According to the subject characteristics of radiation oncology, three teaching practices were carried out in the teaching of standardized residency training: teaching situation transformation under the guidance of constructivism theory, expanding teaching with points to areas, and organ system-centered medical classroom under the guidance of case analysis. At the same time, it combines the guidance of the residents' active exploration, integrated thinking and cooperative learning. Through the modulation of teaching and learning practices guided by constructivism, the residents' learning and understanding of radiation oncology knowledge and the integration and construction ability of "organ system-centered" medical knowledge are promoted, their active learning potential and innovative thinking ability are stimulated, and finally the teaching quality of this specialty is improved.

Objective To explore the feasibility of reduction by using cone beam computed tomography (CBCT) before intensity modulated radiation therapy(IMRT) in the patients with nasopharyngeal carcinoma.Methods Twenty-three patients with nasopharyngeal carcinoma (NPC) undergoing IMRT were included in this study.The reverse IMRT plan with CBCT verification was prepared with location center coordinates origin as the planned central point.Before therapy,the CBCT reduction was adopted,the CBCT scanning was performed before the second and third radiotherapies.The registering data in 3 times were analyzed and summarized.Results In CBCT reduction,the absolute value at any direction≤3 mm accounted for 89.9％ (62/69),＜5 mm accounted for 98.6 ％ (68/69),and the deviation value at every direction was (0.6 ± 2.1)mm;in the second and third CBCT,the absolute value at any direction ≤3 mm accounted for 92.8％ (128 q38),＜5 mm accounted for 99.3％ (137/138),and the deviation value at every direction was (0.4 ± 2.0) mm:the difference between the two sets of data had no statistically significant difference (P＞ 0.05).Conclusion In formulating the nasopharyngeal carcinoma IMRT plan withthe location center coordinates origin as the planned central point,adopting the CBCT reduction is intuitional,convenient,practicable and feasible.

Radiotherapy is the most common treatment for nasopharyngeal carcinoma, and the radiotherapy technique is essential for the prognosis of nasopharyngeal carcinoma. Due to the complexity of the structure of the intensity-modulated device and the accuracy of the clinical requirements of radiotherapy, it is inevitable that higher requirements will be imposed on the process of intensity-modulated radiotherapy. Currently, gaps exist in the radiotherapy equipment and personnel qualification among radiotherapy units, and thus the homogenization in the radiotherapy remains to be strengthened in China. With the application of radiotherapy information management system, digital medicine and artificial intelligence technologies in the field of radiotherapy, the original process fails to meet the application needs of the new precise radiotherapy technology. Therefore, this process is designed based on the existing radiotherapy procedures for nasopharyngeal carcinoma in combination with the latest developments in the field of radiotherapy, aiming to establish a novel standard process recommendation, ensuring the standardization and homogenization of radiotherapy and achieve the individualized intensity-modulated radiotherapy for nasopharyngeal carcinoma patients.