Assessment of measurement deviations: length-extended x-ray imaging for orthopedic applications

Christoph Luckner; Magdalena Herbst; Ludwig Ritschl; Andreas Maier; Steffen Kappler

doi:10.1117/12.2511507

1 March 2019 Assessment of measurement deviations: length-extended x-ray imaging for orthopedic applications

Christoph Luckner, Magdalena Herbst, Ludwig Ritschl, Andreas Maier, Steffen Kappler

Proceedings Volume 10948, Medical Imaging 2019: Physics of Medical Imaging; 1094839 (2019) https://doi.org/10.1117/12.2511507
Event: SPIE Medical Imaging, 2019, San Diego, California, United States

Abstract

Measurements of skeletal geometries are a crucial tool for the assessment of pathologies in orthopedics. Usually, those measurements are performed in conventional 2-D X-ray images. Due to the cone-beam geometry of most commercially available X-ray systems, effects like magnification and distortion are inevitable and may impede the precision of the orthopedic measurements. In particular measurements of angles, axes, and lengths in spine or limb acquisitions would benefit from a true 1-to-1 mapping without any distortion or magnification. In this work, we developed a model to quantify these effects for realistic patient sizes and clinically relevant acquisition procedures. Moreover, we compared the current state-of-the-art technique for the imaging of length- extended radiographs, e. g. for spine or leg acquisitions (i. e. the source-tilt technique) with a slot-scanning method. To validate our model we conducted several experiments with physical as well as anthropomorphic phantoms, which turned out to be in good agreement with our model. To this end, we found, that the images acquired with the reconstruction-based slot-scanning technique comprise no magnification or distortion. This would allow precise measurements directly on images without considering calibration objects, which might be beneficial for the quality and workflow efficiency of orthopedic applications.

Citation Download Citation

Christoph Luckner, Magdalena Herbst, Ludwig Ritschl, Andreas Maier, and Steffen Kappler "Assessment of measurement deviations: length-extended x-ray imaging for orthopedic applications", Proc. SPIE 10948, Medical Imaging 2019: Physics of Medical Imaging, 1094839 (1 March 2019); https://doi.org/10.1117/12.2511507

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