Batch processing images in image J. Attempting to add a series of images - batch-processing

Question

I am attempting to add multiple DICOM images together to for one summated image. This is the code I have come up with so far. It adds the first two images, and saves the new 'sum' image. It will then add one more of the images, but the for loop does not seem to be working and none of the other 17 images in the directory will be added. No error messages are shown.
dir = getDirectory("Choose a Directory ");
list = getFileList(dir);
open(dir+list[0])
open(dir+list[1])
imageCalculator("Add create", list[0], list[1]);
saveAs("Tiff", dir+"Sum.tif");
close();
selectWindow(list[0]);
close();
selectWindow(list[1]);
close();
if (getVersion>="1.40e")
setOption("display labels", true);
setBatchMode(true);
open(dir+"Sum.tif");
for (i=3; i<list.length; i++) {
if (nImages>=1) {
path = dir+list[i];
open(path);
imageCalculator("Add", "Sum.tif", list[i]);
selectWindow(list[i]);
close();
saveAs("Tiff", dir+"Sum1.tif");
}

Answer 1

Script seems like ImageJ macro to me. If I were you I would simplify the task by stacking all your images together and Z-projecting the sum of them, which comes out to something simple:
dir = getDirectory("Choose a Directory ");
list = getFileList(dir);
for (i=0; i<list.length; i++) {
open(dir+list[i]);
}
run("Images to Stack", "name=[Stack of DICOMs] title=[]");
run("Z Project...", "projection=[Sum Slices]");
The product of the above code should change the image type to 32 bit by default to hold larger values if necessary. By the way, you are missing semicolons in your script when opening files. You may not have included all your code because some crucial brackets to end your loops are missing.