Towards Out-of-Distribution Detection for breast cancer classification in Point-of-Care Ultrasound Imaging
This addresses the need for trustworthy algorithms in medical applications, though it is incremental as it builds on prior work.
This study tackled the problem of detecting out-of-distribution samples in breast cancer classification using point-of-care ultrasound imaging, finding that the ensemble method was the most robust, performing best across three OOD datasets.
Deep learning has shown to have great potential in medical applications. In critical domains as such, it is of high interest to have trustworthy algorithms which are able to tell when reliable assessments cannot be guaranteed. Detecting out-of-distribution (OOD) samples is a crucial step towards building a safe classifier. Following a previous study, showing that it is possible to classify breast cancer in point-of-care ultrasound images, this study investigates OOD detection using three different methods: softmax, energy score and deep ensembles. All methods are tested on three different OOD data sets. The results show that the energy score method outperforms the softmax method, performing well on two of the data sets. The ensemble method is the most robust, performing the best at detecting OOD samples for all three OOD data sets.