Program Information
Acquisition of Limited Angle Non-Axial Cone-Beam Computed Tomography Scans to Avoid Projections of Metal Objects That Result in Artifacts
M Hermansen*, F Bova , A Entezari , Univ Florida, Gainesville, FL
Presentations
TU-L-GePD-I-2 (Tuesday, August 1, 2017) 1:15 PM - 1:45 PM Room: Imaging ePoster Lounge
Purpose: Acquire limited angle non-axial cone-beam computed tomography (CBCT) scans to avoid projections of metal objects that result in artifacts due to photon starvation.
Methods: Limited angle non-axial CBCT scan projections were digitally reconstructed using a virtual x-ray simulator with CT images sets as the input. The x-ray simulator was configured to emulate the current intraoperative CBCT scanner geometry. Limited angle non-axial CBCT scans about lateral and anterior-posterior axes were used to avoid imaging along the long axes of pedicle screws, which typically lay in the axial plane. The projections generated were used to reconstruct the three-dimensional (3D) volume via filtered back projection. Slices of the limited angle non-axial CBCT reconstructed 3D volume were compared to the slices of the full axial rotation CBCT reconstructed 3D volume by identifying differences in blurring due the pedicle screws.
Results: The process by which the x-ray projections are simulated and reconstructed has been completed and shown to be spatially accurate. Limited angle non-axial CBCT scans have been successfully simulated and reconstructed using 3D Shepp-Logan phantoms. Results for the reduction of blurring due to metal objects by limited angle non-axial CBCT scan motion is forth coming soon.
Conclusion: Limited angle non-axial scans are soon to be used to limit the blurring due to metal artifacts caused by photon starvation.
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