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- W1981195246 abstract "In this article, the breath-hold and gating concepts were combined for application of lung cancer radiation treatment. The tumor movement was immobilized based on deep inspiration breath hold (DIBH), in which the breath-hold consistency and stability were monitored by infrared (IR) tracking and controlled by gating with a predefined threshold. The authors' goal is to derive the benefits from both techniques, namely, the minimized treatment margin and the known advantages of deep inspiration. The efficacy of the technique in terms of tumor immobility and treatment setup accuracy was evaluated in the study.Fourteen patients who were diagnosed with non small cell lung cancer were included in this study. The control of tumor immobility was investigated interfractionally and intrafractionally. The intrabreath-hold tumor motion was devised based on the external marker movement, in which the tumor-marker correlation was studied. The margin of the planning target volume (PTV) was evaluated based on two factors: (1) The treatment setup error accounts for the patient setup and interbreath-hold variations and (2) the intrabreath-hold tumor motion in which the residual tumor motion during irradiation was studied.As the result of the study, the group systematic error and group random error of treatment setup measured at the isocenter were 0.2(R) +/- 1.6, 1.0(A) +/- 2.0, and 0.3(S) +/- 1.5 mm in the left-right (LR), anterior-posterior (AP), and caudal-cranial (CC) directions, respectively. The Pearson correlation coefficient were 0.81 (LR), 0.76 (AP), and 0.85 (CC) mm and suggest tendency in linear correlation of tumor and marker movement. The intrabreath-hold tumor was small in all directions. The group PTV margins of 3.8 (LR), 4.6 (AP), and 4.8 (CC) mm were evaluated to account for both setup errors and residual tumor motion during irradiation.The study applies the DIBH technique in conjunction with IR positional tracking for tumor immobilization and treatment setup localization. The technique not only proved to be reliable in terms of good tumor immobility and accurate treatment positioning but also to be potentially useful for dose escalation treatment as regarding of the substantially reduced PTV margin and minimizing radiation toxicity from the fully expanded lung volume." @default.
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- W1981195246 date "2010-08-16" @default.
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- W1981195246 title "Real‐time monitoring and control on deep inspiration breath‐hold for lung cancer radiotherapy—Combination of ABC and external marker tracking" @default.
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- W1981195246 doi "https://doi.org/10.1118/1.3476463" @default.
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