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MRT des Darms bei Kindern: beschleunigte Bildgebung in einem Atemzug [Pediatric bowel MRI: accelerated parallel imaging in a single breathhold]

Item Type:Article
Title:MRT des Darms bei Kindern: beschleunigte Bildgebung in einem Atemzug [Pediatric bowel MRI: accelerated parallel imaging in a single breathhold]
Creators Name:Hohl, C. and Honnef, D. and Krombach, G. and Ocklenburg, C. and Muehlenbruch, G. and Wenzl, T.G. and Guenther, R.W. and Niendorf, T.
Abstract:PURPOSE: To compare highly accelerated parallel MRI of the bowel with conventional balanced FFE sequences in children with inflammatory bowel disease (IBD). MATERIALS AND METHODS: 20 children with suspected or proven IBD underwent MRI using a 1.5 T scanner after oral administration of 700 -1000 ml of a Mannitol solution and an additional enema. The examination started with a 4-channel receiver coil and a conventional balanced FFE sequence in axial (2.5 s/slice) and coronal (4.7 s/slice) planes. Afterwards highly accelerated (R = 5) balanced FFE sequences in axial (0.5 s/slice) and coronal (0.9 s/slice) were performed using a 32-channel receiver coil and parallel imaging (SENSE). Both receiver coils achieved a resolution of 0.88 x 0.88 mm with a slice thickness of 5 mm (coronal) and 6 mm (axial) respectively. Using the conventional imaging technique, 4 - 8 breathholds were needed to cover the whole abdomen, while parallel imaging shortened the acquisition time down to a single breathhold. Two blinded radiologists did a consensus reading of the images regarding pathological findings, image quality, susceptibility to artifacts and bowel distension. The results for both coil systems were compared using the kappa-(kappa)-coefficient, differences in the susceptibility to artifacts were checked with the Wilcoxon signed rank test. Statistical significance was assumed for p = 0.05. RESULTS: 13 of the 20 children had inflammatory bowel wall changes at the time of the examination, which could be correctly diagnosed with both coil systems in 12 of 13 cases (92 %). The comparison of both coil systems showed a good agreement for pathological findings (kappa = 0.74 - 1.0) and the image quality. Using parallel imaging significantly more artifacts could be observed (kappa = 0.47) without impairing the diagnostic impact. The comparison of the bowel distension showed no significant differences. CONCLUSION: The highly accelerated parallel MRI using the SENSE technique and a 32-channel surface coil enables the examination of the entire bowel in a single breathhold without relevant restrictions in image quality and diagnostic impact.
Keywords:Small Bowel, Inflammation, MR Imaging
Source:RoeFo Fortschritte auf dem Gebiete der Roentgenstrahlen und der neuen bildgebenden Verfahren
ISSN:1438-9029
Publisher:Thieme (Germany)
Volume:180
Number:5
Page Range:402-409
Date:May 2008
Official Publication:https://doi.org/10.1055/s-2008-1027226
PubMed:View item in PubMed

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