Identification of the Position and Thickness of the First Annular Pulley in Sonographic Images

Tai Hua Yang, Yi Hsun Lin, Bo I. Chuang, Hsin Chen Chen, Wei Jr Lin, Dee Shan Yang, Shyh Hau Wang, Yung Nien Sun, I. Ming Jou, Li Chieh Kuo, Fong Chin Su

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The purpose was to identify the A1 pulley's exact location and thickness by comparing measurements from a clinical high-frequency ultrasound scanner system (CHUS), a customized high-frequency ultrasound imaging research system (HURS) and a digital caliper. Ten cadaveric hands were used. We explored the pulley by layers, inserted guide pins and scanned it with the CHUS. After identifying the pulley, we measured each long finger's thickness using the CHUS and excised the pulley to measure its thickness with a digital caliper and the HURS. The thin hypo-echoic layer was revealed to be the synovial fluid space, and the pulley appears hyper-echoic regardless of scan direction. We also defined the pulley's boundaries. Moreover, the CHUS provided a significantly lower measurement of the pulley's thickness than the digital caliper and HURS. Likewise, based on the digital caliper's measurement, the HURS had significantly lower mean absolute and relative errors than the CHUS.

Original languageEnglish
Pages (from-to)1075-1083
Number of pages9
JournalUltrasound in Medicine and Biology
Issue number5
Publication statusPublished - 2016 May 1

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Radiological and Ultrasound Technology
  • Acoustics and Ultrasonics


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