Improving small lesion segmentation in CT scans using intensity distribution supervision: application to small bowel carcinoid tumor

Seung Yeon Shin; Thomas C. Shen; Stephen A. Wank; Ronald M. Summers

doi:10.1117/12.2651979

7 April 2023 Improving small lesion segmentation in CT scans using intensity distribution supervision: application to small bowel carcinoid tumor

Seung Yeon Shin, Thomas C. Shen, Stephen A. Wank, Ronald M. Summers

Author Affiliations +

Proceedings Volume 12465, Medical Imaging 2023: Computer-Aided Diagnosis; 124651S (2023) https://doi.org/10.1117/12.2651979
Event: SPIE Medical Imaging, 2023, San Diego, California, United States

Conference Poster

Abstract

Finding small lesions is very challenging due to lack of noticeable features, severe class imbalance, as well as the size itself. One approach to improve small lesion segmentation is to reduce the region of interest and inspect it at a higher sensitivity rather than performing it for the entire region. It is usually implemented as sequential or joint segmentation of organ and lesion, which requires additional supervision on organ segmentation. Instead, we propose to utilize an intensity distribution of a target lesion at no additional labeling cost to effectively separate regions where the lesions are possibly located from the background. It is incorporated into network training as an auxiliary task. We applied the proposed method to segmentation of small bowel carcinoid tumors in CT scans. We observed improvements for all metrics (33.5% → 38.2%, 41.3% → 47.8%, 30.0% → 35.9% for the global, per case, and per tumor Dice scores, respectively.) compared to the baseline method, which proves the validity of our idea. Our method can be one option for explicitly incorporating intensity distribution information of a target in network training.

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Seung Yeon Shin, Thomas C. Shen, Stephen A. Wank, and Ronald M. Summers "Improving small lesion segmentation in CT scans using intensity distribution supervision: application to small bowel carcinoid tumor", Proc. SPIE 12465, Medical Imaging 2023: Computer-Aided Diagnosis, 124651S (7 April 2023); https://doi.org/10.1117/12.2651979

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