Dosimetric comparison of different radiotherapy techniques to determine the absorbed fetal dose in pregnant patients with left-sided breast cancer

In our study, we aimed to measure the dose exposed by fetus during three-dimensional conformal radiotherapy (3D-CRT) and intensity-modulated (IMRT) treatment techniques in pregnant patients who had undergo due breast cancer with thermoluminescence dosimetry (TLD) compare these measurements planning system (TPS). 2.5 mm- thick computed tomography (CT) images of Alderson Rando phantom device were taken for measurements. order TPS TLD readings PTV, 60 TLDs placed target volume phantom. Twenty-four 30th 31st sections phantom, which is likely be volumetric size first trimester pregnancy also located 25.84 cm from lower limit PTV. Six MV used seven different repeated 5 times each technique averaged. Fetal doses all found as 0.00 cGy. However, measured between 3.36 ± 0.19 cGy 16.10 2.04. 3D-CRT received lowest dose. addition, plans made using IMRT method, it seen that MSS-IMRT provides better fetal protection compared SW-IMRT technique. The should priority a patient has left RT, but if desired dose-volume histogram (DVH) cannot obtained 3D-CRT, may preferred.