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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  

Jo, Jae Young (Department of Radiation Oncology, ASAN Medical Center)
Bae, Sun Myung (Department of Radiation Oncology, ASAN Medical Center)
Yoon, In Ha (Department of Radiation Oncology, ASAN Medical Center)
Lee, Ho Yeon (Department of Radiation Oncology, ASAN Medical Center)
Kang, Tae Young (Department of Radiation Oncology, ASAN Medical Center)
Baek, Geum Mun (Department of Radiation Oncology, ASAN Medical Center)
Bae, Jae Beom (Department of Radiation Oncology, ASAN Medical Center)
Publication Information
The Journal of Korean Society for Radiation Therapy / v.26, no.2, 2014 , pp. 297-303 More about this Journal
Abstract
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 $V_{30}$ (68.57 vs. $8.26cm^3$), $V_{20}$ (76.43 vs. $11.34cm^3$). The standard deviation of DIBH signal of each patient was ${\pm}0.07cm$, ${\pm}0.04cm$, ${\pm}0.13cm$, 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.
Keywords
Breast cancer; Deep inspiration breath-hold(DIBH); Respiration; Heart;
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