Resumen

GALVEZ M, Marcelo; FARIAS A, Mauricio; ASAHI K, Takeshi  y  BRAVO C, Eduardo. CALCULO DE TIEMPOS T1 Y T2 IN VITRO. Rev. chil. radiol. [online]. 2005, vol.11, n.3, pp. 109-115. ISSN 0717-9308.  doi: 10.4067/S0717-93082005000300003.

The present work deals with the standardization of the parameters of different Magnetic Resonance sequences, in order to quantify the values of the relaxation times T₁ y T₂ from the obtained set of images. In vitro images from a 1.5T MR scanner were experimentally obtained for different biological tissues corresponding to muscle, fat and water. From this data the T₁ and T₂ curves were calculated for the different tissues. The sequences correspond to spin-echo by varying TR for T₁, and turbo spin-echo by varying TE for T₂.Finally, the parameters T₁ and T₂ of the corresponding curves of longitudinal and transversal relaxation were obtained by means of the fitting with the exponential theoretical curves. The experimental T₁ values correspond to 951 ms for the muscles, 238 ms for the fat and 2813 ms for the water. The experimental T₂ values correspond to 71ms for the muscles, 81 ms for the fat and 704 ms for the water. These studies show the feasibility of calculating this parameter, in order to be utilized for different quantitative analysis of the images for magnetic resonance

Palabras clave : Echo times; Miliseconds; T₁ relaxation times; T₂ relaxation times; Repetition times; RM signal.