Iterative denoising accelerated 3D SPACE FLAIR sequence for brain MR imaging at 3T - 04/01/22
, Alexis Vaussy c, Solenn Toupin c, Rémy Barbe a, Stephan Kannengiesser d, Alto Stemmer d, Emmanuel Houdart a, b
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Highlights |
● | A 37% scanning time reduction is obtained with 3D FLAIR while preserving image quality for brain MRI using iterative denoising (ID). |
● | Higher degrees of interobserver agreement for image quality ,are obtained with accelerated FLAIR with ID compared to accelerated FLAIR without ID. |
● | The use of ID reconstruction results in greater SNR and CNR with accelerated 3D FLAIR. |
Abstract |
Purpose |
The purpose of this study was to prospectively evaluate image quality of three-dimensional fluid attenuated inversion recovery (3D-FLAIR) sequence acquired with a high acceleration factor and reconstructed with iterative denoising (ID) for brain magnetic resonance imaging (MRI) at 3-T.
Material and methods |
Patients with brain tumor who underwent brain MRI were consecutively included. Two 3D-FLAIR sequences were successively performed for each patient. A first conventional FLAIR acquisition (conv-FLAIR) was performed with an acceleration factor of 6. The second acquisition was performed with an increased acceleration factor of 9. Two series one without ID (acc-FLAIR) and one with ID (acc-FLAIR-ID) were reconstructed. Two neuroradiologists independently assessed image quality, deep brain nuclei visualization and white matter/gray matter (WM/GM) differentiation on a 4-point scale.
Results |
Thirty patients with brain tumor were consecutively included in this study. There were 16 women and 14 men with a mean age of 54 ± 17 (SD) years (range: 22–78 years). Scanning time of Acc-FLAIR-ID and Acc-FLAIR (4 min 40 sec) was 37% shorter than that of conv-FLAIR (2 min 50 sec) (P < 0.01). Improved image quality score was significantly different for both conv-FLAIR and acc-FLAIR-ID compared to acc-FLAIR (P < 0.01 for both). WM/GM differentiation score of conv-FLAIR was not significantly different compared to acc-FLAIR-ID (P = 0.10). Improved WM/GM differentiation score was different for both sequences compared to acc-FLAIR (P = 0.017 and P < 0.001). Deep brain nuclei visualization score was not different between conv-FLAIR and acc-FLAIR-ID (P = 0.71). However, the improved deep brain nuclei visualization score was significantly different for both sequences compared to acc-FLAIR (P < 0.001 for both).
Conclusion |
Scanning time of 3D-FLAIR sequence using a high acceleration factor reconstructed with ID algorithm can be reduced by 37% while preserving image quality for brain MRI.
Le texte complet de cet article est disponible en PDF.Keywords : Magnetic resonance imaging (MRI), 3D FLAIR, Iterative denoising, Brain MRI
Abbreviations : 3D, FLAIR, acc-FLAIR, acc-FLAIR-ID, CAIPIRINHA, CI, CNR, conv-FLAIR, CS, GRAPPA, ID, MPRAGE, MRI, PI, SD, SENSE, SNR, SPACE, STROBE, VIBE, WM/GM, TSE
Plan
Vol 103 - N° 1
P. 13-20 - janvier 2022 Retour au numéro
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