Breast mass classification in sonography with transfer learning using a deep convolutional neural network and color conversion
Open accessAbstract
Purpose: We propose a deep learning‐based approach to breast mass classification in sonography and compare it with the assessment of four experienced radiologists employing breast imaging reporting and data system 4th edition lexicon and assessment protocol. Methods: Several transfer learning techniques are employed to develop classifiers based on a set of 882 ultrasound images of breast masses. Additionally, we introduce the concept of a matching layer. The aim of this layer is to rescale pixel intensities of the grayscale ultrasound images and convert those images to red, green, blue (RGB) to more efficiently utilize the discriminative power of the convolutional neural network pretrained on the ImageNet dataset. We present how this conversion can be determined during fine‐tuning using back‐propagation. Next, we compare the performance of the transfer learning techniques with and without the color conversion. To show the usefulness of our approach, we additionally evaluate it using two publicly available datasets. Results: Color conversion increased the areas under the receiver operating curve for each transfer learning method. For the better‐performing approach utilizing the fine‐tuning and the matching layer, the area under the curve was equal to 0.936 on a test set of 150 cases. The areas under the curves for the radiologists reading the same set of cases ranged from 0.806 to 0.882. In the case of the two separate datasets, utilizing the proposed approach we achieved areas under the curve of around 0.890. Conclusions: The concept of the matching layer is generalizable and can be used to improve the overall performance of the transfer learning techniques using deep convolutional neural networks. When fully developed as a clinical tool, the methods proposed in this paper have the potential to help radiologists with breast mass classification in ultrasound.
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- Authors
- Byra, M., Galperin, M., Ojeda‐Fournier, H., Olson, L., O'Boyle, M., Comstock, C., & Andre, M.
- Affiliations
- Department of Radiology University of California, San Diego 9500 Gilman Drive La Jolla CA 92093 USA
- Almen Laboratories (United States) (US)
- University of California San Diego (US)
- Memorial Sloan Kettering Cancer Center (US)
- Venue
- Medical Physics
- Publisher
- Wiley
- Published
- 2019-01-16
- Volume
- 46
- Issue
- 2
- Pages
- 746-755
- ISSN
- 0094-2405 (ISSN-L)
- 2473-4209
- PMC
- PMC8544811
- OpenAlex
- W2906785117
- Cited by
- 253
- References
- 42
- Citations by year
- 2026: 10 · 2025: 25 · 2024: 35 · 2023: 46 · 2022: 51 · 2021: 40 · 2020: 33 · 2019: 13
- FWCI
- 12.12
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Medical Physics (publishedVersion)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- National Institutes of Health
- National Cancer Institute
- Gustavus and Louise Pfeiffer Research Foundation
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › AI in cancer detection
- Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Radiomics and Machine Learning in Medical Imaging
- Health Sciences › Health Professions › Health Information Management › Artificial Intelligence in Healthcare
- Keywords
- breast mass classification, breast ultrasound, transfer learning, color conversion, matching layer, fine-tuning, BI-RADS lexicon, radiologist comparison, computer-aided diagnosis
- MeSH terms
- Deep Learning, Adolescent, Adult, Breast Neoplasms, Color, Female, Humans, Image Processing, Computer-Assisted, ROC Curve, Ultrasonography, Young Adult
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