Reliability of the Percent Density in Digital Mammography with a Semi-Automated Thresholding Method
Journal of Breast Cancer 2014³â 17±Ç 2È£ p.174 ~ p.179
¼Õ±Í¿¬(Sohn Gui-Yun) - University of Ulsan College of Medicine Asan Medical Center Department of Surgery
ÀÌÁ¾¿ø(Lee Jong-Won) - University of Ulsan College of Medicine Asan Medical Center Department of Surgery
¹Ú¼º¿ø(Park Sung-Won) - University of Ulsan College of Medicine Asan Medical Center Department of Radiology
¹ÚÁöÈÆ(Park Ji-Hoon) - University of Ulsan College of Medicine Asan Medical Center Department of Surgery
¿ìÁö¿µ(Woo Ji-Young) - University of Ulsan College of Medicine Asan Medical Center Department of Surgery
±èÈÁ¤(Kim Hwa-Jung) - University of Ulsan College of Medicine Asan Medical Center Department of Biostatistics and Clinical Epidemiology
½ÅÈñÁ¤(Shin Hee-Jung) - University of Ulsan College of Medicine Asan Medical Center Department of Radiology and Research Institute of Radiology
±èÇÐÈñ(Kim Hak-Hee) - University of Ulsan College of Medicine Asan Medical Center Department of Radiology and Research Institute of Radiology
Á¤°æÇØ(Jung Kyung-Hae) - University of Ulsan College of Medicine Asan Medical Center Department of Oncology
¼ºÁÖÇå(Sung Joo-Hon) - Seoul National University School of Public Health and Institution of Health and Environment Department of Epidemiology
À̽¿í(Lee Seung-Wook) - Seoul National University Graduate School of Public Health
¼Õº´È£(Son Byung-Ho) - University of Ulsan College of Medicine Asan Medical Center Department of Surgery
¾È¼¼Çö(Ahn Sei-Hyun) - University of Ulsan College of Medicine Asan Medical Center Department of Surgery
Abstract
Purpose: The reliability of the quantitative measurement of breast density with a semi-automated thresholding method (Cumulus¢â) has mainly been investigated with film mammograms. This study aimed to evaluate the intrarater reproducibility of percent density (PD) by Cumulus¢â with digital mammograms.
Methods: This study included 1,496 craniocaudal digital mammograms from the unaffected breast of breast cancer patients. One rater reviewed each mammogram and estimated the PD using the Cumulus¢â method. All images were reassessed by the same rater 1 month later without reference to the previously assigned values. The repeatability of the PD was evaluated by an intraclass correlation coefficient (ICC). All patients were grouped based on their body mass index (BMI), age, family history of breast cancer, breastfeeding history and breast area (calculated with Cumulus¢â), and subgroup analysis for the ICC of each group was performed. All patients were categorized by their Breast Imaging Reporting and Data System (BI-RADS) density pattern, and the mean and standard deviation of the PD by each BI-RADS categories were compared.
Results: The ICC for the PD was 0.94, indicating excellent repeatability. The discrepancy between the paired PD values ranged from 0 to 23.93, with an average of 3.90 (standard deviation=3.39). The subgroup ICCs for the PD ranged from 0.88 to 0.96, indicating excellent reliability in all subgroups regardless of patient variables. The ICCs of the PD for the high-risk (BI-RADS 3 and 4) and low-risk (BI-RADS 1 and 2) groups were 0.90 and 0.88, respectively.
Conclusion: This study suggests that PD calculated with digital mammograms has an acceptable reliability regardless of patient age, BMI, family history of breast cancer, breastfeeding history, breast size, and BI-RADS density pattern.
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Breast, Mammography, Observer variation
KMID :
1134120140170020174
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