研究白细胞作为非洲血涂片图像中疟原虫检测假阳性来源
Investigating White Blood Cells as a Source of False-Positive Malaria Parasite Detection in African Blood-Smear Images
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中文总结 AI 辅助
本研究通过双模型对比和七项空间统计分析，证明白细胞并非疟疾检测假阳性的来源，假阳性源于染色伪影，并提出染色增强与环状体标注的缓解方案。
中文摘要 AI 辅助
存在于每张吉姆萨染色厚血涂片上的白细胞（WBC）与早期恶性疟原虫环状体滋养体具有相似的视觉特征：体积小、形态呈圆形、染色呈深紫色。在仅检测寄生虫的检测器中，白细胞是假阳性的一个看似合理但未经检验的来源。我们在Lacuna疟疾检测数据集（来自乌干达和加纳的8000张图像）上训练了两个YOLOv12s模型：模型A仅使用寄生虫标签，模型B同时使用寄生虫和白细胞标签。七项独立的空间和统计分析检验了假阳性（FP）预测是否聚集在白细胞位置附近。所有七项分析均否定了这一假设。在两个模型中，95%的假阳性是纯背景检测（与任何真实框的交并比低于0.10）；零个是白细胞类别混淆。Ripley's Cross-K分析显示，在测试的每个半径下，假阳性质心与白细胞位置之间存在空间排斥。模型B整体优于模型A（mAP50为0.859对0.755），且该优势在所有白细胞邻近区间内均匀分布，表明多任务表示学习而非白细胞抑制是原因。假阳性源于吉姆萨染色碎片和制备伪影。有效的缓解措施需要染色伪影增强和对未标注的早期环状体进行标注，而非仅靠白细胞标注。
英文摘要
White blood cells (WBCs) present on every Giemsa-stained thick blood smear share visual properties with early-stage Plasmodium falciparum ring-form trophozoites: small size, round morphology, and intense purple staining. They are a plausible but untested source of false positives in parasite-only detectors. We trained two YOLOv12s models on the Lacuna Malaria Detection dataset (8,000 images from Uganda and Ghana): Model A with parasite labels only, and Model B with both parasite and WBC labels. Seven independent spatial and statistical analyses tested whether false positive (FP) predictions cluster near WBC locations. All seven refute the hypothesis. In both models, 95% of FPs are pure background detections (IoU below 0.10 against any ground-truth box); zero are WBC class confusions. Ripley's Cross-K analysis shows spatial repulsion between FP centroids and WBC positions at every radius tested. Model B outperforms Model A overall (mAP50 0.859 vs. 0.755), and the advantage is uniform across all WBC-proximity bands, pointing to multi-task representation learning rather than WBC suppression as the cause. False positives arise from Giemsa stain debris and preparation artifacts. Effective mitigation requires staining artifact augmentation and annotation of unannotated early-stage ring forms rather than WBC labeling alone.
发表机构
- Carnegie Mellon University Africa（卡内基梅隆大学非洲校区）
- University of Rwanda（卢旺达大学）
- Federal University of Technology, Minna（米纳联邦理工大学）
- McGill University（麦吉尔大学）
机构由 AI 辅助整理，请以论文原文为准。
