"Zobrazovac\u00ED techniky zalo\u017Een\u00E9 na principu nukle\u00E1rn\u00ED magnetick\u00E9 rezonance (MR) pat\u0159\u00ED mezi jedny z nejmodern\u011Bj\u0161\u00EDch metod studia fyzik\u00E1ln\u00EDch, chemick\u00FDch a biologick\u00FDch vlastnost\u00ED l\u00E1tek. Univerz\u00E1lnost je p\u0159edur\u010Duje k pou\u017Eit\u00ED v \u0161irok\u00E9m spektru v\u011Bdeck\u00FDch discipl\u00EDn. Velmi d\u016Fle\u017Eit\u00E9 uplatn\u011Bn\u00ED na\u0161la MR v oblasti l\u00E9ka\u0159sk\u00E9. Dif\u00FAzn\u00ED efekty charakterizuj\u00ED pohyb jader v m\u011B\u0159en\u00FDch tk\u00E1n\u00EDch a jsou jedn\u00EDm z d\u016Fle\u017Eit\u00FDch faktor\u016F vzniku zkreslen\u00ED v m\u011B\u0159en\u00E9m obraze. V\u00FDrazn\u011B sni\u017Euj\u00ED velikost spinov\u00E9ho echa v MR m\u011B\u0159ic\u00EDch metod\u00E1ch.. Dif\u00FAzn\u00ED koeficienty je mo\u017En\u00E9 vypo\u010D\u00EDtat ze zm\u011Bny amplitudy v MR obraze. MR zobrazen\u00ED objektu v\u00E1hovan\u00E1 dif\u00FAzn\u00EDmi koeficienty vy\u017Eaduj\u00ED definovan\u00FD pr\u016Fb\u011Bh gradientn\u00EDch impulz\u016F a znalost jejich \u010Dasov\u00E9ho pr\u016Fb\u011Bhu s vysokou p\u0159esnost\u00ED. V metod\u00E1ch m\u011B\u0159en\u00ED dif\u00FAzn\u00EDch koeficient\u016F je po\u017Eadov\u00E1na minim\u00E1ln\u00ED d\u00E9lka n\u00E1b\u011B\u017En\u00FDch i sestupn\u00FDch hran, definovan\u00E1 velikost buzen\u00E9ho gradientu magnetick\u00E9ho pole a tak\u00E9 symetrie kladn\u00FDch a z\u00E1porn\u00FDch gradientn\u00EDch impulz\u016F (nulov\u00FD integr\u00E1l impulz\u016F stejn\u00E9 velikosti s opa\u010Dnou polaritou). K"@cs . . "Testing the quality of magnetic gradient fields for studying self-diffusion processes by magnetic resonance methods"@en . "Bartu\u0161ek, Karel" . . "Z(MSM0021630516)" . "2"^^ . "Testov\u00E1n\u00ED kvalitymagnetick\u00FDch gradientn\u00EDch pol\u00ED pro studium dif\u00FAzn\u00EDch proces\u016F metodami NMR"@cs . . . . . "2"^^ . . "2006" . "26220" . "7"^^ . . . . "RIV/00216305:26220/06:PU58935!RIV06-MSM-26220___" . . "2256-2262" . "503583" . "Testov\u00E1n\u00ED kvalitymagnetick\u00FDch gradientn\u00EDch pol\u00ED pro studium dif\u00FAzn\u00EDch proces\u016F metodami NMR"@cs . "Nuclear magnetic resonance, diffusion coefficients, gradient pulse, spin echo, gradient pulses symmetry."@en . "[6EF2193A69C4]" . "0957-0233" . "Testing the quality of magnetic gradient fields for studying self-diffusion processes by magnetic resonance methods"@en . "RIV/00216305:26220/06:PU58935" . "GB - Spojen\u00E9 kr\u00E1lovstv\u00ED Velk\u00E9 Brit\u00E1nie a Severn\u00EDho Irska" . . . "Measurement Science and Technology (IF = 1.118)" . "Imaging techniques based on the principle of nuclear magnetic resonance (NMR) rank with the most advanced methods for studying chemical and biological properties of substances. Their universality makes them particularly suited for use in a wide range of scientific branches. NMR has found significant application in medicine. The diffusion effects of water molecules in tissues reduce the magnitude of spin echo in NMR measuring methods. Based on the amplitude change in the image, the diffusion coefficientss and their distribution in the specimen being measured can be calculated. MR images of an object weighted by diffusion coefficients require a defined sequence of gradient pulses and an accurate knowledge of their time behaviour. Methods for measuring the diffusion coefficients require the knowledge of the minimum length of leading and trailing edges, the defined magnitude of the magnetic field gradient being excited, and also the symmetry of positive and negative gradient pulses (the zero integral of p" . "Gescheidtov\u00E1, Eva" . . . . "17" . "Imaging techniques based on the principle of nuclear magnetic resonance (NMR) rank with the most advanced methods for studying chemical and biological properties of substances. Their universality makes them particularly suited for use in a wide range of scientific branches. NMR has found significant application in medicine. The diffusion effects of water molecules in tissues reduce the magnitude of spin echo in NMR measuring methods. Based on the amplitude change in the image, the diffusion coefficientss and their distribution in the specimen being measured can be calculated. MR images of an object weighted by diffusion coefficients require a defined sequence of gradient pulses and an accurate knowledge of their time behaviour. Methods for measuring the diffusion coefficients require the knowledge of the minimum length of leading and trailing edges, the defined magnitude of the magnetic field gradient being excited, and also the symmetry of positive and negative gradient pulses (the zero integral of p"@en . . "Testing the quality of magnetic gradient fields for studying self-diffusion processes by magnetic resonance methods" . . "Testing the quality of magnetic gradient fields for studying self-diffusion processes by magnetic resonance methods" .