“mean” vs “integral”

[Marc Grenley]

Can someone explain the exact difference between the “mean” and “integral” settings in the analysis > plot > point > config window. These are the 2 different setting for the middle mouse button.

my assumption is that “mean” gives me the average intensity at each pixel for a chosen m/z range

and that “integral” gives me the area under the curve at each pixel for a chosen m/z range

along these lines if I draw an ROI and get the stats on an image that has not been filtered using either of the above functions i assume I am looking at just the intensity values at each pixel for the exact m/z that i am viewing?

Thanks

marc [img size=498]http://www.maldi-msi.org/images/fbfiles/images/Picture2.jpg[/img]

Attachments:

• Picture2.jpg

[Markus Stoeckli]

Hi Marc

This option is not relvant for MSI data, as you are always presented with a window where you can select the peak option.

ROI stats is done on the the extracted ion image. So depending on what you selected as evaluation criteria (m/z range, mean, max…) you end up with different result.

Markus

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