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Ultrasound elastography for thyroid nodules: a reliable study?

Jae Kyun Kim¹, Jung Hwan Baek, Jeong Hyun Lee

¹Department of Radiology, Chung-Ang University College of Medicine, Seoul, Korea.

Ultrasound in Medicine & Biology

|July 7, 2012

Summary

Ultrasound elastography (USE) showed moderate reliability for solid thyroid nodules. Factors like rim calcification and technical aspects significantly impact USE reliability, suggesting careful application.

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Area of Science:

Radiology
Medical Imaging
Endocrinology

Background:

Ultrasound elastography (USE) is an emerging technique for evaluating thyroid nodules.
Assessing the reliability and influencing factors of USE is crucial for its clinical adoption.

Purpose of the Study:

To determine the reliability of ultrasound elastography (USE) in assessing solid thyroid nodules.
To identify factors associated with the reliability of USE.
To evaluate interobserver and intraobserver agreement for USE.

Main Methods:

Conventional ultrasound and USE were performed on 106 solid thyroid nodules in 78 patients.
Reliability was assessed using predefined criteria, including color distribution, score consistency, and signal loss.
Multivariable logistic regression analyzed factors affecting reliability; interobserver and intraobserver agreement were calculated using kappa statistics.

Main Results:

The consensual reliability of USE was 68% for the evaluated thyroid nodules.
Rim calcification, compressive force (≥3), and arterial pulsation were significantly associated with USE reliability.
Substantial interobserver (κ=0.738) and intraobserver (κ=0.765) agreement were found for reliable USE results.

Conclusions:

Ultrasound elastography demonstrates moderate reliability in assessing solid thyroid nodules.
Clinical application of USE should be limited to nodules with reliable USE results, considering identified influencing factors.
Further standardization may improve the consistency and applicability of USE in thyroid nodule evaluation.