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Estimated Average Glandular Dose for 1,828 Mammography Procedures in China: A Multicenter Study
Xiang DU1, Jin Wang1, Bao Li Zhu2
1Jiangsu Provincial Center for Disease Prevention and Control, Nanjing 210009, Jiangsu, China.
Biomedical and Environmental Sciences : BES
|June 21, 2019
Summary
This study investigated average glandular dose (AGD) in mammography across China. The mean AGD was 1.3 mGy, showing a skewed distribution and increasing with compressed breast thickness (CBT).
Area of Science:
- Radiological Physics
- Medical Imaging
- Radiation Dosimetry
Background:
- Mammography is a key breast cancer screening tool.
- Understanding average glandular dose (AGD) is crucial for patient safety and optimizing imaging protocols.
- Variations in AGD can occur due to equipment and patient factors.
Purpose of the Study:
- To determine the distribution of average glandular dose (AGD) in mammography practices in China.
- To analyze the relationship between AGD and compressed breast thickness (CBT).
- To provide data for establishing diagnostic reference levels (DRLs) in China.
Main Methods:
- A survey of 8 mammography machines across three cities in China.
- Recording 1,828 mammography exposure parameters.
- Calculating AGD using conversion coefficients based on a 3D Monte Carlo breast model after measuring incident air kerma.
Main Results:
- Compressed breast thickness (CBT) followed a normal distribution, while AGD exhibited a skewed distribution.
- The mean AGD was 1.3 mGy and the mean CBT was 4.6 cm.
- AGD demonstrated an upward trend with increasing CBT, with significant differences observed between MLO and CC views.
Conclusions:
- The mean AGD and CBT in Chinese mammography practices were found to be 1.3 mGy and 4.6 cm, respectively.
- Manufacturer-specific variations influence AGD, impacting machine response to CBT and target/filter combinations.
- This study offers valuable evidence for the establishment of diagnostic reference levels for mammography in China.
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