Measurement of the Esophageal Motion in External Beam Irradiation

Abstract

This study aimed to measure the shift of esophagus motion in external beam irradiation which lead to increase accuracy of determination of both PTV and ITV resulting in increase and enhancing therapeutic ratio and minimizing toxicity of both neighboring structure and rest volume of esophagus . This study was collected when treated patient is simulated using CT simulator of esophagus and chest organ treatment of cancer where the respiratory gated, three dimensional CT imaging of the full expiratory motion and minimum and maximum displacement was measured based in CT data. The data analyzed with Mat lab program under windows with t-test to assess the Motion of Esophagus in Radiation Therapy, The final result show that there was a difference in average between the oesophagus position regarding to (X-reading) of the inspiration phase which is equal to 10.16 + 3.31 and 10.6 +3.02. This difference was not significant at p= .05 using t-test with t= -9.74 and p=0.001. As well as here is a difference in average between the oesophagus position regarding to (Y-reading) of the inspiration phase which is equal to 8.6 + 2.02 and 12.7 +1.12. This difference was significant using t-test with t= .162 and p=0.87