I have some questions concerning denoising procedure in DTIPrep. Denoise is one of good practice. However, I found there is no difference of the excluded gradients between with and without denoising procedure. 
1. I noticed there is *_DenoiseInput.nrrd file created. I wonder whether and how this denoised file is linked to the DTIPrep output.
2. Is Rician noise removal the same as smoothing in DTIPrep?