I have a MRI image of a water bottle with air around it. The water is homogeneous. These are "modulus" scans. The air which should give a signal of zero (and noise) gives only positive values. Thus the noise itself seems to have a "signal" and noise. How do I calculate the SNR (signal to noise ratio) of the water? Thanks.
2007-01-23 09:32:06 · 1 answers · asked by Peter R 2 in Science & Mathematics ➔ Physics
Dear Peter,
Are you looking at the envelope of your NMRI or at a rectified signal.
Compare the Noise(air) amplitude with the Water amplitude to get the SNR. and take logs *10 to get it in dB's
It is best to look at the output on an oscillograph rather than a meter as this will give you a better 'feeling' for what is going on!
Modify your answer to describe your setup and readings, so people can give you a better answer!
2007-01-24 09:19:06 · answer #1 · answered by Rufus Cat 4 · 0⤊ 0⤋