scholarly journals Three dimensional CT analysis of the change in rotational alignment in double level osteotomy after double level osteotomy performed for varus osteoarthritic knees

2021 ◽  
Vol 25 ◽  
pp. 16-21
Author(s):  
Shunichiro Kambara ◽  
Hiroshi Nakayama ◽  
Ryo Kanto ◽  
Shintaro Oonishi ◽  
Makoto Kanto ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Rotational Alignment ◽  
Ct Analysis

Micro-CT analysis of two-dimensional and three-dimensional parameters in severely curved roots prepared with 3 instrumentation systems: An in vitro study

2020 ◽  
Vol 9 (2) ◽  
pp. 62
Author(s):  
AntonioMiranda da Cruz-Filho ◽  
LuisEduardo Souza-Flamini ◽  
BrunoMonguilhott Crozeta ◽  
RicardoGariba Silva ◽  
RicardoNovak Savioli ◽  
...  
Keyword(s):  
Three Dimensional ◽  
In Vitro Study ◽  
Vitro Study ◽  
Two Dimensional ◽  
Micro Ct ◽  
Ct Analysis ◽  
Dimensional Parameters

scholarly journals Method of Individual Adjustment for 3D CT Analysis: Linear Measurement

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Dong Kyu Kim ◽  
Dong Hun Choi ◽  
Jeong Woo Lee ◽  
Jung Dug Yang ◽  
Ho Yun Chung ◽  
...  
Keyword(s):  
Age Groups ◽  
Three Dimensional ◽  
Linear Measurement ◽  
3D Analysis ◽  
3D Ct ◽  
Ct Reconstruction ◽  
The Real ◽  
Bone Surgery ◽  
Ct Analysis ◽  
Picture Archiving And Communication

Introduction. We aim to regularize measurement values in three-dimensional (3D) computed tomography (CT) reconstructed images for higher-precision 3D analysis, focusing on length-based 3D cephalometric examinations.Methods. We measure the linear distances between points on different skull models using Vernier calipers (real values). We use 10 differently tilted CT scans for 3D CT reconstruction of the models and measure the same linear distances from the picture archiving and communication system (PACS). In both cases, each measurement is performed three times by three doctors, yielding nine measurements. The real values are compared with the PACS values. Each PACS measurement is revised based on the display field of view (DFOV) values and compared with the real values.Results. The real values and the PACS measurement changes according to tilt value have no significant correlations (p>0.05). However, significant correlations appear between the real values and DFOV-adjusted PACS measurements (p<0.001). Hence, we obtain a correlation expression that can yield real physical values from PACS measurements. The DFOV value intervals for various age groups are also verified.Conclusion. Precise confirmation of individual preoperative length and precise analysis of postoperative improvements through 3D analysis is possible, which is helpful for facial-bone-surgery symmetry correction.

Three-dimensional CT analysis of vomer bone in the architecture of craniofacial structures in caucasic human skulls

2009 ◽  
Vol 2 (4) ◽  
pp. 191-204 ◽  
Author(s):  
Cristian Basili ◽  
Takero Otsuka ◽  
Mitsuyoshi Kubota ◽  
Rudolf Slavicek ◽  
Sadao Sato
Keyword(s):  
Three Dimensional ◽  
Ct Analysis ◽  
Human Skulls

scholarly journals Computer-based three-dimensional measurement of carpal alignment: measurement techniques and normal ranges

2021 ◽  
pp. 175319342110396
Author(s):  
Robert M. J. Sippo ◽  
Theresa E. K. Höglund ◽  
Eero Waris
Keyword(s):  
Measurement Techniques ◽  
Intraclass Correlation ◽  
Three Dimensional ◽  
Reference Database ◽  
Mean Values ◽  
Observer Reliability ◽  
Normal Ranges ◽  
Asymptomatic Volunteers ◽  
Ct Analysis ◽  
Computer Based

The three-dimensional carpal alignment was measured in the neutral wrist position in 121 asymptomatic volunteers using computer-based cone-beam CT analysis. Normal values and the reliability of the automated analysis are reported. An analysis software based on segmentation of CT images and mathematical modelling was used to determine several axis variants based on different landmarks and to calculate the intercarpal angles automatically. Twenty wrists were imaged twice to determine intra-observer reliability. Mean values using the preferred axis variants were: scapholunate angle 57° (SD 9°), radiolunate angle 2° (SD 10°), lunocapitate angle –14° (SD 9°). Using alternate axis variants notably changed the angles produced. The intra-observer reliability of the analysis was excellent (mean intraclass correlation coefficient 0.97, SD 0.03). Computer-based CT analysis enables highly reproducible and automated assessment of carpal alignment. This study provides a reference database for measurement techniques and normal carpal angle values in three-dimensional imaging.

scholarly journals X-ray CT Analysis of the Cross-Section of a 3D-Printed Deformed Layer

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7764
Author(s):  
Ho-Jae Lee ◽  
Eun-A Seo ◽  
Won-Woo Kim ◽  
Jun-Mo Yang ◽  
Jae-Heum Moon
Keyword(s):  
Three Dimensional ◽  
Travel Speed ◽  
Cross Sectional Area ◽  
Sectional Area ◽  
Cross Sectional ◽  
X Ray ◽  
Deformed Layer ◽  
Ct Analysis ◽  
3D Printed ◽  
The Cross

In this study, we experimentally analyzed the deformation shape of stacked layers developed using three-dimensional (3D) printing technology. The nozzle traveling speed was changed to 80, 90, 100, and 110 mm/s when printing the layers to analyze its effect on layer deformation. Furthermore, the cross-sectional area and the number of layers were analyzed by printing five layers with overall dimensions of 1000 (w) × 2200 (l) × 50 (h) mm (each layer was 10 mm high) using Vernier calipers. Moreover, we analyzed the interface and cross-sectional area of layers that are difficult to confirm visually using X-ray computed tomography (X-ray CT) analysis. As a result of measuring the deformation at the center of the layer, it was confirmed that the deformation was greater for lower nozzle traveling speeds. Consequently, the X-ray CT analysis verified that the layer had the same cross-sectional area irrespective of the layer printing order at the same nozzle travel speed, even if the layer was deformed.

Three-dimensional CT analysis of atlantoaxial rotation: results in the normal subject

1994 ◽  
Vol 16 (2) ◽  
pp. 199-204 ◽  
Author(s):  
J-L Dumas ◽  
P Thoreux ◽  
P Attali ◽  
D Goldlust ◽  
JP Chevrel
Keyword(s):  
Three Dimensional ◽  
Normal Subject ◽  
Ct Analysis
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