[Homer-users] Additional note on memory usuage/ display

[thuppert]

Sorry to send a third email, but I wanted to add an additional note that
effects both of my previous emails.

HomER allows you to load your data in parts.  If you have (say) 30
source-detector combinations times 2 wavelengths.  You can  load this in as
multiple files.  For example, you can load 3 files with 10 source-detector
combinations (x 2 wavelengths).
Each file can have a subset of the measurement list.  When you are working
with that file, only the src-det pairs in that file (i.e. 10 of the 30) will
be displayed.  However, when you average all, this measurment lists get
concatanated together such that the result will have all src-det pairs (and
use this for imaging etc).

But this allows you to:
1)  Process only a subset of the data at once- Saves RAM

2)  If you aquire multiple configurations (i.e. overlapping measurements),
where you only aquired a subset of the entire probe at once- this lets you
make images that use the entire probe.

3) It could help display the data, since within a file you only need to look
at a subset of the lines.  The AvgAll display will still have all the lines
though.



Note:

Each file must still have the FULL 'SD' variable.

Each file must have all wavelengths (i.e. all wavelengths for a set of
src-det pairs).

The PCA filters work only within a single file... so these filters work best
if all the data is in the same file.




Ted Huppert, M.Sc.

PhD student-Harvard Univ.
Dept of Biophysics
Photon Migration Imaging lab
Mass General Hospital/CNY

Tele: (617)726-1223
Cell: (617) 869-1205

thuppert at nmr.mgh.harvard.edu