Program Information
Multisource X-Ray System for Artifact Reduction in Cone Beam CT
A Becker1*, A Hernandez1 , P Schwoebel2 , J Boone1 , (1) Department of Radiology, University of California Davis, (2) Department of Physics, University of New Mexico Albuquerque and SRI International
Presentations
TU-H-CAMPUS-IT-4 (Tuesday, August 1, 2017) 4:30 PM - 5:30 PM Room: Imaging ePoster Theater
Purpose: To examine the potential of a multisource x-ray system to reduce cone beam artifacts in a cone beam CT acquisition geometry.
Methods: A dedicated breast CT scanner (Doheny), built at our institution, was used to demonstrate the potential of a cone beam CT scanner with multiple x-ray sources in a single x-ray tube housing. A triple thermionic cathode system was simulated in this study, but other multi-source geometry systems are envisioned as well. The x-ray tube is mounted on a vertical actuator on the breast CT system gantry, allowing the single x-ray source to be positioned at different locations in the field of view. Three acquisition geometries where used to acquire the raw cone beam CT data with the x-ray source positions placed 2 cm apart. Data was collected using a 6-cm tall Defrise phantom to demonstrate artifact reduction. The three acquisitions of raw CT data were reconstructed using filtered back projection, aligned and summed. One third of each data set was used in each reconstruction, thereby matching the dose of a typical scan after summation.
Results: The reconstructed CT volume data set using three sources (DS-3) was compared to that produced from a single source (DS-1). The DS-3 image data demonstrated less visible cone beam artifact, and the disks of the Defrise phantom were clearly seen with improved contrast throughout the phantom. Measured contrast along a vertical trace through the Defrise disks increased on average by 255% with DS-3 compared to DS-1.
Conclusion: This physical simulation of a multisource x-ray CT system successfully demonstrated that a reduction in cone beam CT artifacts could be achieved using a multi-source x-ray tube. Significant improvement would be possible in cone beam systems used for facial bone reconstruction, alignment in radiation therapy, and in orthopedic extremity scanning.
Funding Support, Disclosures, and Conflict of Interest: NIH grant: 1 R01 CA214515-01
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