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Artifacts in Shear Wave Elastography Images of Thyroid Nodules
Manjiri Dighe1, Daniel S Hippe1, Jeff Thiel1
1Department of Radiology, University of Washington, Seattle, Washington, USA.
Ultrasound in Medicine & Biology
|March 26, 2018
Summary
Artifacts are common in thyroid elastography images, with operator error being the most frequent cause. Recognizing and correcting these artifacts can improve image quality and diagnostic accuracy in shear wave elastography.
Area of Science:
- Radiology
- Medical Imaging
- Ultrasound Technology
Background:
- Thyroid elastography using shear wave elastography (SWE) is a valuable tool for characterizing thyroid nodules.
- Artifacts can compromise the diagnostic accuracy of elastographic images.
- Understanding common artifact types is crucial for improving image interpretation.
Purpose of the Study:
- To evaluate the prevalence and types of artifacts in color elastograms generated by SWE of the thyroid.
- To identify the primary sources of artifacts in thyroid elastography.
- To assess the impact of artifacts on image interpretability.
Main Methods:
- A retrospective review of 1297 thyroid elastography images from 241 nodules in 178 patients.
- Images were acquired using SWE in transverse and longitudinal orientations.
- Artifacts were categorized by type and assessed for their impact on image interpretability.
Main Results:
- Artifacts were present in 69.8% of images, with 18.6% deemed uninterpretable.
- Operator error, primarily due to compression, was the most common artifact source (44.6%).
- Other artifacts stemmed from anatomy (11%), nodule characteristics (17%), and unexplained causes (13%).
Conclusions:
- Artifacts are frequent in thyroid SWE, significantly impacting image quality.
- Operator error is the leading cause of artifacts and is potentially correctable.
- Improved operator training and artifact recognition can enhance the reliability of thyroid elastography.
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