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A carbon nanotube x-ray source array designed for a new multisource cone beam computed tomography scanner.
Li, Boyuan; Inscoe, Christina R; Xu, Shuang; Capo, Timothy; Tyndall, Donald A; Lee, Yueh Z; Lu, Jianping; Zhou, Otto.
Afiliación
  • Li B; Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States of America.
  • Inscoe CR; Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States of America.
  • Xu S; Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States of America.
  • Capo T; Independent Consultant, United States of America.
  • Tyndall DA; Division of Diagnostic Sciences, Adams School of Dentistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States of America.
  • Lee YZ; Department of Radiology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States of America.
  • Lu J; Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States of America.
  • Zhou O; Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States of America.
Phys Med Biol ; 69(7)2024 Mar 26.
Article en En | MEDLINE | ID: mdl-38471174
ABSTRACT
Cone beam computed tomography (CBCT) is known to suffer from strong scatter and cone beam artifacts. The purpose of this study is to develop and characterize a rapidly scanning carbon nanotube (CNT) field emission x-ray source array to enable a multisource CBCT (ms-CBCT) image acquisition scheme which has been demonstrated to overcome these limitations. A CNT x-ray source array with eight evenly spaced focal spots was designed and fabricated for a medium field of view ms-CBCT for maxillofacial imaging. An external multisource collimator was used to confine the radiation from each focal spot to a narrow cone angle. For ms-CBCT imaging, the array was placed in the axial direction and rapidly scanned while rotating continuously around the object with a flat panel detector. The x-ray beam profile, temporal and spatial resolutions, energy and dose rate were characterized and evaluated for maxillofacial imaging. The CNT x-ray source array achieved a consistent focal spot size of 1.10 ± 0.04 mm × 0.84 ± 0.03 mm and individual beam cone angle of 2.4°±0.08 after collimation. The x-ray beams were rapidly switched with a rising and damping times of 0.21 ms and 0.19 ms, respectively. Under the designed operating condition of 110 kVp and 15 mA, a dose rate of 8245µGy s-1was obtained at the detector surface with the inherent Al filtration and 2312µGy s-1with an additional 0.3 mm Cu filter. There was negligible change of the x-ray dose rate over many operating cycles. A ms-CBCT scan of an adult head phantom was completed in 14.4 s total exposure time for the imaging dose in the range of that of a clinical CBCT scanner. A spatially distributed CNT x-ray source array was designed and fabricated. It has enabled a new multisource CBCT to overcome some of the main inherent limitations of the conventional CBCT.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Nanotubos de Carbono Idioma: En Revista: Phys Med Biol Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Nanotubos de Carbono Idioma: En Revista: Phys Med Biol Año: 2024 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido