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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 Repetition Time

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

What effect does increasing TR have? There would be more time for longitudinal recovery of the net magnetisation, meaning more signal is available to us in the next TR, for the next line of k-space. So an increase in SNR occurs according to the T1 recovery curve.

Tradeoffs: allows an increase in coverage (more slices), less T1 weighting, more proton density and T2 weighting, increases scan time.

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