**11. Conclusion**

In our days, modern radiation therapy requires technologically advanced equipment and a professional strategy for the treatment of cancer patients in order to achieve the best clinical result, especially when the vision of the European Society for Radiation Therapy and Oncology for 2020 is: "Every cancer patient in Europe will have access to state-of-the-art radiation therapy as part of a multidisciplinary approach in which treatment is individualized for a particular patient's cancer, taking into account the patient's personal circumstances" [38].

Professionalism and morality oblige us to provide safe and effective radiation therapy, i.e. to know, that we are doing everything well, but also to be able to do it even better. Times have changed, mostly for the better. Few could argue with the fact that the tools we work with today are extremely superior and extremely complex than a few years ago. Advances in technology provide more sophisticated, promising and accurate techniques for targeting malignancies, while minimizing normal tissue damage is crucial for patients treated with radiation therapy [39].

Dosimetry audit has been identified in the activities of ESTRO as one of the most important topics, accompanying the improvement of the quality of radiotherapy practice in Europe through standardization [28]. International organizations as the IAEA and EU in their recent recommendations place external dosimetry audit as a mandatory element in the quality assurance program in radiotherapy [18, 35].

Over the years, the audits have contributed to good dosimetry practice and accuracy of dose measurements in modern radiotherapy. Dosimetry audit ensures, that the correct therapeutic dose is delivered to the patients undergoing radiotherapy and play a key role in activities to create a good *radiation protection* and *safety culture*. One important component of *safety culture*, particularly in the nuclear applications is radiation safety for employees and local communities, while in radiotherapy means safety of the patients and hospital staff. The newest technologies undoubtedly lead to constant trends in the enhancing of the basic principles of *radiation protection* - justification and optimization and to create a good safety culture allowing us to treat more cancer patients in efficient, effective and safely manner.
