. Larson, Shreyas S. Vasanawala, Michael Lustig
2020 arXiv   pre-print
Conclusion: We demonstrated a method that can reconstruct massive 3D dynamic image series in the extreme undersampling and extreme computation setting.  ...  Results: The proposed technique shows transient dynamics that are not seen in gating based methods.  ...  Examples include ordered subset algorithms for positron emission tomography reconstruction [46, 47] and the algebraic reconstruction technique for computed tomography [48] . In MRI, Muckley et al.  ... 
arXiv:1909.13482v3 fatcat:orqwdyt2znhx7nypdan26v74im

A multiresolution spatial parameterization for the estimation of fossil-fuel carbon dioxide emissions via atmospheric inversions

J. Ray, V. Yadav, A. M. Michalak, B. van Bloemen Waanders, S. A. McKenna
2014 Geoscientific Model Development  
been limited by the highly heterogeneous and non-Gaussian spatiotemporal variability of emissions.  ...  We finally implement this low-dimensional parameterization within an idealized inversion, where a sparse reconstruction algorithm, an extension of stagewise orthogonal matching pursuit (StOMP), is used  ...  Thanks are due to Sharon Gourdji, Kim Mueller and Abhishek Chatterjee for fruitful discussions regarding algorithms, the challenges of working with field observations as well as some of the data used in  ... 
doi:10.5194/gmd-7-1901-2014 fatcat:dubnfz2665fiffd6kzefqrumte

Direct least-squares estimation of spatiotemporal distributions from dynamic SPECT projections using a spatial segmentation and temporal B-splines

B.W. Reutter, G.T. Gullberg, R.H. Huesman
2000 IEEE Transactions on Medical Imaging  
Index Terms-Dynamic single photon emission computed tomography (SPECT), fully four-dimensional (4-D) reconstruction, kinetic parameter estimation.  ...  Artifacts can result when reconstructing a dynamic image sequence from inconsistent, as well as insufficient and truncated, cone beam single photon emission computed tomography (SPECT) projection data  ...  Some preliminary results of this work were presented in the conference report [33] .  ... 
doi:10.1109/42.870254 pmid:11021687 fatcat:6d2atem2xvagpclii6uzwus3ym

Continuous-variable optical quantum-state tomography

A. I. Lvovsky, M. G. Raymer
2009 Reviews of Modern Physics  
Optical homodyne tomography is reviewed as a method of reconstructing the state of light in a given optical mode.  ...  This review covers latest developments in continuous-variable quantum-state tomography of optical fields and photons, placing a special accent on its practical aspects and applications in quantum information  ...  We thank Gina Howard for assistance in preparing the manuscript.  ... 
doi:10.1103/revmodphys.81.299 fatcat:rqygiib26zhtfb7kj3x2367aja
« Previous Showing results 1 — 15 out of 489 results