Matthew (and SPMers),
> A friend asked me about the RPV image and its use in statistical
> thresholding. I did a very quick scan of the SPM2 and SPM5 code, and
> couldn't see where it was being used. Did I miss something obvious?
The RPV (RESEL-per-voxel) image is a byproduct of spm_est_smoothness.m
function. This function calculates the average smoothness, to be used as
one of the parameters in the multiple comparison correction in SPM. As a
part of the intermediate steps, this function spits out the RPV image.
Although the RPV image per se is not used in the thresholding process,
the information in the RPV image is averaged and used to determine the
threshold.
Hope this helps.
-Satoru
Satoru Hayasaka PhD ----------
Assistant Professor, Public Health Sciences & Radiology
Wake Forest University School of Medicine
(ph) +1-336-716-8504 / (fax) +1-336-716-0798
(email) shayasak _at_ wfubmc _dot_ edu
|