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Gepubliceerd in: Journal of Foot and Ankle Research 1/2014

Open Access 01-04-2014 | Meeting abstract

Preliminary model-based validation of a biplane fluoroscopy system

Auteurs: Joseph M Iaquinto, Richard Tsai, Quoc-Bao Vu, David R Haynor, Bruce J Sangeorzan, William R Ledoux

Gepubliceerd in: Journal of Foot and Ankle Research | bijlage 1/2014

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Background

Biplane fluoroscopy can directly track the motion of bones and therefore measure joint kinematics. Our prior marker-based work has demonstrated the ability of our system to accurately and precisely track the motion of known objects (i.e., tantalum beads) [1]. In this study, we present the preliminary bone-based validation of our system by tracking the bones of the foot from cadaveric specimens.

Methods

Six bones (two each: calcaneus, talus and first metatarsal) were harvested from cadaveric feet and computed tomography (CT) scans of each bone were obtained. The CT data were used to create digitally reconstructed radiographs (DRRs) of each bone. Bones were attached to a single axis translational stage and imaged at 1000Hz at 13 discrete positions; data were averaged to an effective 100Hz sampling rate. DRRs of each bone were matched to X-ray data from each fluoroscope, and the three-dimensional position of each bone was calculated. Initial positions were manually found prior to the optimization algorithm calculating the “best” pose for every frame of each position (Figure 1). Accuracy is the root mean square (RMS) value of the difference between the software determined position and the known linear stage position. Precision is the standard deviation of the differences between these known and measured positions.

Results

The translational accuracy for the entire data set (6 bones * 13 positions per bone * 10 frames per position = 780 frames) was 0.066mm with a precision of ± 0.062mm (Table 1).
Table 1
Individual bone accuracy and precision values, along with grand values for the six bone set.
 
Calcaneus 1
Calcaneus 2
Talus 1
Talus 2
Metatarsal 1
Metatarsal 2
Grand
Accuracy
0.075
0.026
0.025
0.033
0.023
0.012
0.066
Precision
0.087
0.025
0.029
0.028
0.030
0.018
0.062

Preliminary conclusions

These translational accuracy and precision values match well with other similar dual fluoroscopy systems studying areas of the body such as the spine [2] and knee [3]. Further, these values are an order of magnitude improvement over optical motion capture systems and have the ability to measure kinematics which are traditionally difficult to capture in the foot, such as talar motion. The full model-based validation of this system (which includes rotational and dynamic trials) is currently underway.

Acknowledgements

The work was funded by VA RR&D Grant F7468R.
This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://​creativecommons.​org/​licenses/​by/​4.​0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The Creative Commons Public Domain Dedication waiver (http://​creativecommons.​org/​publicdomain/​zero/​1.​0/​) applies to the data made available in this article, unless otherwise stated.
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Literatuur
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go back to reference Iaquinto JM, Tsai R, Haynor DR, Fassbind MJ, Sangeorzan BJ, Ledoux WR: Marker-based validation of a biplane fluoroscopy system for quantifying foot kinematics. Med Eng Phys. 2013, 24: in press Iaquinto JM, Tsai R, Haynor DR, Fassbind MJ, Sangeorzan BJ, Ledoux WR: Marker-based validation of a biplane fluoroscopy system for quantifying foot kinematics. Med Eng Phys. 2013, 24: in press
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go back to reference Massimini DF, Warner JJ, Li G: Non-invasive determination of coupled motion of the scapula and humerus-- an in-vitro validation. J Biomech. 2011, 44 (3): 408-12. 10.1016/j.jbiomech.2010.10.003.CrossRefPubMed Massimini DF, Warner JJ, Li G: Non-invasive determination of coupled motion of the scapula and humerus-- an in-vitro validation. J Biomech. 2011, 44 (3): 408-12. 10.1016/j.jbiomech.2010.10.003.CrossRefPubMed
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go back to reference Bey MJ, Kline SK, Tashman S, Zauel R: Accuracy of biplane x-ray imaging combined with model-based tracking for measuring in-vivo patellofemoral joint motion. J Orthop Surg Res. 2008, 3 (38): Bey MJ, Kline SK, Tashman S, Zauel R: Accuracy of biplane x-ray imaging combined with model-based tracking for measuring in-vivo patellofemoral joint motion. J Orthop Surg Res. 2008, 3 (38):
Metagegevens
Titel
Preliminary model-based validation of a biplane fluoroscopy system
Auteurs
Joseph M Iaquinto
Richard Tsai
Quoc-Bao Vu
David R Haynor
Bruce J Sangeorzan
William R Ledoux
Publicatiedatum
01-04-2014
Uitgeverij
BioMed Central
Gepubliceerd in
Journal of Foot and Ankle Research / Uitgave bijlage 1/2014
Elektronisch ISSN: 1757-1146
DOI
https://doi.org/10.1186/1757-1146-7-S1-A53

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