High-accuracy photogrammetric technique for human spine measurement

Chong, Albert K. and Milburn, Peter and Newsham-West, Richard and Ter Voert, Marieke (2009) High-accuracy photogrammetric technique for human spine measurement. Photogrammetric Record, 24 (127). pp. 264-279. ISSN 0031-868X

Abstract

Close range photogrammetry has been recognised as an essential tool for the capture of high-accuracy spatial data for medical applications, in particular work involving dynamic human body parts such as limbs. Offline and online photogram-metric systems are readily available for a number of common applications. However, off-the-shelf systems are not always appropriate because of project site conditions. To achieve high measurement accuracy in a field environment, a modified field camera calibration technique was introduced. The technique is particularly important where each camera is limited to one captured image during calibration, as the camera and the calibration testfield are in fixed positions. In this paper a custom-built imaging system designed for the study of the human spine in an outdoor environment is introduced. The discussion addresses: (1) imaging system design; (2) modified field calibration techniques; and (3) a case study on human spines. Two field camera calibration techniques were evaluated, both of which improved the accuracy of the prototype system, the use of a detachable target board offering the best results. This modified camera calibration procedure has improved the 3D measurement accuracy from 1.25 ± 0.3mm to 0.43 ± 0.1 mm. The improvement is at a level achievable in the laboratory. The technique is considered to provide accurate and reliable anthropometric landmark measurement at low cost. This was evaluated in a clinical setting where diurnal changes in spine length and contour were measured in a cohort of 30 university students. The capability of the technique to measure sagittal and frontal angular changes provides a novel way of examining changes in spine shape.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright of Photogrammetric Record is the property of Blackwell Publishing Limited and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use.
Depositing User: Dr Albert Kon-Fook Chong
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Surveying and Land Information
Date Deposited: 29 Jun 2010 02:59
Last Modified: 07 Jul 2014 00:16
Uncontrolled Keywords: anthropometric landmark; field camera calibration; spine measurement
Fields of Research (FOR2008): 11 Medical and Health Sciences > 1116 Medical Physiology > 111602 Human Biophysics
09 Engineering > 0909 Geomatic Engineering > 090905 Photogrammetry and Remote Sensing
11 Medical and Health Sciences > 1106 Human Movement and Sports Science > 110699 Human Movement and Sports Science not elsewhere classified
Socio-Economic Objective (SEO2008): C Society > 92 Health > 9201 Clinical Health (Organs, Diseases and Abnormal Conditions) > 920116 Skeletal System and Disorders (incl. Arthritis)
Identification Number or DOI: doi: 10.1111/j.1477-9730.2009.00540.x
URI: http://eprints.usq.edu.au/id/eprint/6566

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