How do we change image contrast? What are the effects of parameter changes? This section explores image contrast and image acquisition methods.
As usual, get out the SNR equation. Change NEX to 2NEX. What is the result on the SNR?
We'll get a √2 increase in SNR if NEX is doubled.
Tradeoff: Longer scan time, disproportionate to increase in SNR.
Further reading on this topic:
Books: Q&A in MRI p99, MRI The Basics p168
Online: MRItutor 1, 2
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