AI可精准预测截肢者假肢接受腔的适配调整,提升设计标准化水平。
Evaluating Artificial Intelligence Algorithms for the Standardization of Transtibial Prosthetic Socket Shape Design
- 用3D扫描残肢数据,训练三种AI模型预测适配调整而非直接生成最终形状
- 随机森林模型表现最佳,中位误差仅1.24毫米,优于其他模型
- 适合假肢定制化设计、医疗AI落地及临床辅助决策系统开发者参考
截肢者假肢接受腔的质量依赖于假肢师的技能,因装配过程为手动操作。本研究探索多种人工智能(AI)方法以实现截肢接受腔设计的标准化。数据来自荷兰医疗系统中的118名患者,包含残肢的三维(3D)扫描及其对应的假肢师设计的3D接受腔模型。通过形态模型和主成分分析进行对齐、标准化与可选压缩等预处理。随后构建三种算法:3D神经网络、前馈神经网络与随机森林,分别用于预测1)最终接受腔形状,或2)假肢师基于残肢3D扫描所做的适配调整。通过两种指标结合误差位置评估性能:一是表面到表面距离,衡量整体表面误差;二是距离图,分析误差分布位置。所有算法中,预测适配调整的表现优于直接预测最终形状。随机森林在适配预测中误差最小,中位表面距离为1.24毫米,第一四分位数为1.03毫米,第三四分位数为1.54毫米。
原文摘要 · Abstract (English)
The quality of a transtibial prosthetic socket depends on the prosthetist's skills and expertise, as the fitting is performed manually. This study investigates multiple artificial intelligence (AI) approaches to help standardize transtibial prosthetic socket design. Data from 118 patients were collected by prosthetists working in the Dutch healthcare system. This data consists of a three-dimensional (3D) scan of the residual limb and a corresponding 3D model of the prosthetist-designed socket. Multiple data pre-processing steps are performed for alignment, standardization and optionally compression using Morphable Models and Principal Component Analysis. Afterward, three different algorithms - a 3D neural network, Feedforward neural network, and random forest - are developed to either predict 1) the final socket shape or 2) the adaptations performed by a prosthetist to predict the socket shape based on the 3D scan of the residual limb. Each algorithm's performance was evaluated by comparing the prosthetist-designed socket with the AI-generated socket, using two metrics in combination with the error location. First, we measure the surface-to-surface distance to assess the overall surface error between the AI-generated socket and the prosthetist-designed socket. Second, distance maps between the AI-generated and prosthetist sockets are utilized to analyze the error's location. For all algorithms, estimating the required adaptations outperformed direct prediction of the final socket shape. The random forest model applied to adaptation prediction yields the lowest error with a median surface-to-surface distance of 1.24 millimeters, a first quartile of 1.03 millimeters, and a third quartile of 1.54 millimeters.
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