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http://dx.doi.org/10.14316/pmp.2019.30.3.65

Dosimetric Effects of Intrafractional Organ Motion in Field-in-Field Technique for Whole-Breast Irradiation  

Hong, Chae-Seon (Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Ju, Sang Gyu (Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Choi, Doo Ho (Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Han, Youngyih (Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Huh, Seung Jae (Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Park, Won (Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Ahn, Yong Chan (Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Kim, Jin Sung (Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Lim, Do Hoon (Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine)
Publication Information
Progress in Medical Physics / v.30, no.3, 2019 , pp. 65-73 More about this Journal
Abstract
Purpose: We evaluated the motion-induced dosimetric effects on the field-in-field (FIF) technique for whole-breast irradiation (WBI) using actual patient organ motion data obtained from cine electronic portal imaging device (cine EPID) images during treatment. Materials and Methods: Ten breast cancer patients who received WBI after breast-conserving surgery were selected. The static FIF (SFIF) plan involved the application of two parallel opposing tangential and boost FIFs. To obtain the amplitude of the internal organ motion during treatment, cine EPID images were acquired five times for each patient. The outside contour of the breast (OCB) and chest wall (CW) contour were tracked using in-house motion analysis software. Intrafractional organ motion was analyzed. The dynamic FIF (DFIF) reflecting intrafractional organ motion incorporated into the SFIF plan was calculated and compared with the SFIF in terms of the dose homogeneity index (DHI90/10) for the target and V20 for the ipsilateral lung. Results: The average motion amplitudes along the X and Y directions were 1.84±1.09 mm and 0.69±0.50 mm for OCB and 1.88±1.07 mm and 1.66±1.49 mm for CW, respectively. The maximum motion amplitudes along the X and Y directions were 5.53 and 2.08 mm for OCB and 5.22 and 6.79 mm for CW, respectively. Significant differences in DHI90/10 values were observed between SFIF and DFIF (0.94 vs 0.95, P<0.05) in statistical analysis. The average V20 for the lung in the DFIF was slightly higher than that of the SFIF in statistical analysis (19.21 vs 19.00, P<0.05). Conclusion: Our findings indicate that the FIF technique can form a safe and effective treatment method for WBI. Regular monitoring using cine EPID images can be effective in reducing motion-induced dosimetric errors.
Keywords
Dose variation; Field-in-field technique; Organ motion; Whole-breast irradiation;
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