Posted by
Romain Guiet on
Oct 08, 2015; 2:30pm
URL: http://imagej.273.s1.nabble.com/Help-measuring-migration-through-neurospheres-tp5014350p5014581.html
Hi smrpre,
you will find below a small macro that could be a starting point.
It's far from being "perfect", but it could give you relatively "good" approximation.
Up to now it's just measure area. thus (dead / round cells) around your sphere are also counted. But you could easily add an "analyse particles" to clean them all if you wish.
There is a couple of parameters you can tune, size of the gaussian blur, threshold methods ...
Copy and paste the code below in a macro editor
open your image
press run
Regards,
Romain
////////////////////////////////////////////////////////////////////////////// start of the macro
userSelection = false ;
////////////////////////////////////////////////////////////////////////////// set the measurements
run("Set Measurements...", "area limit display redirect=None decimal=3"); // area, limited to threshold, display label
title = getTitle();
run("8-bit"); // the image is RGB, convert it to 8-bit because it's grey anyway
////////////////////////////////////////////////////////////////////////////// detect the inner core
innerImageName = title+"-inner";
run("Duplicate...", "title="+innerImageName); // duplicate the image with an explicite name
run("Gaussian Blur...", "sigma=20"); // blur it
run("Threshold..."); // threshold
setAutoThreshold("Default dark"); // intermodes gives also a good approximation
if (userSelection){ // if you declare userSelection = true (line 1),
waitForUser("Please Select a threshold"); // you can select a threshold,
} // (should be the same for all the images zou would like to compare)
//
run("Measure"); // measure the delimited area
setOption("BlackBackground", true); // make a binary image of it
run("Convert to Mask"); //
////////////////////////////////////////////////////////////////////////////// detect the sprout
selectImage(title);
run("FeatureJ Edges", "compute smoothing=1.0 lower=[] higher=[]"); // detect the edges to detect the cells contours and protrusion
setAutoThreshold("Li dark"); // threshold
setOption("BlackBackground", true); //
run("Convert to Mask"); //
run("Gaussian Blur...", "sigma=5"); // blur it, because there is a lot of artifacts (coating agggregates ?)
setAutoThreshold("Default dark"); // threshold again, Yen is a bit more permissive
expandImageName = title+"-sprout";
rename(expandImageName);
if (userSelection){ // if you declare userSelection = true (line 1),
waitForUser("Please Select a threshold"); // you can select a threshold,
} // (should be the same for all the images zou would like to compare)
run("Measure"); // measure the delimited area
setOption("BlackBackground", true); // make a binary image of it
run("Convert to Mask"); //
/////////////////////////////////////////////////////////////////////////////// create an output image
run("Merge Channels...", "c1=["+innerImageName+"] c2=["+expandImageName+"]");// merge the two mask
selectImage("RGB");
rename(title+"_output"); // rename it
run("Add Image...", "image=["+title+"] x=0 y=0 opacity=80"); // add the original image as an overlay
////////////////////////////////////////////////////////////////////////////// end of the macro
---------------------------------------------------------------
Dr. Romain Guiet
Bioimaging and Optics Platform (PT-BIOP)
Ecole Polytechnique Fédérale de Lausanne (EPFL)
Faculty of Life Sciences
Station 19, AI 0140
CH-1015 Lausanne
Phone: [+4121 69] 39629
http://biop.epfl.ch/---------------------------------------------------------------
________________________________________
De : ImageJ Interest Group [
[hidden email]] de la part de smrpre [
[hidden email]]
Envoyé : jeudi 17 septembre 2015 18:49
À :
[hidden email]
Objet : Help measuring migration through neurospheres!
Hello all,
I'm having some issues figuring out an easier way to measure migration via
my neurosphere assay. Essentially, for my assay, I form neurospheres by
plating neural stem cells in absence of any coating substrate. Without
coating, the neural stem cells free float in the media and over time
aggregate to form spheres known as neurospheres. Once spheres are formed in
the suspension, I collect and replate them onto dishes that are coated. The
coating allows for the neurospheres to stick and for cells to migrate out
from the original sphere. An example of what this looks like can be seen
below. <
http://imagej.1557.x6.nabble.com/file/n5014350/1_%281%29.jpg> In
order to quantify migration, I currently measure inner area of the sphere
(which is the bright center) and subtract it from total area of the sphere.
My measurements are done by manually tracing both the inner and outer sphere
in image j using the free hand tool. I trace around all the outer cells and
essentially trace a circle around the inner mass However, as I acquire more
spheres this is becoming very time consuming! Does anyone know of an easier
way to do this????
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