Optimal configurations of an electromagnetic tracking system for 3D ultrasound imaging of pediatric hips – A phantom study

IF 1.7 4区 医学 Q3 ENGINEERING, BIOMEDICAL
Thanh-Tu Pham , Lawrence H. Le , John Andersen , Edmond H. Lou
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引用次数: 0

Abstract

Tracking the position and orientation of a two-dimensional (2D) ultrasound scanner to reconstruct a 3D volume is common, and its accuracy is important. In this study, a specific miniaturized electromagnetic (EM) tracking system was selected and integrated with a 2D ultrasound scanner, which was aimed to capture hip displacement in children with cerebral palsy. The objective of this study was to determine the optimum configuration, including the distance between the EM source and sensor, to provide maximum accuracy. The scanning volume was aimed to be 320 mm × 320 mm × 76 mm. The accuracy of the EM tracking was evaluated by comparing its tracking with those from a motion capture camera system. A static experiment showed that a warm-up time of 20 min was needed. The EM system provided the highest precision of 0.07 mm and 0.01° when the distance between the EM source and sensor was 0.65 m. Within the testing volume, the maximum position and rotational errors were 2.31 mm and 1.48°, respectively. The maximum error of measuring hip displacement on the 3D hip phantom study was 4 %. Based on the test results, the tested EM system was suitable for 3D ultrasound imaging of pediatric hips to assess hip displacement when optimal configuration was used.

用于小儿髋部三维超声成像的电磁跟踪系统的最佳配置 - 一项模型研究
跟踪二维(2D)超声波扫描仪的位置和方向以重建三维容积是一种常见的方法,其准确性非常重要。本研究选择了一种特定的微型电磁(EM)跟踪系统,并将其与二维超声扫描仪集成,旨在捕捉脑瘫儿童的髋关节位移。这项研究的目的是确定最佳配置,包括电磁源和传感器之间的距离,以提供最高的精确度。扫描体积设定为 320 毫米 × 320 毫米 × 76 毫米。通过将电磁追踪与运动捕捉摄像系统的追踪进行比较,评估了电磁追踪的准确性。静态实验表明,需要 20 分钟的预热时间。当电磁源和传感器之间的距离为 0.65 米时,电磁系统的最高精度分别为 0.07 毫米和 0.01°。在三维髋关节模型研究中,测量髋关节位移的最大误差为 4%。根据测试结果,在使用最佳配置的情况下,测试的电磁系统适用于小儿髋关节的三维超声成像,以评估髋关节位移。
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
Medical Engineering & Physics
Medical Engineering & Physics 工程技术-工程:生物医学
CiteScore
4.30
自引率
4.50%
发文量
172
审稿时长
3.0 months
期刊介绍: Medical Engineering & Physics provides a forum for the publication of the latest developments in biomedical engineering, and reflects the essential multidisciplinary nature of the subject. The journal publishes in-depth critical reviews, scientific papers and technical notes. Our focus encompasses the application of the basic principles of physics and engineering to the development of medical devices and technology, with the ultimate aim of producing improvements in the quality of health care.Topics covered include biomechanics, biomaterials, mechanobiology, rehabilitation engineering, biomedical signal processing and medical device development. Medical Engineering & Physics aims to keep both engineers and clinicians abreast of the latest applications of technology to health care.
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