Open Tasha-P opened 4 months ago
Dear @Tasha-P,
I believe you are right, i.e., that the tSNR gains are just relative to the baseline tSNR without using the regressors. Thus, a value of 1.2 would be a gain of 20%.
If you look at the code of tapas_physio_compute_tsnr_gains
, you will see in the header it labels the outputs as [tSnrImageArray, fileTsnrArray, ... tSnrRatioImageArray, fileTsnrRatioArray]
, which means one of the output files will be the absolute tSNR, and the other one relative gain (or ratio) compared to an uncorrected time series.
I am sorry that this is not clearer in the documentation and hope this explanation helps.
All the best, Lars
Dear Lars,
In the Neuroscience methods paper, the tSNR gain maps are expressed in %. I found this a little confusing since the provided explanation for tSNR gains was a reduction factor in the standard deviation, which is "closely" related to the relative explained variance. How then do you interpret the outputs from tapas_physio_compute_tsnr_gains? e.g., if I have a value of 1.2 does that simply mean I have a 20% increase in tSNR?
Thank you,
T