Pinhole versus parallel-hole collimators for parathyroid imaging: an intraindividual comparison

Area of Science:

• Nuclear Medicine
• Radiology
• Endocrinology

Background:

• Preoperative imaging is crucial for diagnosing primary hyperparathyroidism.
• Technetium-99m-sestamibi ([(99m)Tc]Tc-sestamibi) parathyroid imaging is a common diagnostic tool.
• The choice of collimator can influence imaging accuracy.

Purpose of the Study:

• To evaluate the impact of different collimators on the accuracy of preoperative [(99m)Tc]Tc-sestamibi parathyroid imaging.
• To compare the sensitivity and specificity of pinhole versus parallel-hole collimators for detecting parathyroid lesions.

Main Methods:

• Forty-nine patients with primary hyperparathyroidism underwent [(99m)Tc]Tc-sestamibi imaging.
• Imaging protocols included early and late pinhole and parallel-hole views.
• A single nuclear physician interpreted the images, blinded to other results.

Main Results:

• Pinhole imaging demonstrated significantly higher sensitivity (89%) compared to parallel-hole imaging (56%) for all lesions (P = 0.0003).
• Specificity was comparable between pinhole (93%) and parallel-hole (96%) imaging (P = 0.29).
• Pinhole collimators were more sensitive for detecting both single-gland and multigland disease, and for lesions of varying weights.

Conclusions:

• [(99m)Tc]Tc-sestamibi parathyroid imaging of the neck should utilize a pinhole collimator.
• Pinhole collimators enhance diagnostic accuracy, particularly sensitivity, in preoperative parathyroid imaging.
• This improved accuracy can lead to better surgical outcomes for patients with hyperparathyroidism.