Journal of Korean Society of Ultrasound in Medicine 2011;30(1): 23-28.
Thyroid Ultrasound: Change of Inter-observer Variability and Diagnostic Performance after Training.
Hee Jung Moon, Eun Kyung Kim, Jeong Seon Park, Jin Young Kwak
1Department of Radiology, Research Institute of Radiological Science, Yonsei University College of Medicine, Korea. docjin@yuhs.ac
2Department of Radiology, Hanyang University Medical Center, Korea.
  Published online: March 1, 2011.
ABSTRACT
PURPOSE: To investigate and compare inter-observer variability and diagnostic performance of thyroid ultrasound (US) between a faculty member and observing residents. MATERIALS AND METHODS: From October 2007 to June 2009, 18 residents underwent training in thyroid US section. Group 1 included 8 residents that were trained for the first time and group 2 included 10 residents that were trained for the second time. US features of nodules were recoded according to the composition, echogenicity, margin, calcifications, shape, and final assessment by a faculty member and residents, respectively. Following a discussion, a faculty member performed fine needle aspiration. Then, the inter-observer variability and diagnostic performance between a faculty member and residents were investigated and compared for US. RESULTS: In group 1, agreement for composition in resident 1, calcification for residents 5 and 6, and shape for resident 4 were slight, moderate, moderate, and moderate, respectively. In group 2, agreement for composition in residents 1 and 10 were moderate. Substantial or greater agreement was observed more frequently in group 2 than 1. The diagnostic performances for both the faculty and residents were high and not statistically different. CONCLUSION: Agreement for US features between a faculty and residents as well as diagnostic performance were high. Moreover, diagnostic performance of residents that underwent training a second time of training was higher than residents that underwent training only once.
Keywords: Thyroid; Ultrasound (US); Thyroid, biopsy; Inter-observer variability
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