**Acknowledgements**

The author is grateful to the attending physicians, physicists, residents, and staff at the radiation oncology department, at American University of Beirut Medical Center (AUBMC), Lebanon. Most of the clinical aspects provided in this chapter were based on the author's knowledge and experience gained during his residency at AUBMC. The contents are solely representing the author's view. The author also specially thanks the IntechOpen for granting this chapter a full funding for Open-Access publication.
