Reduction of Oxygen-Induced CSF Hyperintensity on FLAIR MR Images in Sedated Children: Usefulness of Magnetization-Prepared FLAIR Imaging
| Autor: | Seung Koo Lee, Jinna Kim, Ha-Kyu Jeong, Sung Jun Ahn, Se Won Oh |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Adult
Male medicine.medical_specialty Supplemental oxygen Conscious Sedation Diagnostic accuracy Fluid-attenuated inversion recovery Pediatrics 030218 nuclear medicine & medical imaging 03 medical and health sciences Meninges 0302 clinical medicine Cerebrospinal fluid medicine Humans Radiology Nuclear Medicine and imaging Child Cerebrospinal Fluid Retrospective Studies medicine.diagnostic_test business.industry Magnetic resonance imaging Middle Aged equipment and supplies Magnetic Resonance Imaging Mr imaging Hyperintensity Oxygen Female Neurology (clinical) Radiology Deep Sedation Mr images Artifacts Nuclear medicine business human activities 030217 neurology & neurosurgery |
| Zdroj: | AJNR Am J Neuroradiol |
| ISSN: | 1936-959X 0195-6108 |
| DOI: | 10.3174/ajnr.a4723 |
| Popis: | BACKGROUND AND PURPOSE: Oxygen-induced CSF hyperintensity on FLAIR MR imaging is often observed in sedated children. This phenomenon can mimic leptomeningeal pathology and lead to a misdiagnosis. The purpose of this study was to investigate whether magnetization-prepared FLAIR MR imaging can reduce oxygen-induced CSF hyperintensity and improve image quality compared with conventional (non-magnetization-prepared) FLAIR MR imaging. MATERIALS AND METHODS: Bloch simulation for magnetization-prepared and non-magnetization-prepared FLAIR sequences was performed for tissue contrast. We retrospectively reviewed 85 children with epilepsy who underwent MR imaging under general anesthesia with supplemental oxygen (41 with non-magnetization-prepared FLAIR and 44 with magnetization-prepared FLAIR). CSF hyperintensity was scored from 0 to 3 points according to the degree of CSF signal intensity and was compared between the 2 sequences. The contrast-to-noise ratios among GM, WM, and CSF were evaluated to assess general image quality from both sequences. To assess the diagnostic accuracy for hemorrhage, we reviewed an additional 25 patients with hemorrhage. RESULTS: Bloch simulation demonstrated that CSF hyperintensity can be reduced on magnetization-prepared FLAIR compared with non-magnetization-prepared FLAIR. CSF hyperintensity scores were significantly lower in magnetization-prepared FLAIR than in non-magnetization-prepared FLAIR (P < .01). The contrast-to-noise ratios for GM-WM, GM-CSF, and WM-CSF were significantly higher in magnetization-prepared FLAIR than in non-magnetization-prepared FLAIR (P < .05). Hemorrhage was clearly demarcated from CSF hyperintensity in the magnetization-prepared group (100%, 12/12) and non-magnetization-prepared group (38%, 5/13). CONCLUSIONS: Magnetization-prepared 3D-FLAIR MR imaging can significantly reduce oxygen-induced CSF artifacts and increase the tissue contrast-to-noise ratio beyond the levels achieved with conventional non-magnetization-prepared 3D-FLAIR MR imaging. |
| Databáze: | OpenAIRE |
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