Hello all,
Am I calculating the parameter for a low pass filter correctly using fslmaths?
I wish to perform a 0.10 Hz low pass filter on 4D dataset. I calculate the lp_sigma as follows:
1/0.10 # convert Hz to sec
10.000000 # FWHM in sec
(1/0.10)/2.35 # convert from FWHM to sigma
4.255319 # sigma in sec
(1/0.10)/2.35/2 # convert from sec to vol; TR = 2s / vol
2.127659 # sigma in vol
fslmaths inVol -bptf -999 2.127659 outVol
Grammar question:
1. Is it 'low pass' filter?
2. Or 'lowpass' filter?
3. Or 'low-pass' filter?
Thank you,
- BettyAnn
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