Anterior and posterior dual intensity images from bone scintigram are shown.
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Methylene diphosphonate, the agent used for bone scintigraphy, does not cross the placenta. The radiation dose to the fetus comes from transplacental radiation, radiation from the adjacent urinary bladder, and from any free Tc-99m pertechnetate (which does cross the placenta) that may be in the system. The fetus receives about 0.01 Rad/mCi of administered dose. This patient received 21.6 mCi of Tc-99m MDP so the average fetal dose, in this case, was approximately 0.22R. The patient was encouraged to push oral fluids and void frequently to further reduce fetal radiation exposure.
2. The Tc-99m MDP does not cross the placenta. Radiation exposure is transplacental, from the urinary bladder, and from any systemic free Tc-99m pertechnetate.
3. The average fetal dose is approx. 0.01R/mCi administered dose. This exposure may be minimized by hydrating the patient and having her void her bladder frequently.
References and General Discussion of Bone Scintigraphy (Anatomic field:Genitourinary System, Category:Normal, Technique, Congenital Anomaly)
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