The Use of Smartphone Photogrammetry to Digitise Transtibial Sockets: Optimisation of Method and Quantitative Evaluation of Suitability.
The Use of Smartphone Photogrammetry to Digitise Transtibial Sockets: Optimisation of Method and Quantitative Evaluation of Suitability.
复制标题
使用智能手机摄影测量数字化transobial插座：方法的优化和适用性的定量评估。
DOI：
10.3390/s21248405
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发表时间：
2021-12-16
期刊：
影响因子：
--
通讯作者：
Du X
中科院分区：
文献类型：
--
作者：
Cullen S;Mackay R;Mohagheghi A;Du X
下肢假肢窝的配合度对使用者的舒适度和下肢截肢者的生活质量至关重要。传统上，使用手工制作的基于患者的铸造技术来生产牙套。现代数字技术为这一过程提供了许多优势，并最终改善了截肢者的生活。然而，商业上可用的扫描设备往往是昂贵的和专有的。智能手机摄影测量可以提供一种低成本的替代方案，但目前还没有被广泛接受的假肢窝数字化成像技术。因此，本文旨在确定一种最佳的成像技术，用于全孔摄影测量，并评估由此产生的扫描测量精度。制作了一个3D打印的胫骨窝，以创建数字和物理双胞胎，作为参考模型。打印的插座从360个位置拍摄，并使用简化的遗传算法设计一系列实验，其中使用Autodesk ReCap处理收集的照片。采用最适合技术评估准确性。与数字参考模型相比，插座壁体积、表面积和高度的精度分别为61.63%、99.61%和99.90%。扫描模型的壁厚从顶部的2.075 mm到插座底部的7.758 mm不等，而控制模型的壁厚为2.025 mm。所选择的技术在临床应用中没有显示出足够的准确性，因为接近窝内基部的精度会下降。然而，使用内壁厚度估计，扫描可能足以用于临床使用；假设壁厚均匀。
The fit of a lower limb prosthetic socket is critical for user comfort and the quality of life of lower limb amputees. Sockets are conventionally produced using hand-crafted patient-based casting techniques. Modern digital techniques offer a host of advantages to the process and ultimately lead to improving the lives of amputees. However, commercially available scanning equipment required is often expensive and proprietary. Smartphone photogrammetry could offer a low cost alternative, but there is no widely accepted imaging technique for prosthetic socket digitisation. Therefore, this paper aims to determine an optimal imaging technique for whole socket photogrammetry and evaluate the resultant scan measurement accuracy. A 3D printed transtibial socket was produced to create digital and physical twins, as reference models. The printed socket was photographed from 360 positions and simplified genetic algorithms were used to design a series of experiments, whereby a collection of photos were processed using Autodesk ReCap. The most fit technique was used to assess accuracy. The accuracy of the socket wall volume, surface area and height were 61.63%, 99.61% and 99.90%, respectively, when compared to the digital reference model. The scanned model had a wall thickness ranging from 2.075 mm at the top to 7.758 mm towards the base of the socket, compared to a consistent thickness of 2.025 mm in the control model. The technique selected did not show sufficient accuracy for clinical application due to the degradation of accuracy nearer to the base of the socket interior. However, using an internal wall thickness estimation, scans may be of sufficient accuracy for clinical use; assuming a uniform wall thickness.
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