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Potential of iterative reconstruction for maxillofacial cone beam CT imaging: technical note
Dmitri Matenine1,2, Marc Kachelriess3,4, Philippe Després5,6
1Laboratoire de recherche en imagerie et orthopédie, Centre de recherche du Centre hospitalier de l'Université de Montréal, 900 St-Denis, Montréal, QC, H2X 0A9, Canada. dmitri.matenine@etsmtl.ca.
Iterative reconstruction shows promise for low-dose maxillofacial cone beam CT (CBCT). A total variation minimization (TV) regularized ordered subsets convex (OSC-TV) method reduced radiation dose and metal artifacts in clinical tests.
Area of Science:
- Medical Imaging
- Radiology
- Cone Beam Computed Tomography
Background:
- Iterative reconstruction (IR) is effective for low-dose CT but not standard in maxillofacial cone beam CT (CBCT).
- This study explores IR for dose and metal artifact reduction in maxillofacial CBCT.
Observation:
- Filtered backprojection (FBP) and an ordered subsets convex (OSC-TV) method were tested on clinical CBCT data.
- Low-dose imaging was simulated using fractions of projection data.
Findings:
- The OSC-TV technique preserved diagnostic information using 50% of projections.
- At 25% of projections, OSC-TV outperformed FBP in reducing streaking and metal artifacts.
Implications:
- OSC-TV demonstrates potential for reducing radiation exposure in maxillofacial CBCT.
- This technique may improve image quality in the presence of metallic restorations.
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