scholarly journals Reproducibility of Maxillofacial Anatomic Landmarks on 3-Dimensional Computed Tomographic Images Determined with the 95% Confidence Ellipse Method

2008 ◽  
Vol 78 (3) ◽  
pp. 396-402 ◽  
Author(s):  
Atsushi Muramatsu ◽  
Hiroyuki Nawa ◽  
Momoko Kimura ◽  
Kazuhito Yoshida ◽  
Masahito Maeda ◽  
...  
Keyword(s):  
Ct Images ◽  
Reference Points ◽  
3D Ct ◽  
Confidence Ellipse ◽  
High Reproducibility ◽  
Tomographic Images ◽  
3 Dimensional ◽  
Computed Tomographic ◽  
Ellipse Method ◽  
Characteristic Features

Abstract Objective: To assess the plotting reproducibility of landmarks on 3-dimensional computed tomography (3D-CT) images through use of the 95% confidence ellipse in order to propose sufficiently stable coordinate systems for 3D-CT measurements. Materials and Methods: Six dentists plotted 19 landmarks twice on 3D-CT images. Scatterplots and the 95% ellipses were produced 3-dimensionally, and the areas of the ellipses were calculated for evaluating the reproducibility of landmarks. Results: The plotting reproducibility of each landmark showed characteristic features. Among five landmarks (the sella [S], nasion [N], basion [Ba], orbitale [Or], and true porion [Po]) that are frequently used as reference points on cephalograms, Ba showed the smallest areas for all three coordinate axes, indicating high reproducibility. The coronoid process (CP) and the tooth-related landmarks showed relatively high reproducibility. Conclusion: Sufficiently stable coordinate axes could be proposed for different treatments and studies.

Measurement of tibial torsion

1998 ◽  
Vol 88 (4) ◽  
pp. 160-165 ◽  
Author(s):  
LM Lang ◽  
RG Volpe
Keyword(s):  
Normal Subjects ◽  
Reference Points ◽  
In Vivo Studies ◽  
Tibial Torsion ◽  
Tomographic Images ◽  
Computed Tomographic ◽  
In Vivo Measurement ◽  
Cast Doubt ◽  
Good Agreement

The anatomic accuracy of noninvasive in vivo measurement of tibial torsion was investigated through a comparison of goniometer measurements with those made on computed tomographic images. Seven normal subjects (2 women and 5 men; 14 legs) who ranged in age from 26 to 73 years were studied. The findings indicated that there was good agreement between measurements made by the two methods on the same limb. However, structural inconsistencies were found that cast doubt on the validity of certain anatomic reference points traditionally used in vivo studies of tibial torsion. In particular, use of the tibial tuberosity as a proximal reference may not give a true measurement of tibial or tibiofibular torsion.

scholarly journals Three-dimensional computed tomographic volume rendering imaging as a teaching tool in veterinary radiology instruction

2010 ◽  
Vol 55 (No. 12) ◽  
pp. 603-609 ◽  
Author(s):  
H. Lee ◽  
J. Kim ◽  
Y. Cho ◽  
M. Kim ◽  
N. Kim ◽  
...  
Keyword(s):  
Volume Rendering ◽  
Plain Radiograph ◽  
Three Dimensional ◽  
Ct Images ◽  
3D Ct ◽  
Veterinary Students ◽  
Computed Tomographic ◽  
Group 2 ◽  
Thoracic And Abdominal ◽  
Group 1

The educational value of three-dimensional computed tomography (3D CT) volume rendering imaging was compared to conventional plain radiographic instruction in a veterinary radiology class. Veterinary radiology is an important subject in veterinary medicine and has been well-recognized as a primary diagnostic method. Many junior and senior students have difficulty interpreting two dimensional radiographs that depict three-dimensional organs. A total of 158 junior veterinary students with knowledge of anatomy, pathology, physiology, and other basic subjects were divided into two groups; Group 1 (n = 45) received conventional radiographic instruction using normal and representative abnormal canine thoracic and abdominal radiographs followed by repetition of the same one week later, while Group 2 (n = 113) received plain radiograph instruction as in Group 1 followed by volume-rendered 3D CT images from the same canine patient one week later. The evaluations were performed at the end of each instruction. In Group 1, the majority did not understand the radiographic signs and no significant improvement was observed. In Group 2, 13% and 20% of the students learned only from radiographs, and understood the thoracic and abdominal radiographic alterations, respectively. After studying the 3D CT images, more than 94% of the students deduced the reasons for the radiographic alterations on the radiographs (P < 0.001). These results strongly suggest that 3D CT imaging is an effective tool for teaching radiographic anatomy to veterinary medical students.

RELIABILITY AND VALIDITY STUDY OF A MEASUREMENT METHOD FOR THE GLENOID VERSION BY A 3-DIMENSIONAL BONE MODEL FROM 3.0 TESLA MRI

2016 ◽  
Vol 19 (03) ◽  
pp. 1650012 ◽  
Author(s):  
Yohei Kanno ◽  
Hajime Toda ◽  
Tsutomu Horiuchi ◽  
Katsuaki Nagai ◽  
Masaki Katayose
Keyword(s):  
Intraclass Correlation ◽  
Reliability And Validity ◽  
Ct Images ◽  
Imaging Method ◽  
3D Ct ◽  
3D Mri ◽  
Glenoid Version ◽  
Bone Model ◽  
3 Dimensional ◽  
Ct And Mri

Objective: The authors investigated reliability and validity of 3D-MRI bone model of scapula by comparing the Glenoid versions that were measured each in 3D-CT images and 3D-MRI images. Materials and Methods: The scapula extraction DICOM data of MRI and CT was made to extract only a scapular domain. The scapula bone model was made with the scapula extraction DICOM data of MRI and CT. Glenoid version was measured on the scapula bone model. The mean and standard deviation of the Glenoid version was calculated by each imaging method (CT and MRI). Intraclass reliability of each imaging method (CT and MRI) and agreement between the two methods were evaluated. This was accomplished by calculating two separate measures of agreement: the intraclass correlation coefficient (ICC) and the Bland–Altman analysis. Results: Glenoid version measured from the 3D-CT images averaged [Formula: see text]0.679[Formula: see text][Formula: see text][Formula: see text]3.797, with an ICC of 0.975. Glenoid version measured from the 3D-MRI images averaged [Formula: see text]0.801[Formula: see text][Formula: see text][Formula: see text]3.682, with an ICC of 0.980. Conclusions: 3D-MRI bone model of scapula evaluated the reliability and the validity. 3D-MRI bone model of scapula was found to measure like 3D-CT bone model of scapula.

Three-Dimensional Volumetric Evaluation of the Maxillary Sinuses in Chronic Rhinosinusitis Surgery

2018 ◽  
Vol 127 (12) ◽  
pp. 931-936 ◽  
Author(s):  
Olli Valtonen ◽  
Argyro Bizaki ◽  
Ilkka Kivekäs ◽  
Markus Rautiainen
Keyword(s):  
Chronic Rhinosinusitis ◽  
Operative Treatment ◽  
Measurement Method ◽  
Three Dimensional ◽  
Volumetric Measurement ◽  
Tomographic Images ◽  
3 Dimensional ◽  
Computed Tomographic ◽  
Staging Systems ◽  
Maxillary Sinuses

Introduction: The objective of this study was to ascertain whether the 3-dimensional volumetric measurement method could be used for the evaluation of operative treatment results in patients with chronic rhinosinusitis. Methods: A total of 61 adult patients with chronic rhinosinusitis were analyzed. Cone-beam computed tomographic images of the paranasal sinuses were examined preoperatively and at 12 months postoperatively. The results were compared using the Sino-Nasal Outcome Test (SNOT-22) and the Lund-Mackay (LM) and Zinreich modified staging systems. Results: The mean change in pneumatized volumes in the maxillary sinuses after operative treatment per patient was 2.0 ± 7.5 cm3 ( P = .146). The median for volumetric change was 0.97 cm3 (range, –11.6 to 33.6 cm3). Both the LM and Zinreich modified LM staging systems showed no change in 32 of 61 patients (53%). The alterations in patients’ maxillary sinuses measured using the volumetric measurement method correlated well with changes in Zinreich’s modified LM staging (−0.77, P < .01). Conclusions: The 3D volumetric method is more sensitive in detecting small alterations in pneumatized volumes of the maxillary sinuses than Zinreich’s modified LM staging and LM staging. The method correlates better with Zinreich’s modified LM staging than with LM staging.

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