Semi-automated Ultrasound Facial Soft Tissue Depth Registration: Method and Validation

    Volume 50, Issue 6 (November 2005)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Published Online: 31 August 2005

    Page Count: 7


    Vandermeulen, D
    University Hospital Gasthuisberg, Leuven,

    Willems, G
    Katholieke Universiteit Leuven, Leuven,

    Loubele, M
    University Hospital Gasthuisberg, Leuven,

    Claes, P
    University Hospital Gasthuisberg, Leuven,

    Suetens, P
    University Hospital Gasthuisberg, Leuven,

    De Greef, S
    Katholieke Universiteit Leuven, Leuven,

    Mollemans, W
    University Hospital Gasthuisberg, Leuven,

    (Received 29 December 2004; accepted 14 May 2005)

    Abstract

    A mobile and fast, semi-automatic ultrasound (US) system was developed for facial soft tissue depth registration. The system consists of an A-Scan ultrasound device connected to a portable PC with interfacing and controlling software. For 52 cephalometric landmarks, the system was tested for repeatability and accuracy by evaluating intra-observer agreement and comparing ultrasound and CT-scan results on 12 subjects planned for craniofacial surgery, respectively. A paired t-test evaluating repeatability of the ultrasound measurements showed 5.7% (n = 3) of the landmarks being significantly different (p < 0.01). US and CT-scan results showed significant differences (p < 0.01) using a Wilcoxon signed rank test analysis for 11.5% (n = 6) of the landmarks. This is attributed to a difference in the volunteer's head position between lying (CT) and sitting (US). Based on these tests, we conclude that the proposed registration system and measurement protocol allows relatively fast (52 landmarks/20 min), non-invasive, repeatable and accurate acquisition of facial soft tissue depth measurements.


    Paper ID: JFS2004547

    DOI: 10.1520/JFS2004547

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    Author
    Title Semi-automated Ultrasound Facial Soft Tissue Depth Registration: Method and Validation
    Symposium , 0000-00-00
    Committee E30