Dr. Christoph Luckner Profile

Dr. Christoph Luckner

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Publications (5)

Proceedings Article | 16 March 2020 Presentation + Paper

Slot-scan dual-energy measurement of bone mineral density on a robotic x-ray system

C. Zhao, C. Luckner, M. Herbst, S. Vogt, L. Ritschl, S. Kappler, J. Siewerdsen, W. Zbijewski

Proceedings Volume 11312, 1131205 (2020) https://doi.org/10.1117/12.2549631

KEYWORDS: Bone, X-rays, Dual energy x-ray absorptiometry, Spine, Minerals, Robotics, Robotic systems, Radiography, Sensors, X-ray imaging

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Purpose: We investigate the feasibility of slot-scan dual-energy x-ray absorptiometry (DXA) on robotic x-ray platforms capable of synchronized source and detector translation. This novel approach will enhance the capabilities of such platforms to include quantitative assessment of bone quality using areal bone mineral density (aBMD), normally obtained only with a dedicated DXA scanner. Methods: We performed simulation studies of a robotized x-ray platform that enables fast linear translation of the x-ray source and flat-panel detector (FPD) to execute slot-scan dual-energy (DE) imaging of the entire spine. Two consecutive translations are performed to acquire the low-energy (LE, 80 kVp) and high-energy (HE, 120 kVp) data in <15 sec total time. The slot views are corrected with convolution-based scatter estimation and backprojected to yield tiled long-length LE and HE radiographs. Projection-based DE decomposition is applied to the tiled radiographs to yield (i) aBMD measurements in bone, and (ii) adipose content measurement in bone-free regions. The feasibility of achieving accurate aBMD estimates was assessed using a high-fidelity simulation framework with a digital body phantom and a realistic bone model covering a clinically relevant range of mineral densities. Experiments examined the effects of slot size (1 – 20 cm), scatter correction, and patient size/adipose content (waist circumference: 77 – 95 cm) on the accuracy and reproducibility of aBMD. Results: The proposed combination of backprojection-based tiling of the slot views and DE decomposition yielded bone density maps of the spine that were free of any apparent distortions. The x-ray scatter increased with slot width, leading to aBMD errors ranging from 0.2 g/cm² for a 5 cm slot to 0.7 g/cm² for a 20 cm slot when no scatter correction was applied. The convolution-based correction reduced the aBMD error to within 0.02 g/cm² for slot widths <10 cm. Reproducible aBMD measurements across a range of body sizes (aBMD variability <0.1 g/cm²) were achieved by applying a calibration based on DE adipose thickness estimates from peripheral body sites. Conclusion: The feasibility of accurate and reproducible aBMD measurements on an FPD-based x-ray platform was demonstrated using DE slot scan trajectories, backprojection-domain decomposition, scatter correction, and adipose precorrection.

Proceedings Article | 1 March 2019 Presentation + Paper

Misalignment compensation for ultra-high-resolution and fast CBCT acquisitions

Magdalena Herbst, Christoph Luckner, Julia Wicklein, Jan-Peter Grunz, Tobias Gassenmaier, Ludwig Ritschl, Steffen Kappler

Proceedings Volume 10948, 109481M (2019) https://doi.org/10.1117/12.2513276

KEYWORDS: Image quality, Data acquisition, Image resolution, Visibility, Calibration, Medicine, Diagnostics, X-ray imaging

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Proceedings Article | 1 March 2019 Paper

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, 1094839 (2019) https://doi.org/10.1117/12.2511507

KEYWORDS: Calibration, Distortion, X-rays, Spine, X-ray imaging, Distance measurement, Radiography

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Proceedings Article | 6 July 2018 Paper

Towards an analytic model describing the effect of scan angle and slice thickness on the in-plane spatial resolution of calcifications in digital breast tomosynthesis

Christoph Luckner, Frank Schebesch, Thomas Mertelmeier, Andreas Fieselmann, Andreas Maier, Ludwig Ritschl

Proceedings Volume 10718, 107181R (2018) https://doi.org/10.1117/12.2318099

KEYWORDS: Spatial resolution, Digital breast tomosynthesis, 3D image processing, Breast, Data modeling, X-ray imaging, Error analysis

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Proceedings Article | 9 March 2018 Presentation + Paper

Parallel-shift tomosynthesis for orthopedic applications

Christoph Luckner, Stefan Sesselmann, Thomas Mertelmeier, Andreas Maier, Ludwig Ritschl

Proceedings Volume 10573, 105730G (2018) https://doi.org/10.1117/12.2292384

KEYWORDS: Image filtering, Radiography, Tomography, X-rays, Spine, Calibration, Image resolution, Reconstruction algorithms, Orthopedic imaging

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