A Hernandez*, J Boone, J Seibert, Department of Radiology, University of California Davis

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  A Hernandez

MO-E115-IePD-F8-2 (Monday, 7/11/2022) 1:15 PM - 1:45 PM [Eastern Time (GMT-4)]

Exhibit Hall | Forum 8

Purpose: To utilize the data extracted from automatic dose monitoring software (DMS) to better understand trends in the patient population and dose for screening (Sc) and diagnostic (Dx) mammography examinations.

Methods: A DMS was used to extract mammography and breast tomosynthesis dose data from January 2017 to January 2022 which represents a total of 96,242 examinations (93,092 Sc and 3150 unilateral Dx) and 242,570 total acquisitions at our institution. This data was used to stratify patient characteristics and trends in mean glandular dose (MGD) across parameters including compressed breast thickness (T), tube voltage, view (CC and MLO), and examination type (Sc and Dx).

Results: The mean [5th %-tile, 95th %-tile] age of women undergoing mammography was 63 years [46,80] for Sc and 61 years [42,79] for Dx examinations. The mean T was 60 mm [34,86] and 57 mm [29,88] for Sc and Dx examinations, respectively. MGD levels were ~25% greater for Dx compared with Sc for a single acquisition with mean values of 2.45 mGy [0.89,4.53] and 1.97 mGy [1.02,3.30], respectively. At the examination level, the total MGD was 37% higher for unilateral Dx compared with a Sc examination of a single breast. This is attributed to the ~22% greater number of acquisitions for Dx compared with Sc. For Sc, an increase in MGD was observed with increasing T up to ~2 mGy at T = 80 mm for CC, and ~3 mGy at T = 100 mm for MLO. For Dx examinations, the MGD was consistent across T for CC but increased with increasing T for MLO.

Conclusion: DMS data provides important insights into dose trends across imaging techniques and patient characteristics. Given the high number of cases analyzed, this data could be useful for future work in dose management and optimization as well as for computer modeling studies.

Funding Support, Disclosures, and Conflict of Interest: Author AMH is a shareholder and contractor for Izotropic Corporation. Author JMB is a shareholder, cofounder and director for Izotropic Corporation

Keywords

Not Applicable / None Entered.

Taxonomy

IM- Breast X-Ray Imaging: Mammography

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