نتایج جستجو برای: mlem algorithm

تعداد نتایج: 754023  

Journal: :I. J. Functional Informatics and Personalised Medicine 2008
Weihua Zhou Apuroop Balla Ying Chen

Digital Breast Tomosynthesis (DBT) is a novel imaging technology to improve early breast cancer detection. It provides three-dimensional information of the breast to overcome the critical issues of overlapping anatomical structures of the breast. Among current available DBT reconstruction algorithms, Maximum Likelihood Expectation-Maximisation (MLEM) is a time-consuming iterative method to reco...

2006
G. Shakirin

At the experimental heavy ion tumor therapy facility at the GSI Darmstadt in-beam PET is operated. The in-beam PET data should be reconstructed as fast as possible (ideally, in real time), because they allow monitoring irregularities in beam delivery. To find a fast reconstruction algorithm with acceptable quality, MLEM [1] and OSEM [2] algorithms were compared for full-ring and dual-head geome...

2009
Tilman Küstner Josef Weidendorfer Jasmine Schirmer Tobias Klug Carsten Trinitis Sybille Ziegler

The efficient use of multicore architectures for sparse matrixvector multiplication (SpMV) is currently an open challenge. One algorithm which makes use of SpMV is the maximum likelihood expectation maximization (MLEM) algorithm. When using MLEM for positron emission tomography (PET) image reconstruction, one requires a particularly large matrix. We present a new storage scheme for this type of...

2007
Roel Van Holen Stefaan Vandenberghe Steven Staelens Yves D’Asseler Ignace Lemahieu

As an alternative to the use of traditional parallel hole collimators, SPECT imaging can be performed using rotating slat collimators. A gain in image quality could be expected from the higher photon collection efficiency, however, the plane integral data measured by this type of collimator require a reconstruction to invert the three-dimensional (3D) Radon transform. The use of iterative metho...

Journal: :Bio-Algorithms and Med-Systems 2014
Piotr Bialas Jakub Kowal Adam Strzelecki Tomasz Bednarski Eryk Czerwinski Krzysztof Giergiel Lukasz Kaplon Andrzej Kochanowski Grzegorz Korcyl Pawel Kowalski Tomasz Kozik Wojciech Krzemien Marcin Molenda Ines Moskal Pawel Moskal Szymon Niedzwiecki Marek Palka Monika Pawlik-Niedzwiecka Lech Raczynski Zbigniew Rudy Piotr Salabura Neha Gupta-Sharma Michal Silarski Artur Slomski Jerzy Smyrski Konrad Szymanski Wojciech Wislicki Piotr Witkowski Marcin Zielinski Natalia Zon

Using a theory of list-mode maximum likelihood expectation-maximization (MLEM) algorithm, in this contribution, we present a derivation of the system response kernel for a novel positron emission tomography (PET) detector based on plastic scintillators.

Journal: :NeuroImage 2017
Abolfazl Mehranian Habib Zaidi Andrew J. Reader

With the advent of time-of-flight (TOF) PET scanners, joint maximum-likelihood reconstruction of activity and attenuation (MLAA) maps has recently regained attention for the estimation of PET attenuation maps from emission data. However, the estimated attenuation and activity maps are scaled by unknown scaling factors. We recently demonstrated that in hybrid PET-MR, the scaling issue of this al...

Journal: :J. Electronic Imaging 2015
Weihua Zhou Jianping Lu Otto Zhou Ying Chen

As a breast-imaging technique, digital breast tomosynthesis has great potential to improve the diagnosis of early breast cancer over mammography. Ray-tracing-based reconstruction algorithms, such as ray-tracing back projection, maximum-likelihood expectation maximization (MLEM), ordered-subset MLEM (OS-MLEM), and simultaneous algebraic reconstruction technique (SART), have been developed as rec...

2015
Tsutomu Gomi

We compared reconstruction algorithms [filtered back projection (FBP), maximum likelihood expectation maximization (MLEM), and the simultaneous iterative reconstruction technique (SIRT)] in terms of the radiation dose and image quality, for exploring the possibility of decreasing the radiation dose during digital breast tomosynthesis (DBT). The three algorithms were implemented using a DBT syst...

Journal: :Physics in medicine and biology 2013
Paul A Wolf Jakob S Jørgensen Taly G Schmidt Emil Y Sidky

A sparsity-exploiting algorithm intended for few-view single photon emission computed tomography (SPECT) reconstruction is proposed and characterized. The algorithm models the object as piecewise constant subject to a blurring operation. To validate that the algorithm closely approximates the true object in the noiseless case, projection data were generated from an object assuming this model an...

Journal: :Journal of nuclear medicine : official publication, Society of Nuclear Medicine 2000
D S Lalush B M Tsui

UNLABELLED We studied the bias and variance characteristics of the ordered-subset expectation maximization (OSEM) and rescaled block-iterative EM (RBIEM) iterative reconstruction algorithms in myocardial SPECT under extreme, but realistic, conditions. METHOD We used the 2-dimensional mathematic cardiac torso phantom to simulate 2 patient anatomies: a large male with a raised diaphragm and a f...

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