Recruiters are very busy with many jobs to fill, many candidates to research and even more resumes to sort through. That limits the amount of time they have to initially scan your resume. Sure, eventually the "ones" that make it past the first round will be reviewed more thoroughly, at some point. But if your resume is not picked-up initially, then there is no second round for it to be considered.
What can you do to clean up your resume to make sure the right things shine, when it is being quickly scanned? View these tips from reCareed.com to see what you can change now, that make get you a call back!