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While the multiexponential nature of T2 decays measured in vivo is wellknown, characterizing T2 decays by a single time constant is still very usefulwhen differentiating among structures and pathologies in MRI images. A novel,robust, fast and very simple method is presented for both estimating anddisplaying the average time constant for the T2 decay of each pixel from amultiecho MRI sequence. The average time constant is calculated from theaverage of the values measured from the T2 decay over many echoes. For amonoexponential decay, the normalized decay average varies monotonically withthe time constant. Therefore, it is simple to map any normalized decay averageto an average time constant. This method takes advantage of the robustness ofthe normalized decay average to both artifacts and multiexponential decays.Color intensity projections (CIPs) were used to display 32 echoes acquired at a10ms spacing as a single color image. The brightness of each pixel in eachcolor image was determined by the intensity of the corresponding pixel in theearliest image and the hue was determined by the normalized decay average.Examples demonstrate the effectiveness of using CIPs to display the results ofa multiecho sequence for a healthy subject and a multiple sclerosis patient.

A very simple, robust and fast method for estimating and displaying  average time constants of T2 decays from multiecho MRI images using color  intensity projections