Hi Bruce (and others),

We can balance the numbers to allow the same number in each configuration. But just to clarify, are you saying we should do, for example, 10 patient scan 1, 10 patient scan 2, 10 patient scan 3, and 10 HC scan 1, 10 HC scan 2, 10 HC scan 3, to perfectly balance everything out? Or do we just need to have X patient and X HC in scan 1, Y patient and Y HC with scan 2, and Z patient and Z HC with scanning parameter 3?

Thank you for your assistance.

Ashley

On Tue, Mar 11, 2014 at 5:22 PM, Bruce Fischl <fischl@nmr.mgh.harvard.edu> wrote:

Hi Ashley

that is probably trouble unless your groups are perfectly balanced across the datasets (that is, the same # in each group were scanned on each configuration).

cheers
Bruce

On Tue, 11 Mar 2014, Ashley Shurick wrote:

Hi,
I'm interested in comparing CT differences between 2 different groups, and
in order to increase my sample size I'm contemplating combining 3 datasets
with different scanning parameters.

Some scans were collected with a 3T1 with fmri head coil, while others were
collected with a 3T2 magnet with 8 channel head coil. The scans also differ
in FOV (25.6 vs 22cm) and resolution.

Thank you in advance for your support.

Ashley

--
Ashley A. ShurickPh.D. Candidate

Department of Psychology
Stanford University

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Ashley A. Shurick

Ph.D. Candidate

Department of Psychology

Stanford University