dir = "/Users/wayne/Downloads/stack/";
run("Close All");
run("Image Sequence...", "open=&dir sort");
rename("t1-head");
run("Image Sequence...", "open=&dir sort");
rename("t2-head");
run("Image Sequence...", "open=&dir sort");
rename("t3-head");
run("Image Sequence...", "open=&dir sort");
rename("t4-head");