How to reduce the value of SNR?
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Increasing the matrix size will reduce the SNR. Increasing the matrix reduces the voxel size, reducing the amount of signal received by the individual pixels.
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Increasing the TE will reduce the SNR. A long TE will cause the transverse magnetisation to decay to very low values and result in signal loss. Decreasing the TE beyond a certain limit will reduce the T2 effect.
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