[en] T₂ images as currently utilized in clinical practice are generally obtined by calculation from two SE images having different parameters. We applied the least square estimation (LSE) to many SE images derived from a multiple SE sequence, to analyze T₂ for individual pixels and to construct T₂, M₀ (0th echo intensity) and error approximation images. Using this method we can not only get high quality T₂ and M₀ images but also appraise the approximation accuracy. Analyses of the T₂ values thus obtained for NiSO₄ solution phantoms (spanning a T₂ range of 40 to 1000 ms) indicate a good linear relation between NiSO₄ conc. and 1/T₂. The greater the number of SE used in the calculation, the smaller the T₂ estimation error value of the calculated images. By utilizing an array processor, we could reduce the T₂ calculation time to 2 or 3 minutes to construct a 256 x 256 image. (author)