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Updated: Aug 1, 2026
Making MR Imaging Child's Play - Pediatric Neuroimaging Protocol, Guidelines and Procedure
Published on: July 30, 2009
Reduction of Oxygen-Induced CSF Hyperintensity on FLAIR MR Images in Sedated Children: Usefulness of
1From Philips Korea (H.-K.J.), Seoul, Republic of Korea Korea Basic Science Institute (H.-K.J.), Chungcheongbuk-do, Republic of Korea.
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.
Insights
Magnetization-prepared FLAIR MR imaging effectively reduces oxygen-induced CSF artifacts in sedated children. This advanced technique improves image quality and diagnostic accuracy compared to conventional FLAIR sequences.
Area of Science:
- Radiology
- Medical Imaging
- Neuroimaging
Background:
- Oxygen administration during MRI can cause cerebrospinal fluid (CSF) hyperintensity on FLAIR sequences in sedated children.
- This artifact can mimic leptomeningeal disease, potentially leading to misdiagnosis.
- Conventional FLAIR imaging is susceptible to these oxygen-induced artifacts.
Purpose of the Study:
- To evaluate if magnetization-prepared FLAIR MR imaging can reduce oxygen-induced CSF hyperintensity.
- To assess if this technique improves overall image quality compared to conventional FLAIR.
- To determine the impact on diagnostic accuracy, particularly for hemorrhage detection.
Main Methods:
- Bloch simulations were used to model tissue contrast for both sequence types.
- Retrospective review of 85 children undergoing MRI under anesthesia with supplemental oxygen.
- CSF hyperintensity was scored, and contrast-to-noise ratios (CNRs) were calculated for gray matter (GM), white matter (WM), and CSF.
Main Results:
- Magnetization-prepared FLAIR showed significantly lower CSF hyperintensity scores (P < .01).
- Higher CNRs for GM-WM, GM-CSF, and WM-CSF were observed with magnetization-prepared FLAIR (P < .05).
- Hemorrhage was better demarcated from CSF artifacts using magnetization-prepared FLAIR (100% vs. 38%).
Conclusions:
- Magnetization-prepared 3D-FLAIR MR imaging effectively reduces oxygen-induced CSF artifacts.
- This technique enhances tissue contrast-to-noise ratios beyond conventional FLAIR.
- Magnetization-prepared FLAIR improves diagnostic confidence in pediatric neuroimaging.
