IMRT Images Based on Swarm Intelligence Algorithm in the Treatment of Nasopharyngeal Carcinoma and Pain

Objective. To investigate the IMRT treatment of nasopharyngeal carcinoma term effect, toxicity, and technical features. Methods. Sliding windows dynamic CT image-guided IMRT techniques on 31 patients for treatment of nasopharyngeal carcinoma radical radiotherapy, with 30 to 33 min irradiation. Target prescription dose GTVnx, GTVnd, CTV1, and CTV2 were 70∼76Gy, 68∼70Gy, 60∼66Gy, and 54Gy, while giving a dose of vital organs, the brain stem, and other restrictions to protect the parotid gland. Results. During 3 to 18 months of follow-up for a median period of 10 months, 1-year locoregional patients’ progression-free survival, distant metastasis-free survival, and overall survival rates were 93.5%, 87.1%, and 93.5%, respectively. Acute radiation reactions of grade I and II, xerostomia, and radioactive stomatitis were not observed. IMRT DVH analysis showed increased total dose and the irradiation target volume divided doses, reduced OARs illuminated, and the total dose divided doses. Conclusion. Intensity-modulated radiation therapy can achieve good short-term effects, significantly reduce the acute radiation response, and improve the quality of life of patients. It is worthy of promotion and application and in-depth research.