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Related Experiment Videos

Thyroid imaging with iodine-125 and technetium-99m.

J R Prince, S M Zu'bi, B L Haag

    European Journal of Nuclear Medicine
    |February 1, 1979
    PubMed
    Summary

    This study found that Iodine-125 (125I) thyroid scans were consistently preferred over Technetium-99m (99mTc) scans. Despite potential procedural benefits of 99mTc, image quality favored 125I across all patient categories.

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    Area of Science:

    • Nuclear Medicine
    • Radiology
    • Endocrinology

    Background:

    • Thyroid imaging is crucial for diagnosing various thyroid conditions.
    • Radioiodine uptake (RAIU) measurements are standard for classifying thyroid function.
    • Comparative studies of different radioisotopes for thyroid scanning are ongoing.

    Purpose of the Study:

    • To compare the diagnostic image quality of Iodine-125 (125I) and Technetium-99m (99mTc) for thyroid imaging.
    • To evaluate the performance of these radioisotopes across different thyroidal classifications.

    Main Methods:

    • Eighty-eight patients underwent thyroid imaging using both 125I and 99mTc with a rectilinear scanner.
    • Two experienced physicians independently evaluated and ranked the paired scans (1-5 scale).
    • Statistical analysis included the sign test and transformed normal score methods.

    Main Results:

    • In all analyzed categories (hypothyroid, euthyroid, hyperthyroid, nodules, Graves' disease, etc.), 125I scans were not rated as worse than 99mTc scans.
    • Physicians consistently preferred 125I scans over 99mTc scans for image quality.
    • This preference was observed regardless of the specific thyroid condition being evaluated.

    Conclusions:

    • Iodine-125 (125I) demonstrates superior image quality compared to Technetium-99m (99mTc) in thyroid imaging.
    • Despite 99mTc's potential procedural advantages and lower radiation dose, 125I remains the preferred isotope for diagnostic accuracy in thyroid scans.
    • Findings contrast with some previous studies, highlighting the importance of direct comparative image quality assessments.

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