📇 Rhumatologue · ST JEAN LE BLANC · (45) · Libéral
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Lien Doctolib = recherche Google site:doctolib.fr (le 1er résultat est presque toujours le profil correct s'il existe).
Le infezioni in medicina · 2014
Magnetic resonance in medicine · 2025
Abstract Purpose Although clinical 7T MRI offers various advantages compared to lower field strengths, achieving spatially uniform flip angle distributions remains a challenge. Sampling Perfection with Application optimized Contrast using different flip angle Evolution (SPACE) sequences employing a long train of refocusing pulses with varying flip angles pose a particular challenge in that regard. In this study, we investigate scalable dynamic parallel transmission (pTx) pulses to achieve homogeneous 3D high‐resolution SPACE brain imaging at 7T. Methods Non‐parametrized and scalable dynamic pTx pulses were designed for excitation, refocusing and inversion in SPACE sequences by using fast online customization (FOCUS). First, a database of B 0 and multi‐channel maps were used for optimizing universal pulses and parameters for flip angle homogeneity under strict specific absorption rate (SAR) constraints. During each new examination, B 0 and maps were acquired as additional calibration step and pTx pulses were tailored to the subject. For scalability, a symmetry condition was enforced. T 1 , T 2 , fluid‐attenuated inversion recovery (FLAIR) and double inversion recovery (DIR) SPACE images were acquired in five healthy subjects at 7T using the proposed FOCUS pulses and conventional circularly polarized (CP) pulses for comparison. Results Improved SNR and better image homogeneity were observed in every image acquired with FOCUS pulses in comparison to CP. Quantitative analysis showed a significant reduction in the coefficient of variation (COV) of image intensities in the cerebellum, a region notably affected by inhomogeneities across all contrasts. FLAIR images, for example, exhibited a 46% COV reduction. Conclusion Individually optimized dynamic pTx pulses for 3D high‐resolution SPACE imaging delivered clinically acceptable image homogeneity, enabling the application of widely used clinical contrasts at 7T.
Source PubMed · Recherche par auteur (homonymes possibles, vérifier l'affiliation).
Magnetic resonance in medicine · 2025 · Journal Article
Piredda GF, Sleight E, Yu T, Klauser A, et al.
Panminerva medica · 2003 · Case Reports
Noto R, Panella M, Rapisarda A, Noto P, et al.
Le infezioni in medicina · 2014 · Case Reports
Musso M, Capone A, Chinello P, Di Bella S, et al.