Occlusion calculation algorithm for computer generated hologram based on ray tracing

2019 ◽  
Vol 443 ◽  
pp. 76-85 ◽  
Author(s):  
Shuangting Liu ◽  
Hui Wei ◽  
Ni Li ◽  
Zihan Liu ◽  
Jiaqi Zhang
Keyword(s):  
Ray Tracing ◽  
Calculation Algorithm ◽  
Computer Generated Hologram

scholarly journals Comparison of treatment plans calculated by Ray Tracing and Monte Carlo algorithms for head and thorax radiotherapy with Cyberknife

2017 ◽  
Vol 3 (2) ◽  
pp. 647-650 ◽  
Author(s):  
Kirsten Galonske ◽  
Martin Thiele ◽  
Iris Ernst ◽  
Ralph Lehrke ◽  
Waldemar Zylka
Keyword(s):  
Monte Carlo ◽  
Ray Tracing ◽  
Stereotactic Radiotherapy ◽  
Calculation Algorithm ◽  
Monte Carlo Algorithms ◽  
Body Regions ◽  
Calculation Algorithms ◽  
Treatment Plans ◽  
Homogeneous Regions ◽  
Tumor Types

AbstractThis study investigates differences between treatment plans generated by Ray Tracing (RT) and Monte Carlo (MC) calculation algorithms in homogeneous and heterogeneous body regions. Particularly, we focus on the head and on the thorax, respectively, for robotic stereotactic radiotherapy and radiosurgery with Cyberknife. Radiation plans for tumors located in the head and in the thorax region have been calculated and compared to each other in 47 cases and several tumor types.Assuming MC as the algorithm of highest accuracy it is shown that based on selected dose parameters, RT slightly underestimates the dose in homogeneous regions and overestimates in heterogeneous regions. In addition, deviations occur due to tumor size rendering large differences for small tumors. We conclude that dose prescriptions for radiotherapy treatments should differentiate between RT and MC calculation algorithm. This is especially important for small tumors in heterogeneous body regions.

Simple and fast calculation algorithm for computer-generated hologram with wavefront recording plane

2009 ◽  
Vol 34 (20) ◽  
pp. 3133 ◽  
Author(s):  
Tomoyoshi Shimobaba ◽  
Nobuyuki Masuda ◽  
Tomoyoshi Ito
Keyword(s):  
Calculation Algorithm ◽  
Fast Calculation ◽  
Computer Generated Hologram

scholarly journals Simplified Aberration Analysis Method of Holographic Waveguide Combiner

Photonics ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 71
Author(s):  
Wei-Chia Su ◽  
Shao-Kui Zhou ◽  
Bor-Shyh Lin ◽  
Wen-Kai Lin
Keyword(s):  
Image Quality ◽  
Ray Tracing ◽  
Complex Analysis ◽  
Analysis Method ◽  
3D Display ◽  
Ray Tracing Method ◽  
Head Mounted Display ◽  
Computer Generated Hologram ◽  
Display Function ◽  
Tracing Method

Generally, the diffractive waveguide combiner and computer-generated hologram (CGH) technique have the potential to achieve compact head-mounted display (HMD) with a natural 3D display function. However, the diffractive waveguide combiner will degrade the image quality because of aberration. In order to resolve this issue, the complex analysis based on the ray-tracing method is necessary. Since the major aberration of the waveguide combiners is only astigmatism and anamorphic distortion, only these two aberrations were discussed in this paper. Furthermore, two common waveguide structures were discussed here. In total, four formulas were summarized to analyze aberration and anamorphic distortion in these two structures. Finally, the simplified formulas were verified with the commercial ray-tracing software Zemax. The calculated results of the proposed method match the simulation of Zemax software well. Therefore, the aberration of an arbitrary similar diffractive waveguide can be analyzed by the proposed method. This will make the designing process simpler and faster.

scholarly journals Acceleration and expansion of a photorealistic computer-generated hologram using backward ray tracing and multiple off-axis wavefront recording plane methods

2020 ◽  
Vol 28 (23) ◽  
pp. 34994
Author(s):  
Minyuan Sun ◽  
Yuan Yuan ◽  
Yong Bi ◽  
Shuo Zhang ◽  
Jianying Zhu ◽  
...  
Keyword(s):  
Ray Tracing ◽  
Computer Generated Hologram
Sign in / Sign up

Export Citation Format

Share Document