Reduced artefacts and improved assessment of hyperintense brain lesions with BLADE MR imaging in patients with neurofibromatosis type 1
| Autor: | Thekla von Kalle, Bernd Blank, Peter Winkler, Claudia Fabig-Moritz, Katrin Wohlfarth, Michael Zieger, Peter Müller-Abt |
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| Rok vydání: | 2009 |
| Předmět: |
Male
Neurofibromatosis 1 animal structures Adolescent Blade (geometry) media_common.quotation_subject Fluid-attenuated inversion recovery Sensitivity and Specificity stomatognathic system Humans Medicine Contrast (vision) Radiology Nuclear Medicine and imaging In patient Neurofibromatosis Child media_common Neuroradiology Brain Neoplasms business.industry Ultrasound Reproducibility of Results food and beverages Image Enhancement medicine.disease Magnetic Resonance Imaging body regions Child Preschool Pediatrics Perinatology and Child Health Brain lesions Female Artifacts business Nuclear medicine |
| Zdroj: | Pediatric Radiology. 39:1216-1222 |
| ISSN: | 1432-1998 0301-0449 |
| DOI: | 10.1007/s00247-009-1370-y |
| Popis: | Assessment of small brain lesions in children is often compromised by pulsation, flow or movement artefacts. MRI with a rotating blade-like k-space covering (BLADE, PROPELLER) can compensate for these artefacts. We compared T2-weighted FLAIR images that were acquired with different k-space trajectories (conventional Cartesian and BLADE) to evaluate the impact of BLADE technique on the delineation of small or low-contrast brain lesions. The subject group comprised 26 children with neurofibromatosis type 1 (NF 1), who had been routinely scanned at 1.5 T for optic pathway gliomas with both techniques and who had the typical hyperintense brain lesions seen in NF 1. Four experienced radiologists retrospectively compared unlabelled 4-mm axial images with respect to the presence of artefacts, visibility of lesions, quality of contour and contrast. Both techniques were comparable in depicting hyperintense lesions as small as 2 mm independent of contrast and edge definition. Pulsation and movement artefacts were significantly less common with BLADE k-space trajectory. In 7 of 26 patients (27%), lesions and artefacts were rated as indistinguishable in conventional FLAIR, but not in BLADE FLAIR images. BLADE imaging significantly improved the depiction of lesions in T2-W FLAIR images due to artefact reduction especially in the posterior fossa. |
| Databáze: | OpenAIRE |
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