scholarly journals MEGAVOLTAGE COMPUTED TOMOGRAPHY (MVCT) DOSE ASSESSMENT AT DIFFERENT DEPTHS

2019 ◽  
Author(s):  
Sibel Karaca ◽  
Hamit Başaran
Keyword(s):  
Computed Tomography ◽  
Dose Assessment ◽  
Megavoltage Computed Tomography ◽  
Different Depths

scholarly journals Improved contrast and noise of megavoltage computed tomography (MVCT) through cycle‐consistent generative machine learning

2020 ◽  
Author(s):  
Luciano Vinas ◽  
Jessica Scholey ◽  
Martina Descovich ◽  
Vasant Kearney ◽  
Atchar Sudhyadhom
Keyword(s):  
Machine Learning ◽  
Computed Tomography ◽  
Megavoltage Computed Tomography

scholarly journals Fast Megavoltage Computed Tomography: A Rapid Imaging Method for Total Body or Marrow Irradiation in Helical Tomotherapy

2016 ◽  
Vol 96 (3) ◽  
pp. 688-695 ◽  
Author(s):  
Taiki Magome ◽  
Akihiro Haga ◽  
Yutaka Takahashi ◽  
Keiichi Nakagawa ◽  
Kathryn E. Dusenbery ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Helical Tomotherapy ◽  
Imaging Method ◽  
Rapid Imaging ◽  
Megavoltage Computed Tomography ◽  
Total Body

scholarly journals Design of a Monte Carlo model based on dual-source computed tomography (DSCT) scanners for dose and image quality assessment using the Monte Carlo N-Particle (MCNP5) code

2020 ◽  
Vol 26 (1) ◽  
pp. 11-20
Author(s):  
Stefania Chantzi ◽  
Emmanouil Papanastasiou ◽  
Christina Athanasopoulou ◽  
Elisavet Molyvda-Athanasopoulou ◽  
Panagiotis Bamidis ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Monte Carlo ◽  
Monte Carlo Model ◽  
Dose Assessment ◽  
Projection Algorithm ◽  
Projection Data ◽  
Ct Number ◽  
Low Contrast ◽  
Dual Source ◽  
Dual Source Computed Tomography

AbstractThe purpose of this work was to develop and validate a Monte Carlo model for a Dual Source Computed Tomography (DSCT) scanner based on the Monte Carlo N-particle radiation transport computer code (MCNP5). The geometry of the Siemens Somatom Definition CT scanner was modeled, taking into consideration the x-ray spectrum, bowtie filter, collimator, and detector system. The accuracy of the simulation from the dosimetry point of view was tested by calculating the Computed Tomography Dose Index (CTDI) values. Furthermore, typical quality assurance phantoms were modeled in order to assess the imaging aspects of the simulation. Simulated projection data were processed, using the MATLAB software, in order to reconstruct slices, using a Filtered Back Projection algorithm. CTDI, image noise, CT-number linearity, spatial and low contrast resolution were calculated using the simulated test phantoms. The results were compared using several published values including IMPACT, NIST and actual measurements. Bowtie filter shapes are in agreement with those theoretically expected. Results show that low contrast and spatial resolution are comparable with expected ones, taking into consideration the relatively limited number of events used for the simulation. The differences between simulated and nominal CT-number values were small. The present attempt to simulate a DSCT scanner could provide a powerful tool for dose assessment and support the training of clinical scientists in the imaging performance characteristics of Computed Tomography scanners.

Metal artifact suppression in megavoltage computed tomography

2005 ◽  
Author(s):  
L. John Schreiner ◽  
Myron Rogers ◽  
Greg Salomons ◽  
Andrew Kerr
Keyword(s):  
Computed Tomography ◽  
Metal Artifact ◽  
Megavoltage Computed Tomography ◽  
Artifact Suppression

Radiation dose assessment of 64 Multi-Slices Computed Tomography scanner

2021 ◽  
Vol 178 ◽  
pp. 108904
Author(s):  
R.S. Omar ◽  
S. Hashim ◽  
S.K. Ghoshal ◽  
D.A. Bradley ◽  
N.D. Shariff
Keyword(s):  
Computed Tomography ◽  
Radiation Dose ◽  
Dose Assessment ◽  
Radiation Dose Assessment ◽  
Computed Tomography Scanner

Performance characterization of megavoltage computed tomography imaging on a helical tomotherapy unit

2005 ◽  
Vol 32 (8) ◽  
pp. 2673-2681 ◽  
Author(s):  
Sanford L. Meeks ◽  
Joseph F. Harmon ◽  
Katja M. Langen ◽  
Twyla R. Willoughby ◽  
Thomas H. Wagner ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Helical Tomotherapy ◽  
Computed Tomography Imaging ◽  
Performance Characterization ◽  
Tomography Imaging ◽  
Megavoltage Computed Tomography
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