Validation of an experimental low-cost projection moiré profilometer for 3D surface imaging of anatomical models of the middle third of the face

TY - CHAP

T1 - Validation of an experimental low-cost projection moiré profilometer for 3D surface imaging of anatomical models of the middle third of the face

AU - Artopoulos, Andreas

AU - Coward, Trevor J.

AU - Dirckx, Joris J J

AU - Buytaert, J. A N

PY - 2013/12/1

Y1 - 2013/12/1

N2 - Three dimensional (3D) surface imaging is a valuable tool in maxillofacial rehabilitation and prosthodontics research and clinical practice. Laser scanning and digital stereophotogrammetry devices have been validated and widely used for this purpose, but there is a lack of evidence on the accuracy of 3D imaging of the face using projection moiré profilometry. The aim of this chapter is to investigate the accuracy of an experimental low-cost projection moiré profilometer for 3D imaging of anatomical models of the middle third of the face. The experimental profilometer was directly compared in a pilot study with a 3D contacting scanner for imaging the edentulous maxilla, as reproduced on the fitting surfaces of denture bases. 3D surface data acquired with moiré profilometry were comparable to the results achieved with contact scanning, and could be used for qualitative and quantitative analysis of shape and deformation. In the main study 22 3D surface models of the middle third of the face derived from computed tomography (CT) scans were used to fabricate photopolymer models by rapid prototyping, and these were digitized using the experimental profilometer. The 3D surface models acquired were compared for shape differences with the original CT models using surface matching software. Global registration between each pair of corresponding models was carried out using an iterative closest point algorithm. The distributions of measured surface differences were used to calculate L-moments. Mean measurement error (L1 moments) was 0.14mm, with standard deviation 0.03mm, 95% confidence intervals 0.15mm - 0.12mm, and range from 0.06mm to 0.21mm. These results were in agreement with previous studies which validated widely used commercial 3D laser scanning and digital stereophotogrammetry devices. The experimental projection moiré profilometer employed could be further assessed in an in vivo study.

AB - Three dimensional (3D) surface imaging is a valuable tool in maxillofacial rehabilitation and prosthodontics research and clinical practice. Laser scanning and digital stereophotogrammetry devices have been validated and widely used for this purpose, but there is a lack of evidence on the accuracy of 3D imaging of the face using projection moiré profilometry. The aim of this chapter is to investigate the accuracy of an experimental low-cost projection moiré profilometer for 3D imaging of anatomical models of the middle third of the face. The experimental profilometer was directly compared in a pilot study with a 3D contacting scanner for imaging the edentulous maxilla, as reproduced on the fitting surfaces of denture bases. 3D surface data acquired with moiré profilometry were comparable to the results achieved with contact scanning, and could be used for qualitative and quantitative analysis of shape and deformation. In the main study 22 3D surface models of the middle third of the face derived from computed tomography (CT) scans were used to fabricate photopolymer models by rapid prototyping, and these were digitized using the experimental profilometer. The 3D surface models acquired were compared for shape differences with the original CT models using surface matching software. Global registration between each pair of corresponding models was carried out using an iterative closest point algorithm. The distributions of measured surface differences were used to calculate L-moments. Mean measurement error (L1 moments) was 0.14mm, with standard deviation 0.03mm, 95% confidence intervals 0.15mm - 0.12mm, and range from 0.06mm to 0.21mm. These results were in agreement with previous studies which validated widely used commercial 3D laser scanning and digital stereophotogrammetry devices. The experimental projection moiré profilometer employed could be further assessed in an in vivo study.

KW - 3D surface imaging

KW - Face scanner

KW - Maxillofacial imaging

KW - Moiré profilometry

UR - http://www.scopus.com/inward/record.url?scp=84895260470&partnerID=8YFLogxK

M3 - Chapter

AN - SCOPUS:84895260470

SN - 9781626188402

SP - 129

EP - 178

BT - Recent Advances in Topography Research

A2 - Buytaert, Jan

PB - Nova Science Publishers Inc

ER -