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Optimization of the Radiation Dose of Digital Breast Tomosynthesis in Opportunistic Screening by Studying the Effect of Different Combinations of FFDM and DBT Views

Authors Sheng M, Ji J, Zhang C, Zhang Z, Gong S, Lu Y

Received 11 January 2021

Accepted for publication 26 February 2021

Published 30 March 2021 Volume 2021:14 Pages 1147—1154


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Scott Fraser

Meihong Sheng,1 Juan Ji,1 Chenying Zhang,1 Zirui Zhang,1 Shenchu Gong,1 Yihua Lu2

1Department of Radiology, Affiliated Hospital 2 of Nantong University, Nantong First People’s Hospital, Nantong, Jiangsu, 226001, People’s Republic of China; 2Department of Epidemiology and Medical Statistics, School of Public Health, Nantong University, Nantong, 226019, Jiangsu, People’s Republic of China

Correspondence: Shenchu Gong Email [email protected]

Background: Full-field digital mammography (FFDM) and digital breast tomosynthesis (DBT) are used separately or in combination to identify small breast lesions. The dose of the examination depends on the density of the breast and the imaging (FFDM or DBT) performed. We have performed a retrospective review of FFDM and DBT in women with denser breasts in order to demonstrate how varying the combination of FFDM and DBT in CC and MLO views affects lesion detection and the average gland dose.
Methods: Eighty-one patients with dense breast received both full-field digital mammography (FFDM) and DBT bilateral screening. The recorded data included the display rates for small lesions or other positive lesions, the type of breast gland, the average gland dose (AGD), and the compression thickness of different collection methods. ANOVA was used to compare the AGD among different collection combinations, and t-test was used to perform pairwise comparison between groups with the same gland type. The relationship between AGD and compression thickness was analyzed by Pearson linear correlation, and the lesion display rates were compared using Chi-square test.
Results: We found that AGDs were significantly different among the 6 collection methods (F = 119.06, p< 0.01), but were not obviously different between groups with the same gland type (F = 0.848, p> 0.05). The types of dense glands were correlated with compression thickness, and the thickness was moderately to strongly correlated with AGD (r=0.596– 0.736). The combination of single-view DBT(CC-DBT) and FFDM showed significantly higher mass display rates than the two-view FFDM (p< 0.05), while the display rates for other positive lesions were similar (p> 0.05).
Conclusion: Our study showed that in opportunistic screening of patients with small breast masses that can be easily detected by ultrasound, MLO-FFDM+CC-DBT or CC-FFDM+MLO-DBT combinations can better balance the individual average gland dose and detection accuracy. The study result cannot be applied to the detection of non-mass lesions as the numbers are too small.

Keywords: breast, breast tomography, screening, digital mammography, average gland dose

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