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Feasibility study on the verification of actual beam delivery in a treatment room using EPID transit dosimetry

Overview of attention for article published in Radiation Oncology, December 2014
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Title
Feasibility study on the verification of actual beam delivery in a treatment room using EPID transit dosimetry
Published in
Radiation Oncology, December 2014
DOI 10.1186/s13014-014-0273-8
Pubmed ID
Authors

Tae Seong Baek, Eun Ji Chung, Jaeman Son, Myonggeun Yoon

Abstract

PurposeThe aim of this study is to evaluate the ability of transit dosimetry using commercial treatment planning system (TPS) and an electronic portal imaging device (EPID) with simple calibration method to verify the beam delivery based on detection of large errors in treatment room.Methods and materialsTwenty four fields of intensity modulated radiotherapy (IMRT) plans were selected from four lung cancer patients and used in the irradiation of an anthropomorphic phantom. The proposed method was evaluated by comparing the calculated dose map from TPS and EPID measurement on the same plane using a gamma index method with a 3% dose and 3 mm distance-to-dose agreement tolerance limit.ResultsIn a simulation using a homogeneous plastic water phantom, performed to verify the effectiveness of the proposed method, the average passing rate of the transit dose based on gamma index was high enough, averaging 94.2% when there was no error during beam delivery. The passing rate of the transit dose for 24 IMRT fields was lower with the anthropomorphic phantom, averaging 86.8%¿±¿3.8%, a reduction partially due to the inaccuracy of TPS calculations for inhomogeneity. Compared with the TPS, the absolute value of the transit dose at the beam center differed by ¿0.38%¿±¿2.1%. The simulation study indicated that the passing rate of the gamma index was significantly reduced, to less than 40%, when a wrong field was erroneously irradiated to patient in the treatment room.ConclusionsThis feasibility study suggested that transit dosimetry based on the calculation with commercial TPS and EPID measurement with simple calibration can provide information about large errors for treatment beam delivery.

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Mendeley readers

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Geographical breakdown

Country Count As %
Sweden 1 5%
Ireland 1 5%
Unknown 18 90%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 7 35%
Researcher 3 15%
Student > Bachelor 2 10%
Lecturer 1 5%
Student > Master 1 5%
Other 1 5%
Unknown 5 25%
Readers by discipline Count As %
Physics and Astronomy 7 35%
Agricultural and Biological Sciences 2 10%
Psychology 1 5%
Nursing and Health Professions 1 5%
Medicine and Dentistry 1 5%
Other 1 5%
Unknown 7 35%
Attention Score in Context

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 04 December 2014.
All research outputs
#20,245,139
of 22,772,779 outputs
Outputs from Radiation Oncology
#1,675
of 2,050 outputs
Outputs of similar age
#302,151
of 360,768 outputs
Outputs of similar age from Radiation Oncology
#67
of 85 outputs
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