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Relationship between AGDDBT and breast density or compressed breast thickness
Pages: 494-497
Year: Issue:  5
Journal: Radiologic Practice

Abstract: Objective:To discuss the relationship between AGDDBT and breast density or compressed thickness.Methods:271 female patients who had bilateral mammography under the mode of DBT combo (taking images of the same breast and same compressed thickness with DBT and FFDM) in our hospital were included.542 images of unilateral breast cranio-caudal view with DBT and 542 images of unilateral breast cranio-caudal view with FFDM were analyzed (AGD,breast density and compressed thickness).Results:Compressed thickness and AGDDBT had a strong positive correlation (r =0.920,P < 0.001).Breast density and AGDDBT had a weak positive correlation (r =0.263,P < 0.001).Compressed thickness and breast density both independently influenced AGDDBT (Bcompressed thickness =0.046,Bb density =0.084,P <0.001).Compressed thickness had a greater influence on AGDDBT than did breast density (std Bcompressed thickness =0.94,std Bb density =0.143).Compressed thickness and △AGD (AGDDBT minus AG-DFFDM) had a weak negative correlation (r =-0.287,P < 0.001).Breast density and △AGD had a medium-strong negative correlation (r =-0.616,P < 0.001).Breast density and compressed thickness both independently influenced △AGD (Bcompressed thickness =0.012,Bbreast density =-0.219,P < 0.001).Breast density had a greater influence on △AGD than did compressed thickness (std Bcompressed thickness =-0.366,std Bbreastdensity =0.580).When breast density > 75% and compressed thickness was 56 ~ 75mm or 76 ~95mm,the mean value of AGDDBT was lower than that of AGDFFDM,thus the difference was statistical siginificant (P <0.05).When 25% ≤ breast density ≤ 50% and compressed thickness was 76 ~ 95mm,the mean value of AGDDBT was similar to that of AGDFFDM (P > 0.05).When 50 % < breast density ≤ 75% and compressed thickness was 56 ~ 75mm,the mean value of AGDDBT was similar to that of AGDFFDM (P > 0.05).In the other groups with different breast density and compressed thickness,the mean values of AGDDBT were all higher than those of AGDFFDM;thus the difference was statistical significant (P < 0.05).Conclusions:Breast density and compressed thickness are independent influence factors of AGDDBT.AGDDBT has a positive correlation with breast density or compressed thickness.Meanwhile,compressed thickness has a greater influence on AGDDBT than does breast density.Breast density and compressed thickness are independent influence factors of△ AGD.△AGD has a negative correlation with breast density or compressed thickness.Meanwhile,breast density has a greater influence on △AGD than does compressed thickness.According to this set of data,when breast density >75% and compressed thickness was 56 ~ 95mm,the mean value of AGDDBT was lower than that of AGDFFDM.In the other groups with different breast density and compressed thickness (mean compressed thickness ≤ 95mm),the mean values of AGDDBT were all higher than or equal to those of AGDFFDM.
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