Evaluation of the feasibility of a multisource CBCT for maxillofacial imaging.

Autor:	Xu S; Department of Applied Physical Sciences, University of North Carolina at Chapel Hill; Chapel Hill, NC 27599, United States of America., Li B; Department of Physics and Astronomy, University of North Carolina at Chapel Hill; Chapel Hill, NC 27599, United States of America., Inscoe CR; Department of Physics and Astronomy, University of North Carolina at Chapel Hill; Chapel Hill, NC 27599, United States of America., Bastawros D; Department of Physics and Astronomy, University of North Carolina at Chapel Hill; Chapel Hill, NC 27599, United States of America., Tyndall DA; Department of Diagnostic Sciences, Adams School of Dentistry, University of North Carolina at Chapel Hill; Chapel Hill, NC 27599, United States of America., Lee YZ; Department of Radiology, University of North Carolina at Chapel Hill; Chapel Hill, NC 27599, United States of America., Lu J; Department of Physics and Astronomy, University of North Carolina at Chapel Hill; Chapel Hill, NC 27599, United States of America., Zhou O; Department of Physics and Astronomy, University of North Carolina at Chapel Hill; Chapel Hill, NC 27599, United States of America.
Jazyk:	angličtina
Zdroj:	Physics in medicine and biology [Phys Med Biol] 2023 Aug 14; Vol. 68 (17). Date of Electronic Publication: 2023 Aug 14.
DOI:	10.1088/1361-6560/acea17
Abstrakt:	Objective . The aim of this study was to investigate the feasibility of improving the image quality and accuracy of cone beam computed tomography (CBCT) by replacing the conventional wide cone angle x-ray tube with a distributed x-ray source array positioned in the axial direction. Approach . The multisource CBCT (ms-CBCT) design was experimentally simulated using a benchtop scanner with a carbon nanotube x-ray tube and a flat-panel detector. The source was collimated and translated in the axial direction to simulate a source array with a reduced cone angle for each beam. An adjacent scatter ratio subtraction (ASRS) method was implemented for residual scatter reduction. Several phantoms were imaged using the ms-CBCT and conventional CBCT configurations under otherwise similar conditions. The Requirements of the ms-CBCT design on the x-ray source and detector were evaluated. Main results . Compared to the conventional CBCT, the ms-CBCT design with 8 sources and ASRS significantly improved the image quality and accuracy, including: (1) reducing the cupping artifact from 15% to 3.5%; (2) reducing the spatial nonuniformity of the CT Hounsfield unit values from 38.0 to 9.2; (3) improving the contrast-to-noise ratio of the low contrast objects (acrylic and low density polyethylene inserts) against the water-equivalent background by ∼20% and (4) reducing the root-mean-square error of the HU values by 70%, from 420.1 to 124.4. The imaging dose and scanning time used by the current clinical CBCT for maxillofacial imaging can be achieved by current source and detector technologies. Significance . The ms-CBCT design significantly reduces the scatter and improves the image quality and accuracy compared to the conventional CBCT. (© 2023 Institute of Physics and Engineering in Medicine.)
Databáze:	MEDLINE
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