open-discussion > BioImage Suite Objectmap Overlap Measurement
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Feb 16, 2012 10:02 AM | BioImage Suite Objectmap Overlap Measurement Dear NITRC Community, I'm using BioImage Suite software from Yale and my question is related to the 'Compute Overlap' function in the Registration tool kit. I'm simply wondering what formula is used to compute this metric? Is it the Dice measurement or something else? Thank you for your help, Best, N
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Sep 21, 2012 02:09 PM | RE: BioImage Suite Objectmap Overlap Measurement This was the answer I received via email (on Feb16) from Prof. Xenophon Papademetris: The overlap is computed as follows
(bis_computeoverlap in BIS 3.0)
1. Following optional reslicing (if a transformation is used), the images are smoothed (using sigma) 2. Then they are both thresholded at 50% of their intensity. 3. Then two overlaps are computed overlap = 100.0 * $vae / ( $va + $ve - $vae ) overlap2 = 100.0 * $vae / ( 0.5 * ( $va + $ve ) ) Where va=volume of structure in image 1, ve=volume of structure in image 2 and vae is the intersection. Xenios
Apologies for delay in posting it. N
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