Organ dose modulation in chest CT scan in female: protection of breasts / 中华放射医学与防护杂志

ABSTRACT

Objective To study the effects of organ dose modulation (ODM) technique on dose reduction of the breasts and the related thoracic image quality in female chest CT.Methods One hundred and twelve female patients with chest CT were enrolled in this study and divided into two groups according to the ordercontrol group (n =56,using conventional scan) and experimental group (n =56,using ODM technique).The tube currents in different directions (A/L/P/R) were analyzed in the two groups.The effects of ODM on the radiation dosage and image quality were assessed.Results The tubc currents in anterior and posterior direction were both (128 ± 43)mA in the control group.However,the tube current in the anterior was lower than that in the posterior in experimental group (t =-18.701,P ＜0.01).The tube currents in all direction in the experimental group were all lower than those in the control group (t =11.71-20.22,P ＜0.01).The CTDIvol and E in the experimental group were lower than those in the control group(t=3.58,3.55,P ＜0.05).There were no significant differences for the objective and the subjective scores between two groups (P ＞ 0.05).Conclusions ODM technique could protect the female breasts by reducing the radiation dose without image quality degrading during chest CT scan.