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An MRI spin-echo sequence is applied to a tissue composed of two tissue typesAandBwithT2 relaxation times ofT2A=200msand T22B=65ms. Make the assumption that the magnitude of

An MRI spin-echo sequence is applied to a tissue composed of two tissue typesAandBwithT2relaxationtimes ofT2A=200msand T22B=65ms. Make the assumption that the magnitude of the transverse magnetization right after application of the transmitting RF pulse is the same in each image voxel independent of the tissue type. Determine the echo time TE that maximizes the contrast between the two tissue types.

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