First approach to estimate breast radiation dose in a DBT prone biopsy table

摘要

Stereotactic breast biopsy (SBB) is a common clinical procedure for suspicious breast lesion analysis. With the arrival of DBT-guided biopsy systems, the clinical performance of such procedures has improved enormously since breast lesions are better detected. However, little information is found in the literature regarding the patient's radiation dose during these clinical procedures. This work presents, for the first time, a first approach to estimate the mean glandular dose (MGD) within the biopsy window for 101 patients who underwent breast biopsy in a commercially available DBT-guided prone table. This study is supported by the calculation of normalised glandular dose (DgN) coefficients from Monte Carlo simulations. Preliminary results show that the total MGD of the biopsy procedure varies between 10.2 mGy and 19.2 mGy for patients with breast thickness between 2 cm and 8 cm. Furthermore, a great variability in the number of acquisitions (tomo scan or stereo projections) of the biopsy procedure was observed. For the investigated system, MGD for DBT-guided breast biopsies are, for 5-6 cm thick breasts, around 23% lower than MGD observed in stereo biopsy procedures. The proposed method represents a first approach towards a full dose estimation of DBT-guided breast biopsy procedures.