Results 1 - 10 of 40

Development and validation of MCNP4C-based Monte Carlo simulator for fan-and cone-beam x-ray CT

by Mohammad Reza Ay, Habib Zaidi - Phys M Biol
"... An x-ray computed tomography (CT) simulator based on the Monte Carlo N-particle radiation transport computer code (MCNP4C) was developed for simulation of both fan- and cone-beam CT scanners. A user-friendly interface running under Matlab 6.5.1 creates the scanner geometry at different views as MCNP ..."
Abstract - Cited by 10 (4 self) - Add to MetaCart
An x-ray computed tomography (CT) simulator based on the Monte Carlo N-particle radiation transport computer code (MCNP4C) was developed for simulation of both fan- and cone-beam CT scanners. A user-friendly interface running under Matlab 6.5.1 creates the scanner geometry at different views

1 Ultra-Fast Hybrid CPU-GPU Multiple Scatter Simulation for 3D PET

by Kyung Sang Kim A, Young Don Son B, Zang Hee Cho B, Jong Beom Ra C, Jong Chul Ye A
"... Abstract—Scatter correction is very important in 3D PET reconstruction due to a large scatter contribution in measurements. Currently, one of the most popular methods is so called single scatter simulation (SSS), which considers single Compton scattering contributions from many randomly distributed ..."
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using an HRRT. Index Terms—PET, scatter estimation, Monte Carlo simulation, GPU, CUDA

Ultra-Fast Hybrid CPU–GPU Multiple Scatter Simulation for 3-D PET

by Kyung Sang Kim, Young Don Son, Zang Hee Cho, Jong Beom Ra, Jong Chul Ye
"... Abstract—Scatter correction is very important in 3-D PET re-construction due to a large scatter contribution in measurements. Currently, one of the most popular methods is the so-called single scatter simulation (SSS), which considers single Compton scatter-ing contributions from many randomly distr ..."
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experiments using an HRRT. Index Terms—Compute unified device architecture (CUDA), graphic processor unit (GPU), Monte Carlo (MC) simulation, positron emission tomography (PET), scatter estimation.

Performance Evaluation of Scatter Modeling of the GPU-based “Tera-Tomo ” 3D PET Reconstruction

by unknown authors
"... Abstract—In positron emission tomography (PET), photon scattering inside the body causes significant blurring and quan-tification error in the reconstructed images. To solve this problem we have developed Monte Carlo (MC) based 3D PET recon-struction algorithms implemented on the Graphics Processing ..."
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implementation of the Philips Gemini TOF PET which applies attenuation correction and single scatter simulation (SSS) for scatter correction. The comparative reconstruction results are based on the NEMA NU2-2007 image quality phantom. I.

Comparative evaluation of two commercial PET scanners, ECAT EXACT HR+ and Biograph 2, using GATE

by N Karakatsanis , N Sakellios , N X Tsantilas , N Dikaios , C Tsoumpas , D Lazaro , G Loudos , C R Schmidtlein , K Louizi , J Valais , D Nikolopoulos , J Malamitsi , J Kandarakis , K Nikita , 2006
"... Abstract Geant4 application for tomographic emission (GATE) is a generic Monte Carlo simulation platform based on a general-purpose code GEANT4 and designed to simulate positron emission tomography (PET) and single photon emission tomography systems. Monte Carlo simulations are used in nuclear medi ..."
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Abstract Geant4 application for tomographic emission (GATE) is a generic Monte Carlo simulation platform based on a general-purpose code GEANT4 and designed to simulate positron emission tomography (PET) and single photon emission tomography systems. Monte Carlo simulations are used in nuclear

Effective scattering coefficient of the cerebral spinal fluid in adult head models for diffuse optical imaging

by Anna Custo, William M. Wells Iii, Alex H. Barnett, Elizabeth M. C. Hillman, David A. Boas - Appl Opt , 2006
"... Efficient computation of the time-dependent forward solution for photon transport in a head model is a key capability for performing accurate inversion for functional Diffuse Optical Imaging (DOI) of the brain. The diffusion approximation to photon transport is much faster to simulate than the physi ..."
Abstract - Cited by 11 (2 self) - Add to MetaCart
pathlengths relevant for functional measurements. We demonstrate this in detail using Monte Carlo simulation of the RTE in a three-dimensional head model based on clinical MRI data, with realistic optode geometries. Our findings lead us to expect that the diffusion approximation will be valid even

CORRECTING FOR PRECIPITATION EFFECTS IN SATELLITE-BASED PASSIVE MICROWAVE TROPICAL CYCLONE INTENSITY ESTIMATES

by Capt Wacker Robert S, Robert S. Wacker , 2005
"... Public reporting burden for this collection of Information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments ..."
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Public reporting burden for this collection of Information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this

Performance characteristics of the 3-D OSEM algorithm in the reconstruction of small animal PET images

by Rutao Yao, Jürgen Seidel, Calvin A. Johnson, Margaret E. Daube-witherspoon, Michael V. Green, Richard E. Carson - IEEE Trans Med Imaging
"... Abstract—Rat brain images acquired with a small animal positron emission tomography (PET) camera and reconstructed with the three-dimensional (3-D) ordered-subsets expecta-tion-maximization (OSEM) algorithm with resolution recovery have better quality when the brain is imaged by itself than when ins ..."
Abstract - Cited by 9 (2 self) - Add to MetaCart
inside the head with surrounding background activity. The purpose of this study was to characterize the dependence of this effect on the level of background activity, attenuation, and scatter. Monte Carlo simulations of the imaging system were performed. The coefficient of variation from replicate images

Evaluation of the CANDU 6 Neutron Characteristics in View of Application of the Resonance Dependent Scattering Kernel in MCNP(X)

by Ron Dagan , Björn Becker , Dan Roubtsov , 2011
"... This study continues our investigation of the influence of the resonant scattering kernel on different reactor types and, in particular, different moderators and coolants. The importance of an advanced neutron scattering treatment for heavy nuclei with strong energy-dependent cross sections, such a ..."
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® 6. In modeling nuclear reactors with Monte Carlo methods, we take advantage of the stochastic implementation of the resonant scattering kernel directly in MCNP(X), the so-called Doppler Broadening Rejection Correction -DBRC, which allows the direct calculation of the differential part of the Doppler

unknown title

by unknown authors
"... rently, attention is focused on scatter removal from emis sion studies since scatter-free transmission scans can, in principle, be obtained using a rotating rod source with windowed data acquisition (4). Alternatively, scatter-free attenuation correction factors (ACFs) for brain studies can be obtai ..."
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configurations can be simulated by Monte-Carlo techniques, but this is a slow, computer intensive procedure which requires accu rate modeling of the PET system (7—9).We have devel oped a new method which utilizes an additional short data
Results 1 - 10 of 40