Vasculitis & polymyalgia rheumatica
OMERACT giant cell arteritis (GCA) phantom project: validation of a 3D-printed ultrasound training phantom for diagnosis of giant cell arteritis
Authors' conclusion
The study demonstrated high reliability among ultrasound experts in applying the OMERACT ultrasound definitions for GCA and in measuring the IMT using a 3D-printed phantom of the AA and TA.
Study context
- Population
- Ultrasonography experts from 12 European countries examining 3D-printed phantoms of the axillary and superficial temporal arteries
- Participants
- 28 experts12 European countries
- Outcome
- Reliability of ultrasonography findings (normal/vasculitic classification per OMERACT GCA US definitions) and IMT measurements
Methodological detailsblinded examination, predefined protocol, two rounds, 3D-printed phantoms
- Blinded examination
- Predefined protocol
- Two rounds
- 3D-printed phantoms
Main finding
As reported in the abstract
Phantoms correctly classified as normal/abnormal, both rounds
>81%
Interrater Fleiss' kappa, classification, round 1
0.80
95% CI 0.78 to 0.81
Interrater Fleiss' kappa, classification, round 2
0.74
95% CI 0.72 to 0.75
Intima-media thickness (IMT) measurement ICC (1.1), both rounds
0.98
95% CI 0.98 to 0.99
Further findings
Intrarater reliability
- Median Cohen's kappa
- 0.83
- Median ICC
- 0.78
- Described as good
Original publication
OMERACT GCA phantom project: validation of a 3D-printed ultrasound training phantom for diagnosis of giant cell arteritis. RMD Open. Published 6 February 2025. doi:10.
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