Nuclear Medicine Imaging
In Radionuclide thyroid imaging, the patient gets radioactive iodine either by oral (I 123 or I 131) or IV injection of 99mTc pertechnetate. This investigation is very helpful in accurate diagnosis of hyperthyroidism. In bone scan, radioactive technetium diphosphate is introduced by IV injection followed by imaging the skeleton by scanning camera, hot spots are often detectable before an X-Ray can reveal any lesions. For liver/ spleen scan, radioactive trace of choice is technetium Sulfide - 99 m, which gets concentrated in the reticuloendothelial cells through phagocytosis. For renal scan, the tracer 99mTc-DTPA is administered by IV route & rapid sequence photographs are taken. HIDA scan is hepatobiliary scanning through injection of IDAs (Iminodiacetic acid analogues) labeled with technetium-99m. Gallium scanning is a whole body scan to assess certain neoplasm or inflammatory lesions which attract gallium citrate (67 Ga).For cardiovascular imaging, thallium scan or gated pool imaging, MUGA (multiple gated acquisition) study, technetium pyrophosphate scanningand persantine - thallium imaging are done.
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