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» Pulse Sequences

How do we change image contrast? What are the effects of parameter changes? This section explores image contrast and image acquisition methods.

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SNR and Echo Time

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You decide to try and increase the SNR by decreasing TE. Why might this work? List also any tradeoffs.

Let's think about this. What would decreasing the echo time do? There would be less time for dephasing to occur, and that means a higher signal when we read out the signal echo. So less dephasing produces SNR increase (but not if the TE is reduced by decreasing the sampling time (Tline, for a whole line of k-space): this is a bandwidth increase which includes more noise).

Tradeoffs: less T2 weighting, more T1 or proton density weighting.

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