get_quickshear_mask(brain_mask, buffer = 10, verbose = TRUE)

quickshear_deface_image(file, brain_mask = NULL, buffer = 10,
  verbose = TRUE, ...)

if (have_fsl()) {
   file = "~/Downloads/sample_T1_input.nii.gz"
   if (file.exists(file)) {
       res = quickshear_deface_image(file)
       brain_mask = fslbet(file) > 0
       mask = get_quickshear_mask(brain_mask)
       image = fslmask(file, mask)
   }
}