Three-dimensional quantification of magnetic resonance imaging artifacts associated with shape factors
| Autor: | Yusuke Tsutsumi, Iku Kawabata, Toru Yamamoto, Takao Hanawa, Akemi Tetsumura, Zuisei Kanno, Takashi Ono, Tohru Kurabayashi, Hisashi Doi, Haruki Imai, Maki Ashida |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Titanium
Artifact (error) Materials science genetic structures medicine.diagnostic_test 0206 medical engineering Isotropy Magnetic resonance imaging 030206 dentistry 02 engineering and technology equipment and supplies Magnetic Resonance Imaging 020601 biomedical engineering Imaging phantom Magnetic field 03 medical and health sciences 0302 clinical medicine Nuclear magnetic resonance Ceramics and Composites medicine Artifacts Shape factor Anisotropy Projection (set theory) General Dentistry |
| Zdroj: | Dental Materials Journal. 38:638-645 |
| ISSN: | 1881-1361 0287-4547 |
| DOI: | 10.4012/dmj.2018-197 |
| Popis: | Differences in the volumes of artifacts caused by variously shaped titanium objects on magnetic resonance imaging (MRI) were evaluated. Spherical-, square cubic-, and regular tetrahedron-shaped isotropic, and elongated spherical-, elongated cubic-, and elongated tetrahedron-shaped anisotropic objects, with identical volumes, were prepared. Samples were placed on a nickel-doped agarose gel phantom and covered with nickel-nitrate hexahydrate solution. Three-Tesla MR images were obtained using turbo spin echo and gradient echo sequences. Areas with ±30% of the signal intensity of the standard background value were considered artifacts. Sample volumes were deducted from these volumes to calculate the total artifact volumes. Isotropic samples had similar artifact volumes. For anisotropic samples, the artifact volume increased in proportion with the normalized projection area. MRI artifact size can be reduced by high anisotropic designs, and by positioning the long axis of the metal device as parallel as possible to the magnetic field axis. |
| Databáze: | OpenAIRE |
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