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A Spiral Spin-Echo MR Imaging Technique for Improved Flow Artifact Suppression in T1-Weighted Postcontrast Brain Imaging: A Comparison with Cartesian Turbo Spin-Echo.
Li, Z; Hu, H H; Miller, J H; Karis, J P; Cornejo, P; Wang, D; Pipe, J G.
Afiliação
  • Li Z; From the Departments of Imaging Research (Z.L., D.W., J.G.P.) lizhiqiang@gmail.com.
  • Hu HH; Department of Radiology (H.H.H., J.H.M., P.C.), Phoenix Children's Hospital, Phoenix, Arizona.
  • Miller JH; Department of Radiology (H.H.H., J.H.M., P.C.), Phoenix Children's Hospital, Phoenix, Arizona.
  • Karis JP; Radiology (J.P.K.), Barrow Neurological Institute, Phoenix, Arizona.
  • Cornejo P; Department of Radiology (H.H.H., J.H.M., P.C.), Phoenix Children's Hospital, Phoenix, Arizona.
  • Wang D; From the Departments of Imaging Research (Z.L., D.W., J.G.P.).
  • Pipe JG; From the Departments of Imaging Research (Z.L., D.W., J.G.P.).
AJNR Am J Neuroradiol ; 37(4): 642-7, 2016 Apr.
Article em En | MEDLINE | ID: mdl-26611994
BACKGROUND AND PURPOSE: A challenge with the T1-weighted postcontrast Cartesian spin-echo and turbo spin-echo brain MR imaging is the presence of flow artifacts. Our aim was to develop a rapid 2D spiral spin-echo sequence for T1-weighted MR imaging with minimal flow artifacts and to compare it with a conventional Cartesian 2D turbo spin-echo sequence. MATERIALS AND METHODS: T1-weighted brain imaging was performed in 24 pediatric patients. After the administration of intravenous gadolinium contrast agent, a reference Cartesian TSE sequence with a scanning time of 2 minutes 30 seconds was performed, followed by the proposed spiral spin-echo sequence with a scanning time of 1 minutes 18 seconds, with similar spatial resolution and volumetric coverage. The results were reviewed independently and blindly by 3 neuroradiologists. Scores from a 3-point scale were assigned in 3 categories: flow artifact reduction, subjective preference, and lesion conspicuity, if any. The Wilcoxon signed rank test was performed to evaluate the reviewer scores. The t test was used to evaluate the SNR. The Fleiss κ coefficient was calculated to examine interreader agreement. RESULTS: In 23 cases, spiral spin-echo was scored over Cartesian TSE in flow artifact reduction (P < .001). In 21 cases, spiral spin-echo was rated superior in subjective preference (P < .001). Ten patients were identified with lesions, and no statistically significant difference in lesion conspicuity was observed between the 2 sequences. There was no statistically significant difference in SNR between the 2 techniques. The Fleiss κ coefficient was 0.79 (95% confidence interval, 0.65-0.93). CONCLUSIONS: The proposed spiral spin-echo pulse sequence provides postcontrast images with minimal flow artifacts at a faster scanning time than its Cartesian TSE counterpart.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Encéfalo / Imageamento por Ressonância Magnética / Artefatos / Neuroimagem Tipo de estudo: Prognostic_studies Limite: Child / Child, preschool / Female / Humans / Male Idioma: En Ano de publicação: 2016 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Encéfalo / Imageamento por Ressonância Magnética / Artefatos / Neuroimagem Tipo de estudo: Prognostic_studies Limite: Child / Child, preschool / Female / Humans / Male Idioma: En Ano de publicação: 2016 Tipo de documento: Article