Reliability and Accuracy of Angular Measurements on Laser Scanning Created 3D Models of Dry Skulls

Abstract

The aim of the study was to assess the accuracy and reliability of skull angles measured on 3D models created by laser scanning. Five skulls were measured through both conventional and digital measuring methods. The 3D models were created using a hand-held laser scanner Creaform VIUscan™. Seven angular characteristics were measured three times by two observers. The intra- and interobserver reliability were assessed using intraclass correlation coefficient. The differences between the digital and direct measurements were assessed using the measurement and relative errors. The intraclass correlation coefficients for digitally taken angles indicated almost perfect intra- and interobserver reliability, except for the alveolar profile angle showing moderate interobserver agreement. The overall measurement error based on the differences between digitally and directly measured angles was 0.61° and the relative error was 0.68%.

Impact of Resolution and Texture of Laser Scanning Generated Three‐Dimensional Models on Landmark Identification

“…In spite of the high variability of the landmarks which constructed it, the deviation of the FH does not exceed 0.5°, which indicates that this plane could be used as a stable landmark‐based reference plane in models obtained with different resolutions. The FH has also been previously reported as sufficiently stable and appropriate for different treatments and studies (Daboul et al, ; Toneva et al, ). Based on the mean MEs and ranks in our study, the most imprecise landmark from those constructing FH is porion (R).…”

Τριδιάστατη Μορφομετρική Ανάλυση Του Σκελετού Του Σύγχρονου Ελληνικού Πληθυσμού Με Φωτογραμμετρικές Τεχνικές

“…According to this study, all measurements exhibited an acceptable measurement error indicating high repeatability and precision, whereas their respective R coefficients demonstrated that all measurements may be regarded as reliable. These findings are in agreement with those reported by Toneva et al (2016). Furthermore, most of the measurements are below the intraand inter-observer %TEM thresholds of 1% and 1.5%, respectively, which are usually considered acceptable for skillful anthropometrists .…”

“…Most often studies on landmark digitization error rely on repetitive measurements over a very small sample for assessing accuracy and repeatability Tallman et al 2014;Toneva et al 2016;Toneva et al 2017). Apart from the intrinsic precision and accuracy of every measuring equipment, landmark digitization error has two fundamental contributors.…”

“…The aforementioned example merely illustrates a common practice of indirect "data sharing" and its implications can be prominent especially in forensic anthropology cases or bioarchaeology, where equipment or other resources may vary between labs or in field work. In order to measure the potential effect of such practices, a number of studies have focused on the precision and accuracy of various equipment especially for producing and measuring digital specimens Barbeito-Andrés et al 2012;Toneva et al 2016;Toneva et al 2017). Other researchers have extended their focus on inter-method error that arises from the use of different equipment and its implications in pooled samples (Sládek et al 2012;Robinson & Terhune 2017;.…”

Computed Tomography versus Optical Scanning: A Comparison of Different Methods of 3D Data Acquisition for Tooth Replication

“…The accuracy of metric characteristics of digitally created 3D reconstructions of anatomical structures has been previously studied. It has been proved that linear and angular measurements of 3D models based on both laser scanning and CT scans are reliable and accurately correspond to the original bones [13, 29–31]. Following these conclusions, it can be believed that an object printed on the base of 3D digital reconstruction should also ideally depict the original.…”