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Parathyroid imaging using simultaneous double-window recording of technetium-99m-sestamibi and iodine-123
E Hindié1, D Mellière, C Jeanguillaume
1Department of Nuclear Medicine, Henri Mondor University Hospital, Créteil, France.
Summary
Technetium-99m-sestamibi/iodine-123 subtraction scanning accurately locates parathyroid neoplasms. This optimized method offers higher sensitivity and is faster than single-tracer techniques for parathyroid imaging.
Area of Science:
- Nuclear Medicine
- Radiopharmacology
- Endocrine Surgery
Background:
- Technetium-99m-sestamibi (99mTc-sestamibi) is a key radiotracer for scintigraphic localization of parathyroid neoplasms.
- Optimal protocols for 99mTc-sestamibi parathyroid scanning require further definition.
Purpose of the Study:
- To optimize technical aspects of subtraction scanning using simultaneous double-window recording of 99mTc-sestamibi and iodine-123 (123I).
- To compare subtraction scanning with single-tracer double-phase scanning for detecting abnormal parathyroid glands.
Main Methods:
- Thirty patients with primary hyperparathyroidism underwent both subtraction and double-phase scanning.
- Simultaneous recording of 99mTc-sestamibi and 123I images followed by subtraction.
- Visual comparison of 99mTc-sestamibi images acquired at 15 and 120 minutes for double-phase scanning.
Main Results:
- Subtraction scanning achieved 94% sensitivity for enlarged parathyroids with a 3% false-positive rate.
- Single-tracer scanning had 79% sensitivity and a 10% false-positive rate.
- Subtraction imaging was faster (30 min vs. 50 min) and more sensitive (p < 0.04).
Conclusions:
- 99mTc-sestamibi/123I subtraction imaging is an accurate method for locating enlarged parathyroids.
- Simultaneous isotope recording overcomes limitations like motion artifacts.
- Subtraction imaging is superior to single-tracer techniques in speed and sensitivity.