Simplified Assessment of Radioiodine Biokinetics for Thyroid Cancer Patients: A Practical Approach Using Continuous...

Area of Science:

• Nuclear Medicine
• Radiopharmacology
• Thyroid Cancer Management

Background:

• Radioiodine (RAI) biokinetics in thyroid cancer patients present complex challenges.
• Accurate assessment is crucial for safe patient discharge and minimizing caregiver radiation exposure.

Purpose of the Study:

• To develop a practical method for assessing RAI biokinetics.
• To predict patient discharge time and estimate radiation exposure to caregivers.

Main Methods:

• Retrospective review of differentiated thyroid carcinoma patients undergoing RAI treatment.
• Dynamic collection of serial radiation dose rates during hospitalization.
• Biexponential model fitting to determine RAI uptake fraction and effective half-life, correlating with TcUR, RR, renal function, and BMI.

Main Results:

• Thirty-five patients were analyzed.
• Derived RAI uptake fraction was 0.08 ± 0.06 and effective half-life was 7.57 ± 1.45 h.
• Significant correlations were found between RAI uptake fraction and TcUR/RR, and between effective half-life and renal function/BMI.

Conclusions:

• A novel, practical method for assessing RAI biokinetics was developed and validated.
• The method shows reliability and potential for predicting discharge times and caregiver radiation exposure.
• This approach supports radiation protection strategies, adhering to the ALARA principle.