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arXiv 2311.11772cs.CVcs.LG

用于全切片图像分类的病理特征提取器基准测试

Benchmarking Pathology Feature Extractors for Whole Slide Image Classification

University of St Andrews(圣安德鲁斯大学);Else Kröner Fresenius Center for Digital Health(埃尔瑟·克勒纳·弗雷森纽斯数字健康中心);TUD Dresden University of Technology(德累斯顿工业大学);University Hospital Aachen(亚琛大学医院);University Hospital Heidelberg(海德堡大学医院);University Hospital Dresden(德累斯顿大学医院)

Georg Wölflein, Dyke Ferber, Asier R. Meneghetti, Omar S. M. El Nahhas, Daniel Truhn, Zunamys I. Carrero, David J. Harrison, Ognjen Arandjelović, Jakob Nikolas Kather

AI总结:

本研究针对弱监督全切片图像分类任务,对14种病理特征提取器开展全面基准测试,发现跳过染色归一化不影响性能、特征提取器选择是性能关键、低倍切片可满足分类需求,为简化数字病理工作流程提供依据。

摘要:

弱监督全切片图像分类是计算病理学中的一项关键任务,该任务需要从构成切片的一组图像块中预测切片级标签。构建解决该任务的模型涉及多种设计选择,这些选择往往缺乏可靠的实证依据或确凿的理论支撑。为解决这一问题,我们对特征提取器开展了全面的基准测试,以回答三个核心问题:1)染色归一化是否仍是必要的预处理步骤?2)哪些特征提取器最适合下游切片级分类任务?3)放大倍数如何影响下游性能?本研究是迄今为止对公开可用病理特征提取器最全面的评估,涵盖14种特征提取器、9项任务、5个数据集、3种下游架构、2种放大倍数以及多种预处理设置,累计开展了超过10000次训练运行。我们的研究结果对现有假设提出了挑战:1)通过实证观察以及对潜在空间的分析,我们发现跳过染色归一化和图像增强不会降低性能,同时还能显著减少内存占用和计算需求。2)我们提出了一种新型评估指标用于比较下游相对性能,结果表明特征提取器的选择是影响下游性能的最关键因素。3)我们发现较低放大倍数的切片足以实现准确的切片级分类。与以往的图像块级基准测试研究不同,我们的方法聚焦于弱监督设置下的切片级生物标志物预测任务,并设置了外部验证队列,以此强调临床相关性。本研究结果可通过最小化预处理需求、为特征提取器的选择提供参考,助力简化数字病理工作流程。

英文摘要:

Weakly supervised whole slide image classification is a key task in computational pathology, which involves predicting a slide-level label from a set of image patches constituting the slide. Constructing models to solve this task involves multiple design choices, often made without robust empirical or conclusive theoretical justification. To address this, we conduct a comprehensive benchmarking of feature extractors to answer three critical questions: 1) Is stain normalisation still a necessary preprocessing step? 2) Which feature extractors are best for downstream slide-level classification? 3) How does magnification affect downstream performance? Our study constitutes the most comprehensive evaluation of publicly available pathology feature extractors to date, involving more than 10,000 training runs across 14 feature extractors, 9 tasks, 5 datasets, 3 downstream architectures, 2 levels of magnification, and various preprocessing setups. Our findings challenge existing assumptions: 1) We observe empirically, and by analysing the latent space, that skipping stain normalisation and image augmentations does not degrade performance, while significantly reducing memory and computational demands. 2) We develop a novel evaluation metric to compare relative downstream performance, and show that the choice of feature extractor is the most consequential factor for downstream performance. 3) We find that lower-magnification slides are sufficient for accurate slide-level classification. Contrary to previous patch-level benchmarking studies, our approach emphasises clinical relevance by focusing on slide-level biomarker prediction tasks in a weakly supervised setting with external validation cohorts. Our findings stand to streamline digital pathology workflows by minimising preprocessing needs and informing the selection of feature extractors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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