Technological advances in the world and in our country have brought many new applications in radiotherapy. Today, there ia a shift from mechanically powered processing devices that use Cobalt-60 as a radiation source to more advanced digital processing devices.

All these innovations have provided advantages in cancer treatment, such as better targeting of the affected area, the ability to administer higher radiation doses, and the preservation of surrounding healthy tissue. However, the effective and safe use of these advanced diagnostic and treatment devices has raised the need for additional procedures.

I have always felt the lack of a single comprehensive source book for quality control procedures related to the devices found in radiation oncology clinics. In an effort to partially address this specific gap, I hope that this book will be beneficial not only for radiation therapy technicians but also for my medical physics colleagues and radiation oncologists who want to gain knowledge about quality control procedures performed on these devices

In anticipation that this book, prepared for the 100th anniversary of our Republic, will contribute to a brighter future filled with science, I would like to thank all the chapter authors.

Assoc. Prof. Songül Çavdar Karaçam