Denne forskel er ofte en grundlæggende opfattelse af magnetisk resonans (MRI). Det er afgørende, at den særlige hyppighed af kernernes resonans er placeret på et magnetfelt. Differentierede kerner har forskellige magnetiske egenskaber, hvilket resulterer i, at Larmos unikke frekvens er den mest hensigtsmæssige.

Understanding to Larmor Equation

Denne Larmor frequentio (f) er beregnet ved hjælp af ligningen:

1; FLT: 0; FLT: 0; FLT: 3; F = γ × B; 1; FLT: 1; 3;

Det er derfor, at der er behov for en mere præcis definition af de forskellige typer af materialer, der er omfattet af denne forordning.

Calculating fr Different Nuclei

Finde denne Larmor frequency fr a specific nucleus, multiply it s gyromagnetic ratio by the magnetic field d strong. Fr example, dvs. en 3 Tesla MRI scanner:

Fr hydrogen (1; FLT 1; FLT: 0; FLT: 3; FLT: 1; FLT: 3; FLT: 3;), med en gyromagnetic ratio af tilnærmelsesvis 42.58 MHz / T:

1; 1; FLT: 0; 3; f = 42.58 MHz / T × 3 T = 127.74 MHz; 1; FLT: 1; 3;

Disse er ofte i orden, fordi de er uegnede til at være hydrogen kerne during fantasy. Differentierede nuclei, such ah as carbon (# 1; FLT: 0; MR: 3; MR: 1; MR: 1; FLT: 1; MR: 3; MR: 3;) eller phosphorus (# 1; MR: 2; MR: 3; MR: 3; MR: 3; MR: 3; MR: 3;), har forskellige gyromagnetic ratios, resultin: 3; in forskellige resonancer.

Gyromagnetisk forhold i kommun Nuclei

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  • (Carbon): (Carbon): (Carbon): (Carbon): (Carbon): (Carbon): (Carbon): (Carbon): (Carbon); (Carbon): (Carbon): (Carbon); (Carbon): (Carbon): (Carbon): (Carbon): (Carbon); (Carbon); (Carbon): (Carbon): (Carbon); (Carbon); (Carbon); (Carbon); (Carbon): (Carbon): (Carboon: (Carboon); (Carboon): (Carboon); (Carboon); (Carboon: (Carboon); (Carboon): (Carboon); (Carboon: (Carboon); (Carboon); (Carboon); (Carboon): (Carboon: (Carboon); (Carboon): (Car@@
  • (Phosphorus): (Phosphorus): (Phosphorus): (Phosphorus): (Phosphorus): (Phosphorus): (Phosphorus): (Phosphorus): (Phosphorus): (Phosphoruus): (Phosphoruus): (Phosphoruus): (Phosphoruus): (Phosphoruus): (Phosphoruus): (Phosphoruus): (Phosphoruca.
  • (Fluorine): (Fluorine): (Fluorinc): (Fluorinc): (Fluorinc): (Fluorinc): (Fluorinc): (fluorooctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctylenoctansulenoctansulenoctansulenoctansulenoctansulenoctansulenoctansulenoctansulenoctansulenoctansulenoctansulenoctulenoctulenoctulenoctulenoctansulenoctulenoctulenoctulenoctansulenoctansulenoctulenoctulenoctulenoctrat): (Cylenoctansulen@@