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Radiotherapy efficacy of E-Flow imaging on cervical lymph nodes metastasized from nasopharyngeal carcinoma
1Department of Radiology, Xiangya Hospital, Central South University, Changsha 410008, China.
Objective:
To explore the effect of E-Flow imaging on the radiotherapy of cervical lymph nodes metastasized from nasopharyngeal carcinoma.
Methods:
A total of 52 nasopharyngeal carcinoma patients with 94 invasion neck lymph nodes were treated with conventional radiotherapy. Lymph node size, hemodynamic parameters, and blood supply were detected by E-Flow imaging and two-dimensional ultrasound before and after the radiotherapy. The relationship between those examinations and radiotherapy effect was analyzed.
Results:
Of the 94 metastatic cervical lymph nodes from nasopharyngeal carcinoma before the radiotherapy, 40 disappeared, 52 reduced, and 2 maintained the original size after the radiotherapy. Blood flow in all residual lymph nodes decreased or disappeared. Artery flow spectrum in the lymph node was changed from the high-speed high impedance to low-speed low resistance. The size of cervical lymph node and blood flow before the radiotherapy were associated with clinical efficacy (P < 0.05).
Conclusion:
E-Flow imaging plays an important role in assessing the efficacy of radiation therapy by changing the blood supply of cervical lymph node and its size before and after the radiotherapy.