M. Fuderer, A. J. Duijndam, A. A. Jones, J. M. den Harder, T. H. Rozijn MR development, Philips M... more M. Fuderer, A. J. Duijndam, A. A. Jones, J. M. den Harder, T. H. Rozijn MR development, Philips Medical Systems, Best, Netherlands Introduction At high-frequency MRI (e.g., at 128MHz, 3T), dielectric effects lead to intrinsically non-uniform transmit/receive fields (see, e.g., [1],[2]). At these frequencies, the wavelength within the human body is comparable to its size. RF losses in the body also play an important role. These effects lead to image non-uniformity. This is particularly so in abdominal imaging.
L'invention se rapporte a un dispositif pour imagerie a resonance magnetique MR d'un corp... more L'invention se rapporte a un dispositif pour imagerie a resonance magnetique MR d'un corps (7) place dans un champ magnetique principal stationnaire et sensiblement homogene, ledit dispositif etant dote d'une antenne d'emission RF (6) concue pour emettre des impulsions RF en direction du corps (7), ladite antenne d'emission RF (6) ayant des modes de resonance differents. Afin d'ameliorer l'uniformite des images en imagerie MR de haute resolution, le dispositif (1) de l'invention est concu pour determiner la taille et/ou le facteur de forme du corps (7), et pour acquerir une image MR dudit corps (7) au moyen d'une sequence d'imagerie comportant des impulsions RF, les phases et amplitudes des differents modes de resonance de l'antenne d'emission RF (6) excitee lors de l'exposition aux impulsions RF etant regulees sur la base de la taille et/ou du facteur de forme dudit corps (7).
Nuclear or electron spin magnetic resonance method using multiple radial scans through frequency-... more Nuclear or electron spin magnetic resonance method using multiple radial scans through frequency-space. The problem of insufficient sample density at the higher image frequencies is solved by deriving an edge image, determining a correction image therefrom by using a priori knowledge about the pixel value distribution and using the correction image after Fourier transformation to frequency-space.
M. Fuderer, A. J. Duijndam, A. A. Jones, J. M. den Harder, T. H. Rozijn MR development, Philips M... more M. Fuderer, A. J. Duijndam, A. A. Jones, J. M. den Harder, T. H. Rozijn MR development, Philips Medical Systems, Best, Netherlands Introduction At high-frequency MRI (e.g., at 128MHz, 3T), dielectric effects lead to intrinsically non-uniform transmit/receive fields (see, e.g., [1],[2]). At these frequencies, the wavelength within the human body is comparable to its size. RF losses in the body also play an important role. These effects lead to image non-uniformity. This is particularly so in abdominal imaging.
L'invention se rapporte a un dispositif pour imagerie a resonance magnetique MR d'un corp... more L'invention se rapporte a un dispositif pour imagerie a resonance magnetique MR d'un corps (7) place dans un champ magnetique principal stationnaire et sensiblement homogene, ledit dispositif etant dote d'une antenne d'emission RF (6) concue pour emettre des impulsions RF en direction du corps (7), ladite antenne d'emission RF (6) ayant des modes de resonance differents. Afin d'ameliorer l'uniformite des images en imagerie MR de haute resolution, le dispositif (1) de l'invention est concu pour determiner la taille et/ou le facteur de forme du corps (7), et pour acquerir une image MR dudit corps (7) au moyen d'une sequence d'imagerie comportant des impulsions RF, les phases et amplitudes des differents modes de resonance de l'antenne d'emission RF (6) excitee lors de l'exposition aux impulsions RF etant regulees sur la base de la taille et/ou du facteur de forme dudit corps (7).
Nuclear or electron spin magnetic resonance method using multiple radial scans through frequency-... more Nuclear or electron spin magnetic resonance method using multiple radial scans through frequency-space. The problem of insufficient sample density at the higher image frequencies is solved by deriving an edge image, determining a correction image therefrom by using a priori knowledge about the pixel value distribution and using the correction image after Fourier transformation to frequency-space.
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