arXiv:2502.15424eess.IVcs.AI2025-02

用解剖信息和影像组学自动分割全身核磁中的神经纤维瘤,提升准确率。

Anatomy-Informed Deep Learning and Radiomics for Automated Neurofibroma Segmentation in Whole-Body MRI

  • 引入解剖结构和高危区作为上下文,指导肿瘤分割
  • 在高负荷病例中,肿瘤检测F1分数提升一倍
  • 适合临床使用,代码开源,支持多协议数据

神经纤维瘤病1型是一种遗传病,表现为神经纤维瘤(NFs)在大小、形态和解剖位置上高度异质。在全身磁共振成像(WB-MRI)中实现精准自动化分割对评估肿瘤负荷和监测疾病进展至关重要。本研究提出并分析了一个全自动的NF分割流程,包含三个阶段:解剖结构分割、NF分割和肿瘤候选分类。第一阶段使用MRSegmentator模型生成解剖分割图,并扩展高风险区域作为先验信息;该掩码与输入图像拼接,作为后续分割的解剖上下文。第二阶段采用3D各向异性解剖引导的U-Net集成模型,生成NF分割置信度图。第三阶段从置信度图提取肿瘤候选区域,基于影像组学特征进行分类,区分肿瘤与非肿瘤区域,降低假阳性。我们在三个测试集上评估:同分布数据(测试集1)、不同成像协议和场强(测试集2),以及低肿瘤负荷情况(测试集3)。实验结果表明,整合解剖信息后,每扫描的骰子相似系数(DSC)提升68%,每肿瘤的DSC提高21%,高负荷病例中肿瘤检测的F1分数翻倍。该方法已集成至3D Slicer平台,代码公开可获取。

原文摘要 · Abstract (English)

Neurofibromatosis Type 1 is a genetic disorder characterized by the development of neurofibromas (NFs), which exhibit significant variability in size, morphology, and anatomical location. Accurate and automated segmentation of these tumors in whole-body magnetic resonance imaging (WB-MRI) is crucial to assess tumor burden and monitor disease progression. In this study, we present and analyze a fully automated pipeline for NF segmentation in fat-suppressed T2-weighted WB-MRI, consisting of three stages: anatomy segmentation, NF segmentation, and tumor candidate classification. In the first stage, we use the MRSegmentator model to generate an anatomy segmentation mask, extended with a high-risk zone for NFs. This mask is concatenated with the input image as anatomical context information for NF segmentation. The second stage employs an ensemble of 3D anisotropic anatomy-informed U-Nets to produce an NF segmentation confidence mask. In the final stage, tumor candidates are extracted from the confidence mask and classified based on radiomic features, distinguishing tumors from non-tumor regions and reducing false positives. We evaluate the proposed pipeline on three test sets representing different conditions: in-domain data (test set 1), varying imaging protocols and field strength (test set 2), and low tumor burden cases (test set 3). Experimental results show a 68% improvement in per-scan Dice Similarity Coefficient (DSC), a 21% increase in per-tumor DSC, and a two-fold improvement in F1 score for tumor detection in high tumor burden cases by integrating anatomy information. The method is integrated into the 3D Slicer platform for practical clinical use, with the code publicly accessible.

医学图像分割影像组学深度学习神经纤维瘤

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