Prerequisites
You will have to successfully obtain the dcm4jboss-all collection of dcm4chee modules from CVS:
cvs -d:pserver:anonymous@dcm4che.cvs.sourceforge.net:/cvsroot/dcm4che login cvs -z3 -d:pserver:anonymous@dcm4che.cvs.sourceforge.net:/cvsroot/dcm4che co -P dcm4jboss-all
Once you have done that, you need to build the software. At this point you're ready to start working within Eclipse.
Importing dcm4chee projects into Eclipse
It is recommended that you have an Eclipse workspace dedicated to dcm4che, since dcm4che may have different JVM and code formatting settings, as well as different classpath variables than your other projects.
Assuming you are starting with a clean workspace, import the code formatting settings from this wiki.