Abstract：Objective: To investigate the effect of organ dose modulation(ODM) on reducing radiation dose of sensitive organs in chest CT. Methods: Using a prospective case-control study design, 80 cases of patients with chest CT scan in our hospital from January to August 2019 were selected. Patients were divided into group A(n=40) and group B(n=40) by random number table method. Group A was the experimental group and group B was the control group. Patients in group A were scanned by ODM technology. Patients in group B had routine CT scan, and other parameters were as same as those in group A. Four directions tube currents, volumetric CT dose index(CTDIvol), dose length product(DLP), and effective dose(ED) were recorded at breast tissue level(anterior, left, posterior, and right) in the two groups. The region of interest(ROI) was selected from the gland region and thoracic aorta region at the breast tissue center level, and objective noise(SD) and signal-to-noise ratio(SNR) were compared. Two senior radiologists were employed to evaluate the quality of breast regional plane images on a 5-point subjective scale under the pulmonary and mediastinal Windows. Results: Among the 4 directions of breast CT tissue level in the two groups, the anterior tube current in group A was significantly lower than that in group B(P<0.05). There was no significant difference in tube current in other directions(P>0.05). Comparison of SD and SNR levels in breast region images between the two groups was statistically significant(P<0.05). Comparison of SD and SNR levels in thoracic aorta region showed no statistical significance(P>0.05). By comparing the CTDIvol and dose DLP of the two groups of patients, the difference was statistically significant(P<0.05). ED of X-ray in group A was 7.9% lower than that in group B(P<0.05). There was no significant difference in the subjective scores of the images of the transverse pulmonary window and mediastinal window between the two groups(P>0.05). Conclusion: ODM technique can effectively reduce the radiation dose of breast tissue in chest CT scan, the image quality that meets the diagnostic requirements can be obtained.
尹 炜，钟朝辉，秦翔宇，李 妍，赵田瑞，王振常. 器官剂量调制技术在女性胸部CT平扫中的应用[J]. 中国临床医学影像杂志, 2020, 31(7): 520-524.
YIN Wei, ZHONG Zhao-hui, QIN Xiang-yu, LI Yan, ZHAO Tian-rui, WANG Zhen-chang. Application of organ modulation technique in female chest CT scan. JOURNAL OF CHINA MEDICAL IMAGING, 2020, 31(7): 520-524.
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