Clinical Presentation

A 3-year-old child is admitted to the hospital with rectal bleeding.

Fig. 146.1 Ten minute images.

Technique

• Cimetidine (20 mg/kg) is administered orally for 24 to 48 hours before the study.

• The patient is fasting for 4 hours before the radiopharmaceutical is injected.

• The patient should void before the study. Catheterization may be required.

• ^99mTc-pertechnetate (0.1 mCi/kg) is administered intravenously.

• Sequential 5-minute images are acquired for 1 hour.

• Upright and oblique static images can be obtained as necessary to confirm localization or differentiate gastrointestinal activity from urinary tract activity.

Image Interpretation