Observed image TE and TR values can be distinguished, TE short for 20ms, long for 80ms, TR short for 600ms, long for 3000 + ms. Short TE short TR for T1-weighted images, and TE. TR T2-weighted images were long, long TR's short TE proton density-weighted images.

Understanding of the water and fat signal characteristics help distinguish T1-weighted images and T2-weighted images, and more valuable, especially in the image does not show the characteristic values of TE and TR. Observed liquid structure such as ventricles, bladder wrist or cerebrospinal fluid, if the liquid is bright, it is possible for T2-weighted images, if the liquid is dark, you might as T1-weighted images. If the liquid is bright, but unlike other structures on T2-weighted images, and TR and TE are short, it may be the gradient echo images.