Recording natural head position using an accelerometer and reconstruction from computed tomographic images
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Objectives: The concept of natural head position (NHP) was first introduced by Broca in 1862, and was described as a person’s stable physiologic po-sition “when a man is standing and his visual axis is horizontal.” NHP has been used routinely for clinical examination; however, a patient’s head posi-tion is random during cone-beam computed tomography (CBCT) acquisition. To solve this problem, we developed an accelerometer to record patients’ NHP and reproduce them for CBCT images. In this study, we also tested the accuracy and reproducibility of our accelerometer. Materials and Methods: A total of 15 subjects participated in this study. We invented an accelerometer that measured acceleration on three axes and that could record roll and pitch calculations. Recorded roll and pitch data for each NHP were applied to a reoriented virtual image using three-dimen-sional (3D) imaging software. The data between the 3D models and the clinical photos were statistically analyzed side by side. Paired t-tests were used to statistically analyze the measurements. Results: The average difference in the angles between the clinical photograph and the 3D model was 0.04o for roll and 0.29o for pitch. The paired t-tests for the roll data (P=0.781) and the pitch data (P=0.169) showed no significant difference between the clinical photographs and the 3D model (P>0.05).Conclusion: By overcoming the limitations of previous NHP-recording techniques, our new method can accurately record patient NHP in a time-efficient manner. Our method can also accurately transfer the NHP to a 3D virtual model.
Abstract
Objectives: The concept of natural head position (NHP) was first introduced by Broca in 1862, and was described as a person’s stable physiologic po-sition “when a man is standing and his visual axis is horizontal.” NHP has been used routinely for clinical examination; however, a patient’s head posi-tion is random during cone-beam computed tomography (CBCT) acquisition. To solve this problem, we developed an accelerometer to record patients’ NHP and reproduce them for CBCT images. In this study, we also tested the accuracy and reproducibility of our accelerometer. Materials and Methods: A total of 15 subjects participated in this study. We invented an accelerometer that measured acceleration on three axes and that could record roll and pitch calculations. Recorded roll and pitch data for each NHP were applied to a reoriented virtual image using three-dimen-sional (3D) imaging software. The data between the 3D models and the clinical photos were statistically analyzed side by side. Paired t-tests were used to statistically analyze the measurements. Results: The average difference in the angles between the clinical photograph and the 3D model was 0.04o for roll and 0.29o for pitch. The paired t-tests for the roll data (P=0.781) and the pitch data (P=0.169) showed no significant difference between the clinical photographs and the 3D model (P>0.05).Conclusion: By overcoming the limitations of previous NHP-recording techniques, our new method can accurately record patient NHP in a time-efficient manner. Our method can also accurately transfer the NHP to a 3D virtual model.
참고문헌 (28)
- "Bull Soc Anthropol Paris", 1862, 514~544
- Moorrees CFA, "Natural head position, a basic consideration in the interpretation of cephalometric radiographs", Am J Phys Anthropol, 16, pp.213~234 (1958)
- Weber DW, "Three-dimensional reproducibility of natural head position", Am J Orthod Dentofacial Orthop, 143, pp.738~744 (2013)
- Huggare JA, "Nasorespiratory function and head posture", Am J Orthod Dentofacial Orthop, 112, pp.507~511 (1997)
- Lundström A, "Natural head position", a discussion of concepts, 1990, pp.17, 249~250
- Weber ZJ, "Resistance to nasal airflow related to changes in head posture", Am J Orthod, 80, pp.536~545 (1981)
- AlKofide EA, "The association between posture of the head and malocclusion in Saudi subjects", Cranio, 25, pp.98~105 (2007)
- Barbera AL, "Variation in natural head position and establishing corrected head position", Homo, 65, pp.187~200 (2014)
- Andrighetto AR, "Effects of neuromuscular deprogramming on the head position", Cranio, 33, pp.183~188 (2015)
- Vig PS, "Experimental manipulation of head posture", Am J Orthod, 77, pp.258~268 (1980)
- Liu XJ, "Modified method of recording and reproducing natural head position with a multicamera system and a laser level", Am J Orthod Dentofacial Orthop, 147, pp.781~787 (2015)
- Schatz EC, "Development of a technique for recording and transferring natural head position in 3 dimensions", J Craniofac Surg, 21, pp.1452~1455 (2010)
- Lin XP, "Longitudinal study of the stability and reproducibility of natural head position in adolescents with different facial types over time", Shanghai Kou Qiang Yi Xue, 14, pp.238~242 (2005)
- Dubojska AM, "Natural head position and growth of the facial part of the skull", Cranio, 31, pp.109~117 (2013)
- Showfety KJ, "A simple method for taking natural-head-position cephalograms", Am J Orthod, 83, pp.495~500 (1983)
- Viazis AD, "A cephalometric analysis based on natural head position", J Clin Orthod, 25, pp.172~181 (1991)
- Leitão P, "Relationship of natural head position to craniofacial morphology", Am J Orthod Dentofacial Orthop, 117, pp.406~417 (2000)
- Robertson C, "Cranial base considerations between apnoeics and non-apnoeic snorers, and associated effects of long-term mandibular advancement on condylar and natural head position", Eur J Orthod, 24, pp.353~361 (2002)
- Uşümez S, "Reproducibility of natural head position measured with an inclinometer", Am J Orthod Dentofacial Orthop, 123, pp.451~454 (2003)
- Cevidanes L, "Head orientation in CBCT-generated cephalograms", Angle Orthod, 79, pp.971~977 (2009)
- Arnett GW, "Facial planning for orthodontists and oral surgeons", Am J Orthod Dentofacial Orthop, 126, pp.290~295 (2004)
- Uşümez S, "Inclinometer method for recording and transferring natural head position in cephalometrics", Am J Orthod Dentofacial Orthop, 120, pp.664~670 (2001)
- Tian K, "Reproducibility of natural head position in normal Chinese people", Am J Orthod Dentofacial Orthop, 148, pp.503~510 (2015)
- Swennen GR, "A new method of 3-D cephalometry Part I: the anatomic Cartesian 3-D reference system", J Craniofac Surg, 17, pp.314~325 (2006)
- Xia JJ, "A new method to orient 3-dimensional computed tomography models to the natural head position: a clinical feasibility study", J Oral Maxillofac Surg, 69, pp.584~591 (2011)
- Damstra J, "Simple technique to achieve a natural position of the head for cone beam computed tomography", Br J Oral Maxillofac Surg, 48, pp.236~238 (2010)
- Chen CM, "Simple technique to achieve a natural head position for cephalography", Br J Oral Maxillofac Surg, 46, pp.677~678 (2008)
- Lundström F, "Natural head position as a basis for cephalometric analysis", Am J Orthod Dentofacial Orthop, 101, pp.244~247 (1992)