PURPOSE: The purpose of this study was to investigate the appearance and possible cause of an artifact seen in limited-volume cone-beam CT imaging. METHODS: A water-filled plastic cylinder was used as a phantom of the head. A test object was constructed as a bone-equivalent phantom to be imaged. The test object was variously positioned at the center of the phantom and near its margins. CT images of the test object were acquired using a 3DX Accuitomo system. RESULTS: In slice images with the test object positioned near the margin of the phantom, arch-shaped defects or deformities were observed on the side of the object. There was a negative correlation between the artifact and the CT value of the object. The artifact was larger in images scanned with a higher voltage. CONCLUSION: The probability that this artifact is caused by halation from the image intensifier (II) system is suggested.
PURPOSE: The purpose of this study was to investigate the appearance and possible cause of an artifact seen in limited-volume cone-beam CT imaging. METHODS: A water-filled plastic cylinder was used as a phantom of the head. A test object was constructed as a bone-equivalent phantom to be imaged. The test object was variously positioned at the center of the phantom and near its margins. CT images of the test object were acquired using a 3DX Accuitomo system. RESULTS: In slice images with the test object positioned near the margin of the phantom, arch-shaped defects or deformities were observed on the side of the object. There was a negative correlation between the artifact and the CT value of the object. The artifact was larger in images scanned with a higher voltage. CONCLUSION: The probability that this artifact is caused by halation from the image intensifier (II) system is suggested.
Authors: N Ibrahim; A Parsa; B Hassan; P van der Stelt; I H A Aartman; D Wismeijer Journal: Dentomaxillofac Radiol Date: 2013-10-16 Impact factor: 2.419
Authors: R Schulze; U Heil; D Gross; D D Bruellmann; E Dranischnikow; U Schwanecke; E Schoemer Journal: Dentomaxillofac Radiol Date: 2011-07 Impact factor: 2.419
Authors: Gregory M England; Eun-Sang Moon; Jordan Roth; Toru Deguchi; Allen R Firestone; F Michael Beck; Do-Gyoon Kim Journal: Dentomaxillofac Radiol Date: 2016-11-15 Impact factor: 2.419