SU-E-T-381: Evaluation of Calculated Dose Accuracy for Organs-At-Risk Located at Out-Of-Field in a Commercial Treatment Planning System for High Energy Photon Beams Produced From TrueBeam Accelerators

2015 ◽  
Vol 42 (6Part18) ◽  
pp. 3421-3421
Author(s):  
L Wang ◽  
G Ding
Keyword(s):  
Treatment Planning ◽  
Organs At Risk ◽  
High Energy ◽  
Planning System ◽  
Treatment Planning System ◽  
High Energy Photon ◽  
Photon Beams ◽  
Energy Photon ◽  
Calculated Dose ◽  
Dose Accuracy

Selection of gamma analysis acceptance criteria in IMRT QA using Gafchromic EBT3 film dosimetry

2018 ◽  
Vol 18 (02) ◽  
pp. 127-131
Author(s):  
Muhammad Isa Khan ◽  
Muhammad Shakil ◽  
Muhammad Bilal Tahir ◽  
Muhammad Rafique ◽  
Tahir Iqbal ◽  
...  
Keyword(s):  
Intensity Modulated Radiation Therapy ◽  
High Energy ◽  
Planning System ◽  
Treatment Planning System ◽  
Photon Beams ◽  
Energy Photon ◽  
Imrt Qa ◽  
Gamma Analysis ◽  
Varian Medical System ◽  
Selection Of

AbstractBackground and purposeThis study reported the justification and selection of acceptable γ criteria with respect to low (6 MV) and high (15 MV) photon beams for intensity-modulated radiation therapy quality assurance (IMRT QA) using the Gafchromic external beam therapy 3 (EBT3) film.Materials and methodsFive-field step-and-shoot IMRT was used to treat 16 brain IMRT patients using the dual-energy DHX-S linear accelerator (Varian Medical System, Palo Alto, CA, USA). Dose comparisons between computed values of the treatment planning system (TPS) and Gafchromic EBT3 film were evaluated based on γ analysis using the Film QA Pro software. The dose distribution was analysed with gamma area histograms (GAHs) generated using different γ criteria (3%/2 mm, 3%/3 mm and 5%/3 mm) for the 6 and 15 MV photon beams, to optimise the best distance-to-agreement (DTA) criteria with respect to the beam energy.ResultsFrom the comparison between the dose distributions acquired from the TPS and EBT3 film, a DTA criterion of 3%/2 mm showed less dose differences (DDs) with passing rates up to 93% for the 6 MV photon beams, while for the 15 MV a relaxed DTA criterion of 5%/3 mm was consistent with the DD acceptability criteria with a 95% passing rate.ConclusionsOur results suggested that high-energy photon beams required relaxed DTA criteria for the brain IMRT QA, while low-energy photon beams showed better results even with tight DTA criteria.

scholarly journals Evaluation of Breast Cancer Radiation Therapy Techniques in Outfield Organs of Rando Phantom with Thermoluminescence Dosimeter

2019 ◽  
Author(s):  
M Behmadi ◽  
H Gholamhosseinian ◽  
M Mohammadi ◽  
Sh Naseri ◽  
M Momennezad ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Radiation Treatment ◽  
High Energy ◽  
Planning System ◽  
Treatment Planning System ◽  
Secondary Cancer ◽  
High Energy Photon ◽  
Energy Photon ◽  
Cancer Radiotherapy ◽  
Breast Cancer Radiotherapy

Background: Given the importance of scattered and low doses in secondary cancer caused by radiation treatment, the point dose of critical organs, which were not subjected to radiation treatment in breast cancer radiotherapy, was measured.Objective: The purpose of this study is to evaluate the peripheral dose in two techniques of breast cancer radiotherapy with two energies. Methods: Eight different plans in two techniques (conventional and conformal) and two photon energies (6 and 15 MeV) were applied to Rando Alderson Phantom’s DICOM images. Nine organs were contoured in the treatment planning system and specified on the phantom. To measure the photon dose, forty-eight thermoluminescence dosimeters (MTS700) were positioned in special places on the above nine organs and plans were applied to Rando phantom with Elekta presice linac. To obtain approximately the same dose distribution in the clinical organ volume, a wedge was used on planes with an energy of 6 MeV photon.         Results: Point doses in critical organs with 8 different plans demonstrated that scattering in low-energy photon is greater than high-energy photon. In contrast, neutron contamination in high-energy photon is not negligible. Using the wedge and shield impose greater scattering and neutron contamination on patients with low-and high-energy photon, respectively.    Conclusion: Deciding on techniques and energies required for preparing an acceptable treatment plan in terms of scattering and neutron contamination is a key issue that may affect the probability of secondary cancer in a patient.

NCS Report 2: Code of practice for the dosimetry of high-energy photon beams

1986 ◽  
Author(s):  
B.J. Mijnheer ◽  
A.H.L. Aalbers ◽  
J.J.M. Van Gasteren ◽  
A.G. Visser ◽  
F.W. Wittkämper
Keyword(s):  
High Energy ◽  
High Energy Photon ◽  
Photon Beams ◽  
Energy Photon ◽  
Code Of Practice

450 Radiation Response of a New Linear 5- MOSFET Array in High Energy Photon Beams

2005 ◽  
Vol 76 ◽  
pp. S195
Author(s):  
J. Cygler ◽  
A. Saoudi ◽  
C. Lambert ◽  
A. Hallil ◽  
M. Brown ◽  
...  
Keyword(s):  
High Energy ◽  
Radiation Response ◽  
High Energy Photon ◽  
Photon Beams ◽  
Energy Photon

Depth for dose calibration in high energy photon beams

1997 ◽  
Vol 43 (3) ◽  
pp. 311-313 ◽  
Author(s):  
Rickard Sjögren ◽  
Magnus G. Karlsson ◽  
Mikael Karlsson ◽  
Hans Svensson
Keyword(s):  
High Energy ◽  
High Energy Photon ◽  
Photon Beams ◽  
Energy Photon

scholarly journals Addendum to the AAPMˈs TG-51 protocol for clinical reference dosimetry of high-energy photon beams

2014 ◽  
Vol 41 (4) ◽  
pp. 041501 ◽  
Author(s):  
Malcolm McEwen ◽  
Larry DeWerd ◽  
Geoffrey Ibbott ◽  
David Followill ◽  
David W. O. Rogers ◽  
...  
Keyword(s):  
High Energy ◽  
High Energy Photon ◽  
Photon Beams ◽  
Energy Photon

Testing the GLAaS algorithm for dose measurements on low- and high-energy photon beams using an amorphous silicon portal imager

2008 ◽  
Vol 35 (2) ◽  
pp. 464-472 ◽  
Author(s):  
Giorgia Nicolini ◽  
Antonella Fogliata ◽  
Eugenio Vanetti ◽  
Alessandro Clivio ◽  
Daniel Vetterli ◽  
...  
Keyword(s):  
Amorphous Silicon ◽  
High Energy ◽  
High Energy Photon ◽  
Photon Beams ◽  
Energy Photon ◽  
Dose Measurements
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