scholarly journals Corrigendum to “Three-dimensional film dosimetry of photon beam in small field sizes and beyond the heterogeneous regions using a GAFchromic films array” [Radiat. Phys. Chem. 166 (2020) 108467]

2021 ◽  
Vol 188 ◽  
pp. 109604
Author(s):  
Zahra Arab-Bafrani ◽  
Leili Mahani ◽  
Alireza Khoshbin-Khoshnazar ◽  
Ahad Zeinali
Keyword(s):  
Three Dimensional ◽  
Photon Beam ◽  
Small Field ◽  
Film Dosimetry ◽  
Gafchromic Films

Three dimensional film dosimetry of photon beam in small field sizes and beyond the heterogeneous regions using a GAFchromic films array

2020 ◽  
Vol 166 ◽  
pp. 108467
Author(s):  
Zahra Arab-Bafrani ◽  
Leili Mahani ◽  
Alireza Khoshbin-Khoshnazar ◽  
Milad Zeinali Kermani
Keyword(s):  
Three Dimensional ◽  
Photon Beam ◽  
Small Field ◽  
Film Dosimetry ◽  
Gafchromic Films

Feasibility Study of the microDiamond Detector for Measurement of Small Field Photon Beam

2014 ◽  
Vol 25 (4) ◽  
pp. 255 ◽  
Author(s):  
Chang Yeol Lee ◽  
Woo Chul Kim ◽  
Hun Jeong Kim ◽  
Young Hoon Ji ◽  
Kum Bae Kim ◽  
...  
Keyword(s):  
Feasibility Study ◽  
Photon Beam ◽  
Small Field

Measurement of Two-Dimensional Photon Beam Distributions Using a Fiber-Optic Radiation Sensor for Small Field Radiation Therapy

2008 ◽  
Vol 55 (5) ◽  
pp. 2632-2636 ◽  
Author(s):  
Bongsoo Lee ◽  
Kyoung Won Jang ◽  
Dong Hyun Cho ◽  
Wook Jae Yoo ◽  
Sang Hun Shin ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Fiber Optic ◽  
Photon Beam ◽  
Small Field ◽  
Two Dimensional ◽  
Optic Radiation ◽  
Radiation Sensor ◽  
Field Radiation

Comparison of three-dimensional conformal irradiation techniques for prostate cancer using a low-energy (6 MV) photon beam

2010 ◽  
Vol 10 (2) ◽  
pp. 91-101
Author(s):  
Christina Armpilia ◽  
Christos Antypas ◽  
Anna Zygogianni ◽  
Myrsini Balafouta ◽  
John Kouvaris ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Treatment Plan ◽  
Three Dimensional ◽  
Low Energy ◽  
Photon Beam ◽  
High Dose ◽  
Prostate Radiotherapy ◽  
Energy Beam ◽  
Dose Volume Histograms ◽  
Femoral Heads

AbstractPurpose: To evaluate composite coplanar and non-coplanar three-dimensional conformal techniques (3D-CRT) for external-beam prostate radiotherapy using a low-energy (6 MV) photon beam.Methods and Materials: For treatment-planning purposes, three different planning target volumes (PTV) were defined for ten patients with prostate cancer and as follows: PTV1 (pelvis), PTV2 (prostate + seminal vesicles + 1 cm margin) and PTV3 (prostate + 1 cm margin). Conformal techniques of 2, 3, 4, 5 (coplanar) and 6 (non-coplanar) field techniques have been considered and combined to produce five different plan combinations (i.e. techniques A, B, C, D and E). Treatment plans were generated with a prescription dose of 75 Gy to PTV3, 65 Gy to PTV2 and 45 Gy to PTV1 and were assessed on the basis of 3D dose distributions and dose-volume histograms (DVHs). Normal tissue-dose constraints for the relevant organs at risk (OARs), that is, rectum, bladder and femoral heads, were also considered.Results: Findings show that all five treatment-plan combinations result in adequate PTV coverage and acceptable OAR irradiated volumes. The greatest rectal spacing in the high-dose region is achieved by technique C; all techniques achieve this, except for technique A, and give approximately the same fraction of volume (of rectum) that receives a dose of 50 Gy (V50) and 60 Gy (V60). When considering the bladder, techniques B, D and E give the best bladder sparing with small absolute differences, whereas technique A results in the lowest dose for femoral heads. Technique E appears to give the best compromise for all three considered OARs, provided the PTV is adequately covered.Conclusions: Even though the optimum photon-beam energy for conformal prostate radiotherapy is greater than 10 MV, our study shows that a good sparing of OAR can be achieved even with a lower-energy beam (6 MV) and the appropriate plan combination and that the dose to prostate can be as high as 75 Gy.

scholarly journals Three-Dimensional Stitching of Binocular Endoscopic Images Based on Feature Points

Photonics ◽  
2021 ◽  
Vol 8 (8) ◽  
pp. 330
Author(s):  
Changjiang Zhou ◽  
Hao Yu ◽  
Bo Yuan ◽  
Liqiang Wang ◽  
Qing Yang
Keyword(s):  
Point Cloud ◽  
Three Dimensional ◽  
Point Clouds ◽  
Field Of View ◽  
Small Field ◽  
Feature Points ◽  
Endoscopic Image ◽  
Left And Right ◽  
Conventional Algorithm ◽  
Small Field Of View

There are shortcomings of binocular endoscope three-dimensional (3D) reconstruction in the conventional algorithm, such as low accuracy, small field of view, and loss of scale information. To address these problems, aiming at the specific scenes of stomach organs, a method of 3D endoscopic image stitching based on feature points is proposed. The left and right images are acquired by moving the endoscope and converting them into point clouds by binocular matching. They are then preprocessed to compensate for the errors caused by the scene characteristics such as uneven illumination and weak texture. The camera pose changes are estimated by detecting and matching the feature points of adjacent left images. Finally, based on the calculated transformation matrix, point cloud registration is carried out by the iterative closest point (ICP) algorithm, and the 3D dense reconstruction of the whole gastric organ is realized. The results show that the root mean square error is 2.07 mm, and the endoscopic field of view is expanded by 2.20 times, increasing the observation range. Compared with the conventional methods, it does not only preserve the organ scale information but also makes the scene much denser, which is convenient for doctors to measure the target areas, such as lesions, in 3D. These improvements will help improve the accuracy and efficiency of diagnosis.

SU-E-T-56: Characterization of OSLDs for Use in Small Field Photon Beam Dosimetry

2013 ◽  
Vol 40 (6Part11) ◽  
pp. 216-216 ◽  
Author(s):  
C Pham ◽  
P Alvarez ◽  
S Kry ◽  
D Luo ◽  
F Stingo ◽  
...  
Keyword(s):  
Photon Beam ◽  
Small Field ◽  
Beam Dosimetry

Poster - 13: Evaluation of an in-house CCD camera film dosimetry imaging system for small field deliveries

2016 ◽  
Vol 43 (8Part2) ◽  
pp. 4938-4938 ◽  
Author(s):  
Michel Lalonde ◽  
Kevin Alexander ◽  
Tim Olding ◽  
L. John Schreiner ◽  
Andrew T. Kerr
Keyword(s):  
Imaging System ◽  
Ccd Camera ◽  
Small Field ◽  
Film Dosimetry
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