Exploring the factors related to the positioning error of three-dimensional conformal intensity modulated radiotherapy for chest tumors
We study the factors related to positioning errors in chest tumor patients undergoing three-dimensional conformal intensity modulated radiotherapy(IMRT)so as to accurately calculate the clinical target area(CTV)external radiation boundary(set-up margin(SM)value)and achieve safe radiotherapy.83 patients with chest malignant tumors treated with IMRT in our hospital were selected as the research subjects.The posi-tioning errors of IMRT in chest malignant tumors were measured and compared using posture fixation technol-ogy and electronic field imaging device(EPID).Multiple linear regression analysis was used to analyze the fac-tors related to the positioning errors,and SM was classified and calculated.The SM values of 83 subjects on the X,Y,and Z axes were 0.31,0.28,and 0.28 cm.Target localization,gender,and lung capacity are independent influencing factors for Y-axis individual random error,Z-axis individual systematic error,and Z-axis indi-vidual random error,respectively.The results show that the target localization,gender,and lung capacity of tu-mor patients undergoing IMRT treatment affect their positioning errors in different directions.
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