Evaluation of entrance window deformation in water phantom with window thickness of 5 mm for horizontal beam measurements

2021 ◽  
Author(s):  
Takahiro Kato ◽  
Hisanori Sakagami ◽  
Naoki Kinoshita ◽  
Hiroshi Oguchi
Keyword(s):  
Entrance Window ◽  
Water Phantom ◽  
Horizontal Beam

Physical approach to depth dose distributions in a water phantom irradiated by a teleisotope photon beam

1980 ◽  
Vol 7 (2) ◽  
pp. 120-126 ◽  
Author(s):  
Sain D. Ahuja ◽  
Steven L. Stroup ◽  
Marion G. Bolin ◽  
S. Julian Gibbs
Keyword(s):  
Photon Beam ◽  
Dose Distributions ◽  
Water Phantom ◽  
Depth Dose ◽  
Physical Approach

Measurement of the Spectral Distribution of Scattered 400 kVp X Rays in a Water Phantom

1957 ◽  
Vol 30 (351) ◽  
pp. 129-135 ◽  
Author(s):  
D. V. Cormack ◽  
T. J. Griffith ◽  
H. E. Johns
Keyword(s):  
Spectral Distribution ◽  
X Rays ◽  
Water Phantom

Erratum: Physical approach to depth dose distributions in a water phantom irradiated by a teleisotope photon beam [Med. Phys. 7 , 120 (1980)]

1980 ◽  
Vol 7 (5) ◽  
pp. 550-550
Author(s):  
Sain D. Ahuja ◽  
Steven L. Stroup ◽  
Marion G. Bolin ◽  
S. Julian Gibbs
Keyword(s):  
Photon Beam ◽  
Dose Distributions ◽  
Water Phantom ◽  
Depth Dose ◽  
Physical Approach

scholarly journals Settlement Force on a Beam in Snowpack by Computer Modelling

1985 ◽  
Vol 6 ◽  
pp. 95-99
Author(s):  
Theodore E. Lang ◽  
Hideomi Nakamura ◽  
Osamu Abe
Keyword(s):  
Snow Depth ◽  
Viscoelastic Properties ◽  
Computer Modelling ◽  
The Other ◽  
Secondary Creep ◽  
Test Beam ◽  
Shear Transfer ◽  
Horizontal Beam ◽  
Bearing Force ◽  
Extensive Experimental Data

Computer analysis is carried out to predict the force that bears upon a horizontal beam embedded in settling snowpack. Use is made of extensive experimental data on snow depth, layering and density, and on measured force on a test beam, in order to evaluate the internal structural arrangement in a finite element representation of the region in the vicinity of the beam. The compressive secondary-creep viscoelastic properties and the densification properties of the snow are accounted for in the computer modelling. Results show that the bearing force on the beam develop from direct snow weight, from shear transfer by adjacent snowpack, from basal weakening below and to the side of the beam, and from snow densification above and to the side of the beam producing a bridging mechanism. These findings corroborate with related experimental results and point out the need for further refinement in definition, particularly of the bridging mechanism, which produces large force incrementation on the beam compared to the other mechanisms noted.

scholarly journals Fast MCsquare-Based Independent Dose Verification Platform for Pencil Beam Scanning Proton Therapy

2021 ◽  
Vol 20 ◽  
pp. 153303382110330
Author(s):  
Chunbo Liu ◽  
Meng Wei Ho ◽  
Jiyeon Park ◽  
Wen Chien Hsi ◽  
Xiaoying Liang ◽  
...  
Keyword(s):  
Proton Therapy ◽  
Treatment Plan ◽  
Dose Calculation ◽  
Pencil Beam ◽  
Dose Verification ◽  
Beam Scanning ◽  
Water Phantom ◽  
Pencil Beam Scanning ◽  
The Absolute ◽  
Clinical Cases

Purpose: To commission MCsquare (a multi-cores CPU-based dose calculation engine) for pencil beam scanning (PBS) proton therapy, integrate it into RayStation treatment plan system (TPS) to create a dedicated platform for fast independent dose verification. Method: A MCsquare-based independent dose verification platform (MC2InRS) was developed to realize automatic dose re-calculation for clinical use, including data preparation, dose calculation, 2D/3D gamma analysis. MCsquare was commissioned based on in-air lateral dose profiles, integrated depth dose, and the absolute dose of different beam energies for Proteus®ONE. MC2InRS was validated with measurement data using various targets and depths in a water phantom. This study also investigated 15 clinical cases to demonstrate the feasibility and effectiveness of MC2InRS platform in clinic practice. Results: Between simulation and measurement, the distal range differences at 80% (R80) and 20% (R20) dose levels for each energy were below 0.05 mm, and 0.1 mm, respectively, and the absolute dose differences were below 0.5%. 29 out of 36 QA planes reached a 100% gamma passing rate (GPR) for 2%/2mm criteria, and a minimum of 98.3% gamma was obtained in water phantom between simulation and measurement. For the 15 clinical cases investigated, the average 2D GPR (2%/2mm) was 95.4%, 99.3% for MCsquare vs. measurement, MCsquare vs. TPS, respectively. The average 3D GPR (2%/2mm) was 98.9%, 95.3% for MCsquare vs. TPS in water, and computed tomography (CT), respectively. Conclusion: MC2InRS, a fast, independent dose verification platform, has been developed to perform dose verification with high accuracy and efficiency for Pencil Bream Scanning (PBS). Its potential to be applied in routine clinical practice has also been discussed.

scholarly journals Laser entrance window transmission and reflection measurements for preheating in magnetized liner inertial fusion

2018 ◽  
Vol 25 (6) ◽  
pp. 062704 ◽  
Author(s):  
J. R. Davies ◽  
R. E. Bahr ◽  
D. H. Barnak ◽  
R. Betti ◽  
M. J. Bonino ◽  
...  
Keyword(s):  
Inertial Fusion ◽  
Entrance Window ◽  
Transmission And Reflection

scholarly journals Commissioning Measurements of Electron Beam Using Montecarlo Algorithm on Truebeam STx® and Compariaon with Clinac iX Linear Accelerator

2021 ◽  
Vol 229 ◽  
pp. 01041
Author(s):  
Kamal Saidi ◽  
Redouane El Baydaoui ◽  
Hanae El Gouach ◽  
Othmane Kaanouch ◽  
Mohamed Reda Mesradi
Keyword(s):  
Electron Beam ◽  
Electron Beams ◽  
Measured Data ◽  
University Hospital ◽  
Field Size ◽  
Large Field ◽  
Water Phantom ◽  
Depth Dose ◽  
International University ◽  
The Absolute

TrueBeam STx latest generation linear accelerators (linacs) installed at Sheikh Khalifa International University Hospital in Casablanca, Morocco. The aim of this is to present and compare the result of the Electron commissioning measurement on TrueBeam Stx and clinac iX installed at Sheikh Khalifa International University Hospital in Casablanca, Morocco. A compariaon of eMC calculations and measurements for TrueBeam Stx were evaluated. Dosimetric parameters are systematically measured using a large water phantom 3D scanning system MP3 Water Phantom (PTW, Freiburg, Germany). The data of the electron beams commissioning including depth dose curves for each applicator, depth dose curves without applicator and the profile in air for a large field size 40x 40cm2, and the Absolute Dose (cGy/MU) for each applicator. All the data were examined and compared for five electron beams (E6MeV, E9MeV, E12MeV, E16MeV and E20MeV) of Varian’s TrueBeam STx and Clinac iX machines. A comparison, between measurement PDDs and calculated by the Eclipse electron Monte Carlo (eMC) algorithm were performed to validate Truebeam Stx commissioning. All this measurements were performed with a Roos and Markus plane parallel chamber. Our measured data indicated that electron beam PDDs from the TrueBeam Stx machine are well matched to those from our Varian Clinac iX machine. Significant differences between TrueBeam and Clinac iX were found in in‐air profiles and open field output. Maximum depth dose for the TrueBeam Stx and Clinac iX for the following energies (6, 9, 12, 16, 20 MeV) are respectively (1.15; 1.89; 2.6; 3.1; and 2.35) and (1.24; 1.95; 2.70; 2.99 and 2.4cm). For the TrueBeam Stx and Clinac iX the quality index R50 for applicator 15x15 cm2 are in the tolerance intervals. Surface dose increases by increasing energy for both machines. The Absolute Dose (cGy/MU) calibrated for both machine in Dmax at 1cGy/MU for the reference field size cone 15x15 cm2. Bremsstrahlung tail Rp per energy levels as follows for the TrueBeam Stx : 6 MeV – 2.85 cm, 9 MeV – 4.28 cm, 12 MeV – 5.97 cm, 16 MeV – 7.88 cm and 20 MeV – 9.86 cm. and for the Clinac iX : 6 MeV – 2.86 cm, 9 MeV – 4.32 cm, 12 MeV – 5.96 cm, 16 MeV – 7.93 cm and 20 MeV – 10.08 cm. A good agreement between modeled and measured data is observed.

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