X-ray image calibration and its application to clinical orthopedics.

Schumann, Steffen; Thelen, Benedikt; Ballestra, Steven; Nolte, Lutz-Peter; Büchler, Philippe; Zheng, Guoyan (2014). X-ray image calibration and its application to clinical orthopedics. Medical engineering & physics, 36(7), pp. 968-974. Elsevier 10.1016/j.medengphy.2014.04.001

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X-ray imaging is one of the most commonly used medical imaging modality. Albeit X-ray radiographs provide important clinical information for diagnosis, planning and post-operative follow-up, the challenging interpretation due to its 2D projection characteristics and the unknown magnification factor constrain the full benefit of X-ray imaging. In order to overcome these drawbacks, we proposed here an easy-to-use X-ray calibration object and developed an optimization method to robustly find correspondences between the 3D fiducials of the calibration object and their 2D projections. In this work we present all the details of this outlined concept. Moreover, we demonstrate the potential of using such a method to precisely extract information from calibrated X-ray radiographs for two different orthopedic applications: post-operative acetabular cup implant orientation measurement and 3D vertebral body displacement measurement during preoperative traction tests. In the first application, we have achieved a clinically acceptable accuracy of below 1° for both anteversion and inclination angles, where in the second application an average displacement of 8.06±3.71 mm was measured. The results of both applications indicate the importance of using X-ray calibration in the clinical routine.

Item Type:

Journal Article (Original Article)


04 Faculty of Medicine > Pre-clinic Human Medicine > Institute for Surgical Technology & Biomechanics ISTB [discontinued]

UniBE Contributor:

Schumann, Steffen; Thelen, Benedikt; Nolte, Lutz-Peter; Büchler, Philippe and Zheng, Guoyan


500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health








Philippe Büchler

Date Deposited:

17 Dec 2014 14:46

Last Modified:

11 Nov 2015 13:52

Publisher DOI:


PubMed ID:


Uncontrolled Keywords:

3D reconstruction, Calibration, Orthopedics, Pelvis, Spine, X-ray radiograph





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