Abstract

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Title:: Relationship between average glandular dose in digital breast tomosynthesis and image quality

Author(s):: CAI Donglu; CAI Siqing; YAN Lisheng; XU Qingjiang; HUANG Shujuan; Department of Radiology, the Second Affiliated Hospital, Fujian Medical University, Quanzhou 362000, China

Keywords:: Keywords: mammary gland; digital breast tomosynthesis; average glandular dose; image quality; correlation analysis

Abstract:: Abstract: Objective To explore and analyze the relationship between average glandular dose (AGD) in digital breast tomosynthesis and image quality. Methods The clinical data of 236 patients examined by digital breast tomosynthesis in the Second Affiliated Hospital, Fujian Medical University were collected. According to the thickness of mammary gland, the enrolled patients were divided into 4 groups, with 59 patients in each group. Non-parametric statistics and correlation analysis were used to analyze the correlation between the exposure (mAs) for the mammary gland of different thicknesses and AGD. For the mammary gland of the same thickness, the mammograms obtained under different AGD were used for analyzing the relationship between image signal-to-noise ratio and AGD. Results When the thickness of mammary gland increased, the exposure (mAs) and AGD increased, and there was a significant correlation (r=0.977, P<0.05). For the mammogram of the mammary gland of the same thickness, the higher the AGD was, the higher the image signal-to-noise ratio was, with obvious correlations (thickness≤29 mm: r=0.977, P=0.023; thickness of 30-45 mm: r=0.994, P=0.006; thickness of 46-59 mm: r=0.998, P=0.002; thickness≥60 mm: r=0.980, P=0.020). Conclusion The thicker the mammary gland is, the greater the exposure (mAs) and AGD are. For the mammary gland of the same thickness, with a higher AGD, the signal-to-noise ratio of image is higher and image quality is better.