Hi,
If you want to calculate the sample size, there are some solutions!
Jeanette Mumford made an SPM toolbox for power calculation for ROI's: fmripower.org
And we recently made a web tool for whole-brain inference: https://neuropower.shinyapps.io/neuropower
The main drawback for both is that you actually need a pilot study to compute the sample size, ideally more than 10 subjects. From your e-mail I guess that you didn't collect data on this experiment yet. We're working on solutions, but for now you can always use data from a similar experiment (same contrast) from someone in your lab or from open source data (eg. neurovault).
Best,
Joke
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