Program Information
Measure the Average Glandular Dose of a 2D+3D Breast Imaging Protocol Using GE SenoClaire Breast Tomosynthesis System
Y Liang*, A Dutta , Columbia University Medical Center, New York, NY
Presentations
SU-D-209-7 (Sunday, July 31, 2016) 2:05 PM - 3:00 PM Room: 209
Purpose: To measure the average glandular dose (AGD) of a 2D+3D breast imaging protocol using GE SenoClaire breast tomosynthesis system
Methods: This study used a GE SenoClaire breast tomosynthesis unit, a Gammex ACR mammography accreditation phantom, 5 cm thick PMMA phantom, an Unfors RaySafe X2 mammography detector. The breast imaging protocol includes a regular 2D CC view and a 3D MLO view at 45 degree, using AUTO mode. Both ACR phantom and PMMA phantom were scanned under AUTO mode with 10 daN compression to obtain the techniques of 2D CC view, 3D MLO view, and 3D CC view. The techniques of ACR phantom were used for the following manual scan with only RaySafe X2 detector being positioned under the same compression paddle at the same height as the ACR phantom. The detector is at 3 cm from the chest wall edge and laterally centered in the X-ray field. Measurements were repeated with detector at 6 cm and 9 cm from the chest wall edge. The above procedure were repeated using the manual techniques of PMMA phantom. The measured entrance skin air Kerma was then converted to the AGD using two methods: one was listed in GE QC manual; the other was based on AAPM Report 223.
Results: The AGD from 2D+3D imaging for both breasts using AUTO mode is approximately 4.25 mGy for ACR phantom and approximately 6 mGy for 5 cm thick PMMA phantom. The difference between 3D MLO view and 3D CC view is less than 2%. The difference between two methods is also less than 3%.
Conclusion: The AGD of a 2D +3D breast imaging using GE SenoClaire is comparable to two regular 2D images if both are scanned using AUTO mode.
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