Impact of micro-computed tomography reconstruction protocols on bone microarchitecture analysis

Area of Science:

• Biomedical imaging
• Materials science
• Osteology

Background:

• Micro-computed tomography (micro-CT) is essential for evaluating bone microarchitecture.
• Image reconstruction protocols can introduce artifacts, potentially affecting quantitative analyses.
• Standardization of micro-CT protocols is needed for reliable bone parameter measurements.

Purpose of the Study:

• To investigate how different micro-CT reconstruction protocols influence bone microarchitecture parameter calculations.
• To determine the impact of specific artifact correction tools on quantitative micro-CT data.
• To provide insights for standardizing micro-CT image processing in bone research.

Main Methods:

• Micro-CT images of Wistar rat maxillae were reconstructed using varied Smoothing Filter (SF), Ring Artifact Correction (RAC), and Beam Hardening Correction (BHC) levels.
• A control (P0) and a standard protocol (SP) were used for comparison.
• Eight bone microarchitecture parameters (e.g., BV/TV, Tb.N, Tb.Th) were calculated using CTAn software and statistically analyzed.

Main Results:

• Increasing Beam Hardening Correction (BHC) levels inversely affected most microarchitecture parameters, except bone volume/total volume (BV/TV) and trabecular thickness (Tb.Th).
• Combined BHC and Smoothing Filter (SF) significantly altered all parameters except the degree of anisotropy (DA).
• All tested protocols showed similar results for DA compared to the standard protocol.

Conclusions:

• The levels of artifact correction tools, particularly BHC and SF, significantly influence the calculation of bone microarchitecture parameters.
• Variations in reconstruction protocols can lead to discrepancies in quantitative micro-CT results.
• Standardization of artifact correction tool settings is essential for reproducible and accurate bone microarchitecture analysis.