Outer Canthus Indicator를 이용한 두부 자세 기록법의 재현성
Reproducibility and reliability of head posture obtained by the outer canthus indicator
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두부방사선 사진 채득 시 발생가능한 두부의 수직회전은 계측점 선정 및 계측치의 재현성에 영향을 줄 수 있으므로 진단자료의 객관화 및 중첩의 용이성을 위해 두부 회전을 최소화해야 한다. 본 연구에서는 연조직 계측점인 외안각(outer canthus)을 지표로 두부 자세를 기록하고 재현하는 방법의 신뢰도를 평가하고자 하였다. 정상 안모의 성인 남녀 21명에서 두부고정기에 부착한 Outer Canthus Indicator (OCI)를 이용하여 벽면응시를 통한 두부자세에서의 외안각의 위치를 계측하였다. 초진 시 두부자세에서 측모 광학 사진을 촬영하고 이틀 후 같은 계측치로 두부자세를 재현하여 얻은 두 장의 사진을 중첩하여 두부의 수직 회전과 외이도의 변위를 측정하였다. 두 명의 술자가 동일 과정을 반복했을 때 두부의 수직 회전은 각각 평균 0.69 ± 0.43o, 0.98 ± 0.65o, 표준오차 0.09, 0.14로 나타났다. 외이도의 수평변위는 각각 평균 0.90 ± 0.72 mm, 0.72 ± 0.55 mm, 표준오차 0.16, 0.12이고 외이도의 수직변위는 평균 0.81 ± 0.68 mm, 1.17 ± 0.67 mm, 표준오차 0.15, 0.15이었다. 술자간 신뢰도를 평가하기 위한 paired t-test에서 변수들간 통계적으로 유의한 차이가 발견되지 않았다. Pearson 상관분석에서 외이도의 수평 변위와 수직 변위 사이에 통계적으로 유의성 있는 상관관계는 나타나지 않았다. 이상의 결과에 따라 OCI가 두부의 수직 회전에 의한 오차를 줄임으로써 규격화되고 상호 중첩 가능한 방사선 사진 및 광학 사진 자료를 채득하는 데 도움을 줄 것으로 사료된다. (대치교정지 2010;40(2):77-86)
Abstract
Objective: The purposes of this study were to evaluate the reproducibility and reliability of head posture obtained by registering outer canthus as a soft tissue landmark with the Outer Canthus Indicator (OCI). Methods: Twenty-one adults with normal facial morphology were enrolled in this study (mean age 27.5 ± 1.72 years). To register initial head posture, height of the outer canthus from the ear rod plane was measured using OCI. Head posture was reproduced by moving the head upwards and downwards until the outer canthus was in a straight line with the indicator set at a registered height. After the head posture is reproduced by two operators after two days, lateral photographs were taken. Computerized photometric analyses of the photographs were performed. Results: The head rotations around the transverse axis were 0.69 ± 0.43o, 0.98 ± 0.65o from each of the two operators. Standard errors were 0.09° and 0.14° each, which were similar to results from past research findings. There were no significant differences between the data from the two operators (p ＞ 0.05). There were no correlations between the head rotation around the horizontal and vertical axes (p ＞ 0.05). Conclusions: The present study suggests that OCI-registered head posture may minimize errors from vertical head rotation in cephalometry and photometry. (Korean J Orthod 2010;40(2):77-86)
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