Accurate 3D reconstruction of eardrum perforations using Structure from Motion photogrammetry

IF 1.3 4区 医学 Q3 OTORHINOLARYNGOLOGY
Jeremy S. Ruthberg , Nicole Gunderson , Lindsay Boven , Seth Friedman , Michael Barbour , Randall A. Bly
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引用次数: 0

Abstract

Objective

3D reconstruction of the ear canal and eardrum perforations of known dimensions using routine endoscopy and the computer vision algorithm Structure from Motion (SfM) photogrammetry.

Methods

Thirteen 3D-printed ear models were created featuring anterior-inferior perforations (ranging 0.7–4.0 mm). One human patient was also included in data collection. A 3.0 mm 0° rigid endoscope connected to a high-definition camera captured endoscopic videos of eardrum perforations. Optical calibration included a chessboard target in coordination with a reference cylinder placed on the concha cavum. Endoscopy was performed to 1 mm from the eardrum, angling the endoscope 10–15° from the external canal axis. SfM photogrammetry was utilized to generate 3D point clouds for perforation measurements. High-resolution microCT scans (12-μm slice thickness) and 3D printed models served as ground-truths to compare against corresponding SfM eardrum reconstructions.

Results

The average absolute difference between microCT and SfM measurements were 0.09 mm with a percentage error value < 11 % amongst the thirteen 3D printed specimens. Bland-Altman plots demonstrated no bias between large and small perforations. In the live patient, 3D reconstruction measurements (1.87 mm length, 1.41 mm width) deviated approximately 6 % from manual ruler measurements of 2.0 mm and 1.5 mm.

Conclusion

This pilot study demonstrates that SfM can generate highly accurate 3D reconstructions of eardrum perforations of varying sizes in 3D-printed models and one human subject. The promising ability to reconstruct live intraoperative patient data highlights its clinical viability, particularly for adding objective measurements to clinical exam, surgical planning, and potentially patient-specific graft design.

Level of evidence

4.
利用运动摄影测量技术对耳膜穿孔进行精确三维重建
目的利用常规内窥镜和计算机视觉算法对已知尺寸的耳道和鼓膜穿孔进行三维重建。方法采用3d打印耳廓模型13个,耳廓前下穿孔范围0.7 ~ 4.0 mm。数据收集中还包括一名人类患者。3.0 mm 0°刚性内窥镜与高清摄像机连接,拍摄耳膜穿孔的内窥镜视频。光学校准包括一个棋盘目标与放置在耳甲腔上的参考圆柱体协调。内窥镜在距鼓膜1mm处进行,内窥镜与外管轴倾斜10-15°。利用SfM摄影测量技术生成用于射孔测量的三维点云。高分辨率微ct扫描(12 μm切片厚度)和3D打印模型作为基础,与相应的SfM耳膜重建进行比较。结果在13个3D打印标本中,microCT和SfM测量值的平均绝对差值为0.09 mm,百分比误差值为11%。Bland-Altman图显示大孔和小孔之间没有偏倚。在活体患者中,三维重建测量值(长1.87 mm,宽1.41 mm)与手工测量值(2.0 mm和1.5 mm)相差约6%。结论该初步研究表明,SfM可以在3D打印模型和一个人体受试者中生成不同大小的耳膜穿孔的高精度三维重建。重建术中患者实时数据的前景突出了其临床可行性,特别是在临床检查、手术计划和潜在的患者特异性移植物设计中添加客观测量。证据水平4。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.20
自引率
6.70%
发文量
276
审稿时长
62 days
期刊介绍: The purpose of the International Journal of Pediatric Otorhinolaryngology is to concentrate and disseminate information concerning prevention, cure and care of otorhinolaryngological disorders in infants and children due to developmental, degenerative, infectious, neoplastic, traumatic, social, psychiatric and economic causes. The Journal provides a medium for clinical and basic contributions in all of the areas of pediatric otorhinolaryngology. This includes medical and surgical otology, bronchoesophagology, laryngology, rhinology, diseases of the head and neck, and disorders of communication, including voice, speech and language disorders.
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