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KMID : 1164220140260020297
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Journal of Korean Society for Radiotherapeutic Technology
2014 Volume.26 No. 2 p.297 ~ p.303
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Reproducibility Evaluation of Deep inspiration breath-hold(DIBH) technique by respiration data and heart position analysis during radiation therapy for Left Breast cancer patients
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Jo Jae-Young
Bae Sun-Myeong
Yoon In-Ha
Lee Ho-Yeon
Kang Tae-Young
Back Geum-Mun
Bae Jae-Beom
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Abstract
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Purpose : The purpose of this study is reproducibility evaluation of deep inspiration breath-hold(DIBH) technique by respiration data and heart position analysis in radiation therapy for Left Breast cancer patients.
Materials and Methods : Free breathing(FB) Computed Tomography(CT) images and DIBH CT images of three left breast
cancer patients were used to evaluate the heart volume and dose during treatment planing system( Eclipse version 10.0, Varian , USA ). The signal of RPM (Real-time Position Management) Respiratory Gating System (version 1.7.5, Varian, USA) was used to evaluate respiration stability of DIBH during breast radiation therapy. The images for measurement of heart position were acquired by the Electronic portal imaging device(EPID) cine acquisition mode. The distance of heart at the three measuring points(A, B, C) on each image was measured by Offline Review (ARIA 10, Varian, USA).
Results : Significant differences were found between the FB and DIBH plans for mean heart dose (6.82 vs. 1.91 Gy), heart V30 (68.57 vs. 8.26 ㎤), V20 (76.43 vs. 11.34 ㎤). The standard deviation of DIBH signal of each patient was ±0.07 cm, ±0.04 cm, ±0.13 cm, respectively. The Maximum and Minimum heart distance on EPID images were measured as 0.32 cm and 0.00 cm.
Conclusion : Consequently, using the DIBH technique with radiation therapy for left breast cancer patients is very useful to
establish the treatment plan and to reduce the heart dose. In addition, it is beneficial to using the Cine acquisition mode of EPID for the reproducibility evaluation of DIBH.
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KEYWORD
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Breast cancer, Deep inspiration breath-hold(DIBH), Respiration, Heart
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