Reliable measurement of 3D foot bone angles based on the frame-of-reference derived from a sole of the foot

Taeho Kim, Dong Yeon Lee, Jinah Park

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Clinical management of foot pathology requires accurate and robust measurement of the anatomical angles. In order to measure a 3D angle, recent approaches have adopted a landmark-based local coordinate system to establish bone angles used in orthopedics. These measurement methods mainly assess the relative angle between bones using a representative axis derived from the morphological feature of the bone and therefore, the results can be affected by bone deformities. In this study, we propose a method of deriving a global frame-of-reference to acquire consistent direction of the foot by extracting the undersurface of the foot from the CT image data. The two lowest positions of the foot skin are identified from the surface to define the base plane, and the direction from the hallux to the fourth toe is defined together to construct the global coordinate system. We performed the experiment on 10 volumes of foot CT images of healthy subjects to verify that the proposed method provides reliable measurements. We measured 3D angles for talus-calcaneus and talus-navicular using facing articular surfaces of paired bones. The angle was reported in 3 projection angles based on both coordinate systems defined by proposed global frame-of-reference and by CT image planes (saggital, frontal, and transverse). The result shows that the quantified angle using the proposed method considerably reduced the standard deviation (SD) against the angle using the conventional projection planes, and it was also comparable with the measured angles obtained from local coordinate systems of the bones. Since our method is independent from any individual local shape of a bone, unlike the measurement method using the local coordinate system, it is suitable for inter-subject comparison studies.

Original languageEnglish
Title of host publicationMedical Imaging 2016
Subtitle of host publicationComputer-Aided Diagnosis
EditorsGeorgia D. Tourassi, Samuel G. Armato
PublisherSPIE
ISBN (Electronic)9781510600201
DOIs
StatePublished - 1 Jan 2016
EventMedical Imaging 2016: Computer-Aided Diagnosis - San Diego, United States
Duration: 28 Feb 20162 Mar 2016

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume9785
ISSN (Print)1605-7422

Other

OtherMedical Imaging 2016: Computer-Aided Diagnosis
CountryUnited States
CitySan Diego
Period28/02/162/03/16

Fingerprint

Foot Bones
bones
Foot
Bone
Bone and Bones
Talus
Hallux
Calcaneus
Cone-Beam Computed Tomography
Orthopedics
Toes
Pathology
projection
orthopedics
landmarks
Skin
Healthy Volunteers
Joints
pathology
standard deviation

Keywords

  • 3D angle measurement
  • Foot and ankle
  • Frame-of-reference

Cite this

Kim, T., Lee, D. Y., & Park, J. (2016). Reliable measurement of 3D foot bone angles based on the frame-of-reference derived from a sole of the foot. In G. D. Tourassi, & S. G. Armato (Eds.), Medical Imaging 2016: Computer-Aided Diagnosis [97853F] (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9785). SPIE. https://doi.org/10.1117/12.2217388
Kim, Taeho ; Lee, Dong Yeon ; Park, Jinah. / Reliable measurement of 3D foot bone angles based on the frame-of-reference derived from a sole of the foot. Medical Imaging 2016: Computer-Aided Diagnosis. editor / Georgia D. Tourassi ; Samuel G. Armato. SPIE, 2016. (Progress in Biomedical Optics and Imaging - Proceedings of SPIE).
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Kim, T, Lee, DY & Park, J 2016, Reliable measurement of 3D foot bone angles based on the frame-of-reference derived from a sole of the foot. in GD Tourassi & SG Armato (eds), Medical Imaging 2016: Computer-Aided Diagnosis., 97853F, Progress in Biomedical Optics and Imaging - Proceedings of SPIE, vol. 9785, SPIE, Medical Imaging 2016: Computer-Aided Diagnosis, San Diego, United States, 28/02/16. https://doi.org/10.1117/12.2217388

Reliable measurement of 3D foot bone angles based on the frame-of-reference derived from a sole of the foot. / Kim, Taeho; Lee, Dong Yeon; Park, Jinah.

Medical Imaging 2016: Computer-Aided Diagnosis. ed. / Georgia D. Tourassi; Samuel G. Armato. SPIE, 2016. 97853F (Progress in Biomedical Optics and Imaging - Proceedings of SPIE; Vol. 9785).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - Clinical management of foot pathology requires accurate and robust measurement of the anatomical angles. In order to measure a 3D angle, recent approaches have adopted a landmark-based local coordinate system to establish bone angles used in orthopedics. These measurement methods mainly assess the relative angle between bones using a representative axis derived from the morphological feature of the bone and therefore, the results can be affected by bone deformities. In this study, we propose a method of deriving a global frame-of-reference to acquire consistent direction of the foot by extracting the undersurface of the foot from the CT image data. The two lowest positions of the foot skin are identified from the surface to define the base plane, and the direction from the hallux to the fourth toe is defined together to construct the global coordinate system. We performed the experiment on 10 volumes of foot CT images of healthy subjects to verify that the proposed method provides reliable measurements. We measured 3D angles for talus-calcaneus and talus-navicular using facing articular surfaces of paired bones. The angle was reported in 3 projection angles based on both coordinate systems defined by proposed global frame-of-reference and by CT image planes (saggital, frontal, and transverse). The result shows that the quantified angle using the proposed method considerably reduced the standard deviation (SD) against the angle using the conventional projection planes, and it was also comparable with the measured angles obtained from local coordinate systems of the bones. Since our method is independent from any individual local shape of a bone, unlike the measurement method using the local coordinate system, it is suitable for inter-subject comparison studies.

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Kim T, Lee DY, Park J. Reliable measurement of 3D foot bone angles based on the frame-of-reference derived from a sole of the foot. In Tourassi GD, Armato SG, editors, Medical Imaging 2016: Computer-Aided Diagnosis. SPIE. 2016. 97853F. (Progress in Biomedical Optics and Imaging - Proceedings of SPIE). https://doi.org/10.1117/12.2217388