I would like to add respiration data as a nuisance regressor to a resting state fMRI analysis. As the fMRI data is recorded at a frequency of 0.5 Hz (TR = 2000ms) the respiration data has to be down-sampled from its 1000 hz.
I am currently struggling to decide on a down-sampling method. My current preferred choice is MATLAB's decimate function which simply decreases the sampling rate and automatically applies appropriate low-pass filters to avoid aliasing.
I was, however, hoping to find a more nuanced filter which averages values in certain ranges rather than cut them out entirely.
Any suggestions?
This would be a great question to post in our new free medical imaging question and answer forum ( www.imagingQA.com ), there are a number of fMRI experts in the community. If useful, please feel free to open a new topic at the link below :
https://community.imagingqa.com/c/questions/5
Ask Anders Ohlhues (Copenhagen University Hospital - Roskilde), R&D engineer for advice. He was one of the first to set up respiratory gating and make it work.
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