QUALITATIVE AND QUANTITATIVE THYROID IMAGING IN FELINE HYPERTHYROIDISM USING TECHNETIUM-99M AS PERTECHNETATE |
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| Authors: | Carmel T Mooney MVB MPhil Keith L Thoday BVetMed Phd DVD Jeremy J Nicoll BSc Phd David L Doxey BVM&S PhdD |
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| Institution: | University of Edinburgh, Department of Veterinary Clinical Studies, Royal (Dick) School of Veterinary Studies, Summerhall, Edinburgh EH9 1QH, Scotland, U.K.;Department of Medical Physics and Medical Engineering, Royal Infirmary of Edinburgh, I, Lauriston Place, Edinburgh EH3 9YW, Scotland, U.K. |
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| Abstract: | Thyroid imaging using technetium-99m as pertechnetate (99mTcO4) was carried out in five healthy, euthyroid and 37 hyperthyroid cats using both pinhole and parallel-hole collimators. Images of greater resolution, necessary to distinguish bilateral lobe involvement, were obtained using the pinhole collimator. Per cent thyriod 99mTcO4 - uptake was calculated in each cat and was significanly (P < 0.001) higher in hyperthyroid compared with euthyroid cats. In the hyperthyroid cats, per cent thyroid uptake was significantly correlated with serum total thyroxine (T4) and triiodothyronine (T3) Concentrations. Per cent thyroid 99mTcO4 - uptake is increased in feline hyperthyrodism and may be calculated using a pinhole collimator alone at the time of qalitative assessment of the extent of thyroid tissue involvement. |
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| Keywords: | feline thyroid hyperthyroidism thyroid imaging 99TcO4 - per cent thyroid 99mTcO4 -uptake |
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