title: Accuracy of automatic matching of Catphan 504 phantom in cone-beam computed tomography for tube current-exposure time product.
abstract: The purpose of this study is to evaluate the accuracy of automatic matching in cone-beam computed tomography (CBCT) images relative to the reduction of total tube current-exposure time product (mAs) for the X-ray imaging (XI) system. The CBCT images were acquired with the Catphan 504 phantom various total mAs ratios such as 1.00, 0.83, 0.67, 0.57, and 0.50. For studying the automatic match-ing accuracy, the phantom images were acquired with a six-dimensional shifting table. The image quality and correction of automatic matching were compared. With a decreasing total mAs ratio, the noise of the images increased and the low-contrast resolution decreased, while the accuracy of the automatic matching did not change. Therefore, this study shows that a change of the total mAs while acquiring CBCT images has no effect on the automatic matching of Catphan 504 phantom in XI system.
authors.affiliation: Sangji University; Seoul National University Bundang Hospital. won834@naver.com.
authors.forename: Hui-Su
authors.initials: HS
authors.lastname: Won
authors.forename: Jin-Beom
authors.initials: JB
authors.lastname: Chung
authors.forename: Byung-Don
authors.initials: BD
authors.lastname: Choi
authors.forename: Jin-Hong
authors.initials: JH
authors.lastname: Park
authors.forename: Do-Guwn
authors.initials: DG
authors.lastname: Hwang
mesh_terms: D000465:Algorithms; D001331:Automation; D054893:Cone-Beam Computed Tomography / Q000379:methods*; D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D019047:Phantoms, Imaging; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods; D012542:Scattering, Radiation; D014965:X-Rays