Analyzing Tumors by Synthesis

Qi Chen (), Yuxiang Lai (), Xiaoxi Chen (), Qixin Hu (), Alan Yuille () and Zongwei Zhou ()
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Qi Chen: University of Chinese Academy of Sciences
Yuxiang Lai: Emory University
Xiaoxi Chen: University of Illinois Urbana-Champaign
Qixin Hu: University of Southern California
Alan Yuille: Johns Hopkins University
Zongwei Zhou: Johns Hopkins University

Chapter Chapter 5 in Generative Machine Learning Models in Medical Image Computing, 2025, pp 85-110 from Springer

Abstract: Abstract Computer-aided tumor detection has shown great potential in enhancing the interpretation of over 80 million CT scans performed annually in the United States. However, challenges arise due to the rarity of CT scans with tumors, especially early-stage tumors. Developing AI with real tumor data faces issues of scarcity, annotation difficulty, and low prevalence. Tumor synthesis addresses these challenges by generating numerous tumor examples in medical images, aiding AI training for tumor detection and segmentation. Successful synthesis requires realistic and generalizable synthetic tumors across various organs. This chapter reviews AI development on real and synthetic data and summarizes two key trends in synthetic data for cancer imaging research: modeling-based and learning-based approaches. Modeling-based methods, like Pixel2Cancer, simulate tumor development over time using generic rules, while learning-based methods, like DiffTumor, learn from a few annotated examples in one organ to generate synthetic tumors in others. Reader studies with expert radiologists show that synthetic tumors can be convincingly realistic. We also present case studies in the liver, pancreas, and kidneys reveal that AI trained on synthetic tumors can achieve performance comparable to, or better than, AI only trained on real data. Tumor synthesis holds significant promise for expanding datasets, enhancing AI reliability, improving tumor detection performance, and preserving patient privacy.

Date: 2025
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DOI: 10.1007/978-3-031-80965-1_5

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