The document discusses a parathyroid scan, which is used to localize hyperfunctioning parathyroid tissue, such as adenomas or hyperplasia. It involves injecting the patient intravenously with technetium-99m sestamibi or tetrofosmin and taking images of the neck and mediastinum at 15-20 minutes and 2 hours later. The scan is contraindicated in pregnant women or those on calcium or thyroid medication. It requires a gamma camera and involves positioning the patient supine with their neck extended for anterior and optional oblique views.

1. parathyroid scan
by:Zahera Alhajji

2. Introduction
•-There are four parathyroid glands located alongside
and sometimes within the thyroid gland.
•-There are usually two parathyroid glands near the left
lobe of the thyroid and two near the right lobe.
•-They are small, oval-shaped glands each approximately
6 mm and weighing approximately 30–50 mg.

3. Indication
•Localization of primary and secondary parathyroid
cancer
•Localization of hyperfunctioning parathyroid tissue
(adenoma/ hyperplasia).
•Localization of hyperfunctioning parathyroid tissue in
patients with persistent or recurrent disease

4. Contraindication
•-Pregnant women
•-patient on calcium medication
•- patient on thyroid medication (off for 5 days)
•Precaution
•Precaution: Discontinuation of breast feeding for
nursing mothers for 24 hours after imaging.

5. Radiopharmaceutical
•99mTechnetium(sestamibi-tetrofosmin) adult: 15 mCi
•99mTechnetium-pertechnetate adult: 5-12 mCi
•Child: As per body weight
•Technique of administration
•Intravenous Injection

6. Examination Time
• Initial injection and images at 15-20 min
• Delayed images at 2 hours .

7. EQUIPMENT
CAMERA
Small or Large field of view
COLLIMATOR
(pinhole or low energy all purpose or low energy high
Resolution )
.

8. Patient position& Imaging field
• Patient position: Supine.
• Imaging field: Neck and mediastinum

9. PROCEDURE
• Prepare the camera and Place patient in supine
position, pillow under shoulders, head back, neck
extended.
• • Position camera anterior over extended neck and
mediastinum.
• Remove any attenuating necklaces or pendants.
• • Instruct patient to remain motionless during
acquisitions.

10. • Acquire ANT dynamic images.
• Oblique views may be requested by the physician
• Repeat all images at approximately 2hours after
injection. Use the same camera, and as close as
possible to the original patient positions and
collimator positions.