Evaluation of metal artifacts in MVCT systems using a model based correction method

2012 ◽  
Vol 39 (10) ◽  
pp. 6297-6308 ◽  
Author(s):  
M. R. Paudel ◽  
M. Mackenzie ◽  
B. G. Fallone ◽  
S. Rathee
Keyword(s):  
Correction Method ◽  
Metal Artifacts ◽  
Model Based

scholarly journals Model-Based Slippage Estimation to Enhance Planetary Rover Localization with Wheel Odometry

2021 ◽  
Vol 11 (12) ◽  
pp. 5490
Author(s):  
Anna Maria Gargiulo ◽  
Ivan di Stefano ◽  
Antonio Genova
Keyword(s):  
Inertial Measurement Unit ◽  
Correction Method ◽  
Harsh Environments ◽  
Measurement Unit ◽  
Planetary Rovers ◽  
Model Based ◽  
Accurate Knowledge ◽  
And Control ◽  
Wheeled Vehicles ◽  
Rover Localization

The exploration of planetary surfaces with unmanned wheeled vehicles will require sophisticated software for guidance, navigation and control. Future missions will be designed to study harsh environments that are characterized by rough terrains and extreme conditions. An accurate knowledge of the trajectory of planetary rovers is fundamental to accomplish the scientific goals of these missions. This paper presents a method to improve rover localization through the processing of wheel odometry (WO) and inertial measurement unit (IMU) data only. By accurately defining the dynamic model of both a rover’s wheels and the terrain, we provide a model-based estimate of the wheel slippage to correct the WO measurements. Numerical simulations are carried out to better understand the evolution of the rover’s trajectory across different terrain types and to determine the benefits of the proposed WO correction method.

Division model-based distortion correction method for head-mounted displays

2019 ◽  
Vol 27 (3) ◽  
pp. 172-180 ◽  
Author(s):  
Xue Xiao ◽  
Lin Zhang ◽  
Xiao Lin ◽  
Jinliang Zang ◽  
Xiaodi Tan
Keyword(s):  
Correction Method ◽  
Distortion Correction ◽  
Model Based ◽  
Head Mounted Displays ◽  
Division Model

Model-Based Iterative Reconstruction (MBIR) for the Reduction of Metal Artifacts on CT

2015 ◽  
Vol 205 (2) ◽  
pp. 380-385 ◽  
Author(s):  
Sana Boudabbous ◽  
Daniel Arditi ◽  
Emilie Paulin ◽  
Aphrodite Syrogiannopoulou ◽  
Christoph Becker ◽  
...  
Keyword(s):  
Iterative Reconstruction ◽  
Metal Artifacts ◽  
Model Based

Determination of the Heat Release Distribution in Turbulent Flames by a Model Based Correction of OH* Chemiluminescence

2011 ◽  
Vol 133 (12) ◽  
Author(s):  
Martin Lauer ◽  
Mathieu Zellhuber ◽  
Thomas Sattelmayer ◽  
Christopher J. Aul
Keyword(s):  
Strain Rate ◽  
Heat Release ◽  
Heat Release Rate ◽  
Release Rate ◽  
Correction Method ◽  
Turbulent Flames ◽  
Lookup Table ◽  
Rate Model ◽  
Model Based

Imaging of OH* or CH* chemiluminescence with intensified cameras is often employed for the determination of heat release in premixed flames. Proportionality is commonly assumed, but in the turbulent case this assumption is not justified. Substantial deviations from proportionality are observed, which are due to turbulence-chemistry interactions. In this study a model based correction method is presented to obtain a better approximation of the spatially resolved heat release rate of lean turbulent flames from OH* measurements. The correction method uses a statistical strain rate model to account for the turbulence influence. The strain rate model is evaluated with time-resolved velocity measurements of the turbulent flow. Additionally, one-dimensional simulations of strained counterflow flames are performed to consider the nonlinear effect of turbulence on chemiluminescence intensities. A detailed reaction mechanism, which includes all relevant chemiluminescence reactions and deactivation processes, is used. The result of the simulations is a lookup table of the ratio between heat release rate and OH* intensity with strain rate as parameter. This lookup table is linked with the statistical strain rate model to obtain a correction factor which accounts for the nonlinear relationships between OH* intensity, heat release rate, and strain rate. The factor is then used to correct measured OH* intensities to obtain the local heat release rate. The corrected intensities are compared to heat release distributions which are measured with an alternative method. For all investigated flames in the lean, partially premixed regime the corrected OH* intensities are in very good agreement with the heat release rate distributions of the flames.

Reduction of metal artifacts due to dental hardware in computed tomography angiography: assessment of the utility of model-based iterative reconstruction

2017 ◽  
Vol 59 (3) ◽  
pp. 231-235 ◽  
Author(s):  
Keita Kuya ◽  
Yuki Shinohara ◽  
Ayumi Kato ◽  
Makoto Sakamoto ◽  
Masamichi Kurosaki ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Iterative Reconstruction ◽  
Computed Tomography Angiography ◽  
Metal Artifacts ◽  
Model Based

A correction method for the near field approximated model based localization techniques

2017 ◽  
Vol 67 ◽  
pp. 76-80 ◽  
Author(s):  
Parth Raj Singh ◽  
Yide Wang ◽  
Pascal Chargé
Keyword(s):  
Near Field ◽  
Correction Method ◽  
Model Based

scholarly journals Whole-Body PET/MR Imaging: Quantitative Evaluation of a Novel Model-Based MR Attenuation Correction Method Including Bone

2015 ◽  
Vol 56 (7) ◽  
pp. 1061-1066 ◽  
Author(s):  
D. H. Paulus ◽  
H. H. Quick ◽  
C. Geppert ◽  
M. Fenchel ◽  
Y. Zhan ◽  
...  
Keyword(s):  
Mr Imaging ◽  
Attenuation Correction ◽  
Quantitative Evaluation ◽  
Correction Method ◽  
Whole Body ◽  
Model Based ◽  
Novel Model
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