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Using a computerized method to measure 99mTc pertechnetate uptake for the assessment of thyroid function: a clinical
1Department of Nuclear Medicine, Chang-Gung Memorial Hospital, Taipei, R.O.C.
Summary
This study shows that technetium-99m pertechnetate uptake ratio is an accurate method for evaluating thyroid function. This method is faster and involves less radiation exposure than traditional iodine-131 uptake measurements.
Area of Science:
- Nuclear Medicine
- Endocrinology
Background:
- Thyroid function tests are crucial for diagnosing thyroid disorders.
- Traditional iodine-131 uptake measurements require significant patient time and involve higher radiation exposure.
Purpose of the Study:
- To evaluate the accuracy and precision of the 99mTc pertechnetate uptake ratio for assessing thyroid function.
- To determine if this method can be used as a reliable alternative to 131I uptake measurements.
Main Methods:
- Retrospective analysis of 187 patients' thyroid function data.
- Utilized computer software for 99mTc pertechnetate uptake ratio measurement.
- Compared 99mTc pertechnetate uptake with radioimmunoassay of thyroid hormones and 24-hour 131I thyroid uptake.
Main Results:
- The mean 99mTc pertechnetate uptake ratio in euthyroid patients was 2.77 +/- 1.77%.
- A strong correlation (0.71) was found between 99mTc pertechnetate and 24-hour 131I uptakes.
- The method achieved high diagnostic accuracy (95.6%) in distinguishing hyperthyroidism from euthyroidism.
Conclusions:
- 99mTc pertechnetate uptake ratio is a precise and accurate index for thyroid function evaluation.
- This method offers reduced patient time, cost, and radiation exposure compared to 131I uptake.
- Thyroid function can be assessed concurrently with routine 99mTc pertechnetate thyroid scans.