DOSIMETRIC COMPARISON OF DEEP INSPIRATION BREATH HOLD WITH ACTIVE BREATHING COORDINATOR VERSUS FREE BREATHING IN CARCINOMA LEFT BREAST PATIENTS RECEIVING ADJUVANT RADIOTHERAPY

Volume : VII, Issue : IV, April - 2018

Dr. Madala Ravikrishna, Dr. Swapna Jilla, Dr. B. V. Subramanian, Dr. Pranabandhu Das, A. Sreenivasa Raghava

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

Active Breathing Coordinator (ABC) and Free eathing (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 east cancer patients using DIBH with ABC technique.