Comparison of Optical Handheld 3D Scanners Suitable for Prosthetic and Orthotic Applications

Abstract

3D scanning technology is globally frequently used in the field of prosthetics and orthotics. Techniques and methods using 3D scanners make it easier and faster for CPOs (Certified prosthetic orthotist) to obtain important data for prosthetic and orthotic device design. Nevertheless, in low-income countries, this is still a new approach, and some CPOs might find it hard to trust. Also, the prices of some of these 3D scanning devices and data processing software are too high. Because of these issues, modern methods are being neglected and the whole prosthetic device designing process isn´t advancing. The aim of this study is to compare optical handheld 3D scanners of different brands, designs, and price ranges. A polystyrene model of the human torso with predetermined geometric forms will be scanned with multiple handheld optical 3D scanning devices. For the precision evaluation of the 3D scanners and hand measurement it is necessary to position the reference forms in a way that it will allow measurement by both methods. Selected dimensions must include all three axes of the cartesian coordinate system, so it will be possible to scanners precision in all individual axes. Scanning will be performed by one person in a room with stable lighting and room conditions. The torso model will be scanned by individual scanners and measured by hand 3 times and a mean value and standard deviation will be calculated. The geometric forms will be also used for the alignment of obtained 3D models in VGStudio Max software, which will be used for the analysis process. Distances between predetermined forms on the obtained 3D models will be evaluated. These nominal values will be compared with the actual values from the torso model, which were measured by hand. The quality and surface precision of actual obtained 3D models will be compared to determine the minimal or ideal requirements of optical handheld 3D scanners for the use in the field of prosthetics and orthotics.

Návrh individuálneho chrániča uší prostredníctvom CAD/CAM metódy

“…3D skenovanie bolo vykonané pomocou profesionálneho 3D skenera Artec Eva. Viaceré štúdie boli robené na overenie povrchovej presnosti 3D modelov vygenerovaných týmto skenerom, kde výsledkom bolo, že tento skener je vhodný na odoberanie 3D pozitívov ľudského tela[15,16]. Chránič bol modelovaný v CAD softvéri Autodesk Meshmixer, ktorý je voľne stiahnuteľný, má funkcie vhodné na návrh individuálnych protetických a ortotických pomôcok zariadení a práca s ním je jednoduchá a intuitívna[17].Na výrobu daného chrániča boli zohľadnené 2 metódy aditívnej výroby -FDM alebo MJF.…”