SU-GG-T-280: Dose Characteristics and Applications of Optically Stimulated Luminescent Dosimeters in Proton, Electron and Photon Radiotherapy

2008 ◽  
Vol 35 (6Part13) ◽  
pp. 2789-2789
Author(s):  
C Reft
Keyword(s):  
Optically Stimulated Luminescent Dosimeters ◽  
Electron And Photon ◽  
Photon Radiotherapy

Microtrons for Electron and Photon Radiotherapy

1981 ◽  
Vol 28 (2) ◽  
pp. 1880-1883 ◽  
Author(s):  
A. Brahme ◽  
D. Reistad
Keyword(s):  
Electron And Photon ◽  
Photon Radiotherapy

scholarly journals Comparison of Photon-electron and Photon Radiotherapy for Supraclavicular Lymph Nodes of Mastectomy Patients with Left-sided Breast Cancer

2020 ◽  
Vol 25 (1) ◽  
pp. 48-54
Author(s):  
Mehran Mohseni ◽  
Fatholah Mohaghegh ◽  
Nasrin Robatmili ◽  
Mohammad Reza Bayatiani ◽  
Fatemeh Seif ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Lymph Nodes ◽  
Supraclavicular Lymph Nodes ◽  
Electron And Photon ◽  
Photon Radiotherapy

scholarly journals Magnetic confinement of electron and photon radiotherapy dose: A Monte Carlo simulation with a nonuniform longitudinal magnetic field

2005 ◽  
Vol 32 (12) ◽  
pp. 3810-3818 ◽  
Author(s):  
Yu Chen ◽  
Alex F. Bielajew ◽  
Dale W. Litzenberg ◽  
Jean M. Moran ◽  
Frederick D. Becchetti
Keyword(s):  
Magnetic Field ◽  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Longitudinal Magnetic Field ◽  
Magnetic Confinement ◽  
Radiotherapy Dose ◽  
Electron And Photon ◽  
Photon Radiotherapy

Radiation-induced surface decomposition

1983 ◽  
Vol 41 ◽  
pp. 368-369
Author(s):  
M. L. Knotek
Keyword(s):  
Ionizing Radiation ◽  
Atomic Structure ◽  
Chemical Bonding ◽  
Neutral Species ◽  
Radiation Induced ◽  
Physical And Chemical ◽  
Surface Decomposition ◽  
The Relationship ◽  
Electron And Photon ◽  
Surface Bond

Modern surface analysis is based largely upon the use of ionizing radiation to probe the electronic and atomic structure of the surfaces physical and chemical makeup. In many of these studies the ionizing radiation used as the primary probe is found to induce changes in the structure and makeup of the surface, especially when electrons are employed. A number of techniques employ the phenomenon of radiation induced desorption as a means of probing the nature of the surface bond. These include Electron- and Photon-Stimulated Desorption (ESD and PSD) which measure desorbed ionic and neutral species as they leave the surface after the surface has been excited by some incident ionizing particle. There has recently been a great deal of activity in determining the relationship between the nature of chemical bonding and its susceptibility to radiation damage.

Proton vs. photon radiotherapy for MR-guided dose escalation of intraprostatic lesions

2021 ◽  
pp. 1-8
Author(s):  
Maryam Moteabbed ◽  
Mukesh Harisinghani ◽  
Harald Paganetti ◽  
Alexei Trofimov ◽  
Hsiao-Ming Lu ◽  
...  
Keyword(s):  
Dose Escalation ◽  
Photon Radiotherapy

scholarly journals Relevance of Combined Electron and Photon Beams in Radiotherapy of Head and Neck Cancers in the Era of Intensity-Modulated Radiotherapy

2020 ◽  
Author(s):  
Vinod Pandey ◽  
K. C. Pandey ◽  
N. K. Pant ◽  
L. P. Verma
Keyword(s):  
Head And Neck ◽  
Electron Beams ◽  
External Beam Radiotherapy ◽  
Intensity Modulated Radiotherapy ◽  
Modern Technology ◽  
Head And Neck Cancers ◽  
Photon Beams ◽  
Average Percentage ◽  
Intensity Modulated ◽  
Electron And Photon

Abstract Introduction External beam radiotherapy (EBRT) for head and neck (H&N) cancers continues to be delivered using varied technologies, ranging from the old two-dimensional conventional radiotherapy (2DRT) techniques to the modern three-dimensional conformal radiotherapy (3DCRT), intensity-modulated radiotherapy (IMRT), and volumetric modulated arc therapy (VMAT) in different centers in India. Due to limitations of spinal cord tolerance, electron and photon beams are combined in 2DRT and 3DCRT techniques for treating nodal volume of the H&N cases. However, many centers having modern technology practice IMRT/VMAT in place of electron beams. The purpose of this study is to analyze the role of combined electron and photon beams in radiotherapy of H&N cancers and its relevance in the modern era of IMRT/VMAT. Materials and Methods Data were collected through a survey conducted on cancer centers in India where radiotherapy is being given by 2DRT, 3DCRT, and IMR/VMAT for the treatment of head and neck cancers. Results The mean percentage of H&N (H&N) cases among all cases were 39.2% (standard deviation [SD]: 14.22), out of which 16.63% (SD: 20.83) were treated with a combination of photon and electron beams and 49.73% (SD: 37.41) were treated with IMRT/VMAT. The average percentage of H&N cases of government institutes was 38.39% (SD: 14.11) and that of private institutes was 40.14% (SD: 14.11). Patients treated with photon and electron combination and IMRT/VMAT were 22.19% (SD: 11.24) and 24.05% (SD: 23.99), respectively, in government institutes, and 10.29% (SD: 11.24) and 79.09% (SD: 26.75) in private institutes. Conclusion As per this study, we conclude that despite the availability of IMRT/VMAT, a combination of electron and photon beams is still relevant in India. Since a large proportion of the patients are still treated with the electron and photon combination, it is imperative that further studies on field–junction dosimetry should be conducted to ensure accurate dose delivery.

scholarly journals QOL-01. LONGITUDINAL COMPARISON OF NEUROCOGNITIVE TRAJECTORIES IN PEDIATRIC MEDULLOBLASTOMA PATIENTS TREATED WITH PROTON VERSUS PHOTON RADIOTHERAPY

2020 ◽  
Vol 22 (Supplement_3) ◽  
pp. iii431-iii431
Author(s):  
Lisa Kahalley ◽  
Rachel Peterson ◽  
M Douglas Ris ◽  
Laura Janzen ◽  
M Fatih Okcu ◽  
...  
Keyword(s):  
Working Memory ◽  
Processing Speed ◽  
Parental Education ◽  
Normal Brain ◽  
Treatment Protocols ◽  
Pediatric Medulloblastoma ◽  
Boost Dose ◽  
Perceptual Reasoning ◽  
Photon Radiotherapy ◽  
Over Time

Abstract PURPOSE By reducing dose to normal brain tissue, proton radiotherapy (PRT) may lessen neurocognitive risk traditionally associated with photon radiotherapy (XRT). We examined change in neurocognitive scores over time in pediatric medulloblastoma patients treated with PRT versus XRT. METHODS Neurocognitive scores from 79 patients (37 PRT, 42 XRT) were examined. Patients were treated between 2007–2018 on the same treatment protocols that differed only by craniospinal modality (PRT versus XRT). Change in scores over time since diagnosis were compared between groups. RESULTS Groups were similar on most demographic/clinical variables: sex (67.1% male), age at diagnosis (mean 8.6 years), CSI dose (median 23.4 Gy), length of follow-up (mean 4.3 years), and parental education (mean 14.3 years). Boost dose (p<0.001) and margin (p=0.001) differed between groups. Adjusting for covariates, the PRT group exhibited superior outcomes in global IQ, perceptual reasoning, and working memory versus the XRT group (all p<0.05). The XRT group exhibited significant decline in global IQ, working memory, and processing speed (all p<0.05). The PRT group exhibited stable scores in all domains except processing speed (p=0.003). Posterior fossa syndrome imparted risk independent of modality. CONCLUSION This is the first study comparing neurocognitive trajectories between pediatric patients treated for medulloblastoma with PRT versus XRT on comparable, contemporary protocols. PRT was associated with more favorable neurocognitive outcomes in most domains compared to XRT, although processing speed emerged as vulnerable in both groups. This is the strongest evidence to date of an intellectual sparing advantage with PRT in the treatment of pediatric medulloblastoma.

Optimization of combined electron and photon beams for breast cancer

2004 ◽  
Vol 49 (10) ◽  
pp. 1973-1989 ◽  
Author(s):  
W Xiong ◽  
J Li ◽  
L Chen ◽  
R A Price ◽  
G Freedman ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Photon Beams ◽  
Electron And Photon
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