利用DICOM信息估算数字乳腺成像辐射剂量

Using DICOM information to evaluate radiation dose of digital mammography

目的:研究数字乳腺成像DICOM图像头文件中剂量数据的可靠性。方法:采用不同扫描条件扫描乳腺体模;采用电离室剂量计测量体模入射剂量,计算平均腺体剂量并记录DICOM信息中的剂量数据。结果:对于Mo/Mo组合,DICOM图像头文件中入射剂量显示值和实测值的误差为17.30%,MGD显示值和实测值的误差为5.91%;对于Mo/Rh组合,入射剂量显示值和实测值的误差为11.57%,MGD显示值和实测值的误差为3.70%。结论:DICOM信息剂量数据与实测数据基本一致,利用DICOM信息可以估算数字乳腺成像辐射剂量水平。

Objective： To study the reliability of dose data in DICOM header for digital mammography. Methods： Entrance dose and mean glandular dose （MGD） were measured under different tube voltages and tube currents and dose data in DICOM header were recorded. Results： For Mo/Mo rhodium filter combination, average error of entrance dose was 17.30%, average error of MGD was 5.91%. For Mo/Rh rhodium filter combination, average error of entrance dose was 11.57%, average error of MGD was 3.70%. Conclusion： Dose data in DICOM header is in consistent with the measured data. It can be used to estimate the dose level for digital mammography.