Correlative study of liquid in human bone by 3D neutron microscopy and lab-based X-ray μCT

Maja Østergaard, Estrid Buhl Naver, Delia Schüpbach, Anders Kaestner, Markus Strobl, Annemarie Brüel, Jesper Skovhus Thomsen, Søren Schmidt, Henning Friis Poulsen, Luise Theil Kuhn, Henrik Birkedal*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Liquid plays an important role in bone that has a complex 3D hierarchical pore structure. However, liquid (water) is difficult to discern from e.g. an organic matrix by X-ray imaging. Therefore, we use a correlative approach using both high resolution X-ray and neutron imaging. Human femoral bone with liquid adsorbed into some of the pores was imaged with both the Neutron Microscope at the ICON beamline, SINQ at PSI, and by lab-based μCT using 2.7 μm voxel size. Segmentation of the two datasets showed that, even though the liquid was clearly distinguishable in the neutron data and not in the X-ray data, it remained challenging to segment it from bone due to overlaps of peaks in the gray level histograms. In consequence, segmentations from X-ray and neutron data varied significantly. To address this issue, the segmented X-ray porosities was overlaid on the neutron data, making it possible to localize the liquid in the vascular porosities of the bone sample and use the neutron attenuation to identify it as H2O. The contrast in the neutron images was lowered slightly between the bone and the liquid compared to the bone and the air. This correlative study shows that the complementary use of X-rays and neutrons is very favorable, since H2O is very distinct in the neutron data, while D2O, H2O, and organic matter can barely be distinguished from air in the X-ray data.
Original languageEnglish
Article number116837
JournalBone
Volume175
Number of pages9
ISSN8756-3282
DOIs
Publication statusPublished - 2023

Keywords

  • Neutron microscopy
  • X-ray microscopy
  • Bone vasculature
  • Imaging
  • Tomography

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