IJSR International Journal of Scientific Research 2277 - 8179 Indian Society for Health and Advanced Research ijsr-7-4-14957 Original Research Paper DOSIMETRIC COMPARISON OF DEEP INSPIRATION BREATH HOLD WITH ACTIVE BREATHING COORDINATOR VERSUS FREE BREATHING IN CARCINOMA LEFT BREAST PATIENTS RECEIVING ADJUVANT RADIOTHERAPY Madala Ravikrishna Dr. Dr. B.V. Subramanian Dr. A. Sreenivasa Raghava Dr. April 2018 7 4 01 02 ABSTRACT

 Total of 31 carcinoma left breast patients were included in the study. All underwent CT simulation in both Deep inspiration breath hold (DIBH) with

Active Breathing Coordinator (ABC) and Free breathing (FB) technique. Contouring and 3D–CRT planning was done on both the scans. Dose to
PTV was 50Gy in 25 fractions @ 2Gy per fraction, 5 fractions per week. Dosimetric parameters of organs at risk and PTV coverages were
compared. Volume of heart receiving 30Gy (V30) and Dmean , volume of lt lung receiving 20Gy, 10Gy (V20, V10) and Dmean , combined lung
volume receiving 20Gy, 10Gy, 5Gy (V20, V10, V5) has shown statistically significant dose reduction in DIBH with ABC technique compared to
FB technique without compromising PTV coverage.This study concluded that heart and lung doses can significantly be reduced without
compromising PTV coverage in left–sided breast cancer patients using DIBH with ABC technique.