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arXiv 2605.03358cs.CV
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像临床医生一样追踪:解剖引导的空间先验用于头影测量标志点检测

Tracing Like a Clinician: Anatomy-Guided Spatial Priors for Cephalometric Landmark Detection

Founder & CTO, CephTrace(CephTrace创始人及CTO);Clinical Advisor, CephTrace(CephTrace临床顾问)

Sidhartha Mohapatra, Pallavi Mohanty

AI总结:

提出一种五阶段解剖引导管道,生成置信度加权的空间先验来训练HRNet-W32,在1502张X光片上实现25个标志点平均径向误差1.04 mm,并通过消融实验和临床验证证明其有效性。

摘要:

临床医生通过遵循结构化的解剖工作流程来追踪头影测量X光片——然而,先前没有系统明确地将此编码到计算中。我们提出了一个五阶段解剖引导管道,生成置信度加权的空间先验,用于塑造HRNet-W32的训练。该系统在来自7+个成像设备的1502张X光片上的25个标志点实现了1.04 mm的平均径向误差——通过显式解剖先验而非学习注意力,与HYATT-Net(在CEPHA29上1.05 mm)相当。三路消融实验隔离了机制:解剖先验保持1%的验证-测试差距,而去除先验则产生88%的差距(1.94 mm)——尽管验证收敛相同。训练×推理先验矩阵确认:(1)所有模型与推理无关,(2)仅28通道架构无益处,(3)随机先验部分且不稳定(1.72 mm),(4)只有解剖正确、图像特定的先验产生1.04 mm——作为训练时的正则化器。部署时无需生成先验。五折交叉验证(p=0.0015)、患者级置换检验(p<0.0001,n=151)、复现基线、Grad-CAM分析和临床验证(151名患者包括72例边界病例的100%骨骼分类,kappa=1.00)提供了汇聚证据。跨领域实验支持假设:先验有效性取决于标志点空间熵——在四个领域前瞻性确认。补充材料包含在内。

英文摘要:

Clinicians trace cephalometric radiographs following a structured anatomical workflow, yet no prior system encodes this into computation. We present a five-phase anatomy-guided pipeline producing confidence-weighted spatial priors that shape HRNet-W32 training, achieving 1.04 mm mean radial error on 25 landmarks across 1,502 radiographs from 7+ imaging devices. A training x inference prior matrix isolates the mechanism: anatomical priors maintain a 1% validation-to-test gap versus 88% without priors (1.94 mm), despite identical validation convergence. The matrix establishes that all trained models are inference-independent, the expanded architecture alone provides no benefit, random priors yield partial but unstable improvement (1.72 mm), and only image-specific anatomically correct priors produce the 1.04 mm result -- functioning as a training-time regularizer requiring no automated prior generation at deployment. Five-fold cross-validation (p=0.0015), patient-level permutation testing (p<0.0001, n=151), quantified Grad-CAM analysis (88% vs. 74% in-zone activation, p<0.001), and clinical measurement validation (skeletal classification kappa=0.79-0.84, zero Class II<->III reversals, ICC>0.95) provide converging evidence. Cross-domain experiments on echocardiography, cervical spine, and hand radiography support the hypothesis that prior effectiveness scales with the spatial entropy of the landmark distribution.

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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