SPMers,
Can someone help with the following message? I have a two group PET
activation study. I used a Condition x Subject model to generate con.img's
for each subject to take to a second (RFX) level analysis. When I enter
these two groups into this model, however, the analysis proceeds until the
last image plane/plank, and produces the following error output.
Warning: No inmask voxels - empty analysis!
> In C:\Program Files\spm99\spm_spm.m at line 1074
In C:\Program Files\spm99\spm_spm_ui.m at line 1427
Design parameters : ...intrinsic
autocorrelation ...V, & traces ...scaling DesMtx
...closing image files ...smoothnessWarning: Divide by zero.
> In C:\Program Files\spm99\spm_spm.m at line 1137
In C:\Program Files\spm99\spm_spm_ui.m at line 1427
Warning: Divide by zero.
> In C:\Program Files\spm99\spm_spm.m at line 1138
In C:\Program Files\spm99\spm_spm_ui.m at line 1427
??? Index exceeds matrix dimensions.
Error in ==> C:\Program Files\spm99\spm_spm.m
On line 1142 ==> FWHM = FWHM*((RESEL/prod(FWHM(1:N))).^(1/N));
Error in ==> C:\Program Files\spm99\spm_spm_ui.m
On line 1427 ==> spm_spm(VY,xX,xM,F_iX0,xC,xsDes)
By the first line, it appears to suggest that there are no voxels to
analyze. I submitted each of the groups separately, as well as one entire
group, to a one sample t-test to test the con.img's against a null
hypothesis and it works fine, producing the expected results. Thus, there
doesn't appear to be a particular problem with the images themselves.
Suggestions?
Thanks all.
________________________________
David A. Kareken, Ph.D., ABPP
Assistant Professor & Director
Neuropsychology Section, Department of Neurology
RI 5999C
Indiana University School of Medicine
Indianapolis, IN 46202
(317) 274-7327 (voice)
(317) 274-1337 (fax)
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