title: Clinical evaluation of a newly developed method for avoiding artifacts caused by dental fillings on X-ray CT.
abstract: To evaluate the clinical usefulness of gantry tilt scanning as an image reconstruction technique for avoiding artifacts caused by metallic dental fillings. Gantry tilt scanning was used with multidetector-row computed tomography for imaging in patients with dental fillings. Using a novel PC-based program, the oblique images obtained were reconstructed to transverse images using nearest neighbor and bilinear interpolation methodologies in order to avoid metallic streak artifacts. Coronal images were reformatted with the reconstructed transverse images, and the continuity of the reconstructed images was evaluated. Gantry tilt scanning was performed in 12 patients with metal artifacts, and the original and reconstructed images were classified into four grades and assessed by two radiologists. Results of the clinical evaluation indicated that the original images with artifacts, only 4% had good image quality in the region around the medial pterygoid muscle, only 8% depicted areas around the internal carotid artery and internal jugular vein, and only 12% could depict the areas around the parotid gland in the clinical evaluation. These values were improved to 60, 96, and 100%, respectively, in the reconstructed transverse images. Gantry tilt scanning as an image reconstruction technique improves image quality and removes most, if not all, artifacts caused by metallic dental fillings. The resulting images can be used in the evaluation of oropharyngeal lesions in patients with dental fillings.
authors.affiliation: Department of Clinical Radiology, The Hospital of Hyogo College of Medicine, Nishinomiya, Hyogo, Japan. rt1711@hyo-med.ac.jp
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Nakae
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Sakamoto
authors.forename: Takahiro
authors.initials: T
authors.lastname: Minamoto
authors.forename: Toshiko
authors.initials: T
authors.lastname: Kamakura
authors.forename: Yuji
authors.initials: Y
authors.lastname: Ogata
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Matsumoto
authors.forename: Takeshi
authors.initials: T
authors.lastname: Johkou
mesh_terms: D016477:Artifacts; D002343:Carotid Artery, Internal / Q000000981:diagnostic imaging; D003764:Dental Materials; D003793:Dental Restoration, Permanent; D003794:Dental Restoration, Temporary; D006801:Humans; D007601:Jugular Veins / Q000000981:diagnostic imaging; D009959:Oropharyngeal Neoplasms / Q000000981:diagnostic imaging* / Q000473:pathology; D009960:Oropharynx / Q000000981:diagnostic imaging* / Q000473:pathology; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D015898:Tomography Scanners, X-Ray Computed; D014057:Tomography, X-Ray Computed / Q000295:instrumentation / Q000379:methods*
chemical_list: D003764:Dental Materials
references.citation: Radiology. 1984 Aug;152(2):453-8
references.pmid: 6739814
references.citation: Nihon Hoshasen Gijutsu Gakkai Zasshi. 2006 Jun 20;62(6):863-6
references.pmid: 16799415
references.citation: Br J Radiol. 2005 Jul;78(931):634-6
references.pmid: 15961846
references.citation: Radiology. 1992 Apr;183(1):281-3
references.pmid: 1549687
references.citation: Med Phys. 1981 Nov-Dec;8(6):799-807
references.pmid: 7322078
references.citation: Nihon Hoshasen Gijutsu Gakkai Zasshi. 2007 Mar 20;63(3):326-34
references.pmid: 17409624
references.citation: Nihon Hoshasen Gijutsu Gakkai Zasshi. 2003 Jan;59(1):136-42
references.pmid: 12577011
references.citation: Radiographics. 2004 Nov-Dec;24(6):1679-91
references.pmid: 15537976
references.citation: IEEE Trans Image Process. 2001;10(10):1521-7
references.pmid: 18255495
references.citation: Radiology. 1987 Aug;164(2):576-7
references.pmid: 3602406
references.citation: AJR Am J Roentgenol. 2005 Apr;184(4):1326-31
references.pmid: 15788619
references.citation: Radiographics. 2004 Mar-Apr;24(2):601-13
references.pmid: 15026605
references.citation: Brachytherapy. 2003;2(4):207-14
references.pmid: 15062128
references.citation: Acad Radiol. 2000 Aug;7(8):607-14
references.pmid: 10952111
references.citation: IEEE Trans Med Imaging. 2000 Dec;19(12):1238-47
references.pmid: 11212372