Objective To estimate the distribution of average glandular dose (AGD) in X-ray mammography in JiangsuProvince by the measurement of AGD and compressed breast thickness (CBT).
Methods A survey on 340 mammographyexposures recorded in 17 mammography machines from 17 medical facilities in 5 cities of Jiangsu Province was conducted,and theexposure parameters were retrieved.Entrance skin air kerma (ESAK) was measured according to the exposure records,and AGDwas calculated using the Dance's formula.AGD-CBT relationship was then analyzed.
Results The mean value of AGD in thecollected 340 mammography parameters was 1.656 mGy,and the mean value and the standard deviation of CBT were 4.22 cmand 1.12 cm,respectively.No significant difference in the AGD data was found between the craniocandal and mediolateral obliquegroups (t=-0.791,P > 0.05),but significant difference existed in the CBT data (t=-3.481,P<0.05).
Conclusion Variedmechanisms may be involved in the changes of AGD level caused by CBT.A further study can provide evidence for establishing aguideline of AGD in mammography receiver in China.
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