Micro-CT image calibration to improve fracture aperture measurement

Geometric Parameters Estimation and Calibration in Cone-Beam Micro-CT

The quality of Computed Tomography (CT) images crucially depends on the precise knowledge of the scanner geometry. Therefore, it is necessary to estimate and calibrate the misalignments before image acquisition. In this paper, a Two-Piece-Ball (TPB) phantom is used to estimate a set of parameters that describe the geometry of a cone-beam CT system. Only multiple projections of the TPB phantom a...

A geometrical calibration method for the PIXSCAN micro-CT scanner

Reconstruction in Cone-Beam Tomography can suffer from artifacts due to geometrical misalignments of the source-detector system. They can be avoided by a complete and precise description of the system. We present a high precision method for the geometric calibration for the PIXSCAN, a small animal X-ray CT scanner demonstrator based on hybrid pixel detectors (XPAD2). The specificities of the XP...

(ct)Interferometric Synthetic Aperture Microscopy

Tibial Tunnel Aperture Irregularity Following Drilling with Five Different Reamer Designs: a Qualitative Micro-CT Analysis

INTRODUCTION: Historically, tibial tunnel creation in ACL reconstruction was performed by antegrade insertion of a tibial guide pin followed by antegrade reaming from the anteromedial tibial metaphysis (distal aperture) to the tibial plateau (proximal aperture). In the last few years retrograde reaming has been introduced.[1, 2] It has been theorized that the retrograde tibial tunnel drilling t...

Aggregating multiple probability intervals to improve calibration

We apply the principles of the “Wisdom of Crowds (WoC)” to improve the calibration of interval estimates. Previous research has documented the significant impact of the WoC on the accuracy of point estimates but only a few studies have examined its effectiveness in aggregating interval estimates. We demonstrate that collective probability intervals obtained by several heuristics can reduce the ...