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Quantitative dose-response analysis of salivary function following radiotherapy using sequential RI-sialography
International Journal of Radiation Oncology, Biology, Physics
|September 1, 1985
Summary
Radiation therapy significantly impacts salivary gland function, with parotid glands showing higher sensitivity initially. Salivary gland dysfunction severity correlates with radiation dose and irradiated gland volume.
Area of Science:
- Nuclear Medicine
- Radiology
- Oncology
Background:
- Salivary gland dysfunction is a common side effect of radiation therapy.
- Accurate assessment of salivary gland function is crucial for managing radiation-induced xerostomia.
Purpose of the Study:
- To investigate the radiation effects on salivary gland function using 99mTc-pertechnetate-sialography.
- To establish quantitative dose-response relationships for radiation-induced salivary gland dysfunction.
Main Methods:
- 216 99mTc-pertechnetate-sialographies with citric acid stimulation were performed in 145 patients.
- Time-activity curves were analyzed to assess salivary gland function and classify dysfunction.
- Quantitative dose-response curves were constructed using pre- and post-stimulation count ratios (Rc).
Main Results:
- Citric acid stimulation enhanced isotope accumulation and influenced salivary gland discharge.
- Parotid glands were more sensitive to radiation (0-3 months post-20-70 Gy) than submandibular glands.
- Irradiated gland volume significantly impacted salivary dysfunction; higher doses ( >20 Gy) led to greater impairment.
Conclusions:
- Salivary gland function is significantly impaired by radiation, with varying sensitivity between parotid and submandibular glands.
- Quantitative sialography provides valuable dose-response data for predicting and managing radiation-induced salivary dysfunction.
- Long-term follow-up (3-36 months) reveals progressive impairment of salivary gland uptake with increasing radiation doses.