Keratoconus Diagnosis by Patient-Specific 3D Modelling and Geometric Parameters Analysis

2017 ◽  
pp. 176-187
Author(s):  
Laurent Bataille ◽  
Francisco Cavas-Martínez ◽  
Daniel G. Fernández-Pacheco ◽  
Francisco J. F. Cañavate ◽  
Jorge L. Alio
Keyword(s):  
3D Modelling ◽  
Geometric Parameters ◽  
Patient Specific ◽  
Parameters Analysis

scholarly journals 3D MODELLING AND RAPID PROTOTYPING FOR CARDIOVASCULAR SURGICAL PLANNING – TWO CASE STUDIES

2016 ◽  
Vol XLI-B5 ◽  
pp. 887-893 ◽  
Author(s):  
E. Nocerino ◽  
F. Remondino ◽  
F. Uccheddu ◽  
M. Gallo ◽  
G. Gerosa
Keyword(s):  
3D Printing ◽  
Rapid Prototyping ◽  
Case Studies ◽  
Surgical Planning ◽  
Heart Diseases ◽  
Coronary Vessels ◽  
3D Modelling ◽  
Patient Specific ◽  
Surface Model ◽  
Medical Imagery

In the last years, cardiovascular diagnosis, surgical planning and intervention have taken advantages from 3D modelling and rapid prototyping techniques. The starting data for the whole process is represented by medical imagery, in particular, but not exclusively, computed tomography (CT) or multi-slice CT (MCT) and magnetic resonance imaging (MRI). On the medical imagery, regions of interest, i.e. heart chambers, valves, aorta, coronary vessels, etc., are segmented and converted into 3D models, which can be finally converted in physical replicas through 3D printing procedure. In this work, an overview on modern approaches for automatic and semiautomatic segmentation of medical imagery for 3D surface model generation is provided. The issue of accuracy check of surface models is also addressed, together with the critical aspects of converting digital models into physical replicas through 3D printing techniques. A patient-specific 3D modelling and printing procedure (Figure 1), for surgical planning in case of complex heart diseases was developed. The procedure was applied to two case studies, for which MCT scans of the chest are available. In the article, a detailed description on the implemented patient-specific modelling procedure is provided, along with a general discussion on the potentiality and future developments of personalized 3D modelling and printing for surgical planning and surgeons practice.

To study the contribution of different geometric parameters on the failure load for multi holes pin joints prepared from glass/epoxy nanoclay laminates

2017 ◽  
Vol 52 (5) ◽  
pp. 629-644 ◽  
Author(s):  
Manjeet Singh ◽  
JS Saini ◽  
H Bhunia
Keyword(s):  
Taguchi Method ◽  
Failure Modes ◽  
Failure Load ◽  
Characteristic Curve ◽  
Free Edge ◽  
Failure Criteria ◽  
Geometric Parameters ◽  
Unidirectional Glass ◽  
Curve Method ◽  
Parameters Analysis

The present work aims to analyze the strength and failure modes for the multi holes pin joint configurations made from unidirectional glass/epoxy nanoclay laminates. The geometric parameters, i.e. the distance from the free edge of the specimen to the diameter of the first two holes (E/D) ratio, the distance between two holes along the length of the specimen to the diameter of the hole (F/D) ratio, the distance between the two holes along the width of the specimen to the diameter of the hole (P/D) ratio and side width to diameter (S/D) ratio were studied for their effect on strength and failure modes of the joint. Design of experiment with Taguchi method was used for the optimization of different geometric parameters. Analysis of variance was applied to determine the influence of individual geometric parameter on the strength of the joint. The results demonstrate that the E/D and F/D ratios are the most significant parameters to increase the strength of multi holes pin joint configurations. Their percentage contributions were about 62% to 65% and 23% to 26%, respectively. Thereafter, the characteristic curve method along with Tsai–Wu failure criteria was applied to compare the numerical and experimental predictions.

scholarly journals 3D MODELLING AND RAPID PROTOTYPING FOR CARDIOVASCULAR SURGICAL PLANNING – TWO CASE STUDIES

2016 ◽  
Vol XLI-B5 ◽  
pp. 887-893 ◽  
Author(s):  
E. Nocerino ◽  
F. Remondino ◽  
F. Uccheddu ◽  
M. Gallo ◽  
G. Gerosa
Keyword(s):  
3D Printing ◽  
Rapid Prototyping ◽  
Case Studies ◽  
Surgical Planning ◽  
Heart Diseases ◽  
Coronary Vessels ◽  
3D Modelling ◽  
Patient Specific ◽  
Surface Model ◽  
Medical Imagery

In the last years, cardiovascular diagnosis, surgical planning and intervention have taken advantages from 3D modelling and rapid prototyping techniques. The starting data for the whole process is represented by medical imagery, in particular, but not exclusively, computed tomography (CT) or multi-slice CT (MCT) and magnetic resonance imaging (MRI). On the medical imagery, regions of interest, i.e. heart chambers, valves, aorta, coronary vessels, etc., are segmented and converted into 3D models, which can be finally converted in physical replicas through 3D printing procedure. In this work, an overview on modern approaches for automatic and semiautomatic segmentation of medical imagery for 3D surface model generation is provided. The issue of accuracy check of surface models is also addressed, together with the critical aspects of converting digital models into physical replicas through 3D printing techniques. A patient-specific 3D modelling and printing procedure (Figure 1), for surgical planning in case of complex heart diseases was developed. The procedure was applied to two case studies, for which MCT scans of the chest are available. In the article, a detailed description on the implemented patient-specific modelling procedure is provided, along with a general discussion on the potentiality and future developments of personalized 3D modelling and printing for surgical planning and surgeons practice.

3D modelling and printing of craniofacial implant template

2019 ◽  
Vol 25 (2) ◽  
pp. 397-403 ◽  
Author(s):  
Deepkamal Kaur Gill ◽  
Kartikeya Walia ◽  
Aditi Rawat ◽  
Divya Bajaj ◽  
Vipin Kumar Gupta ◽  
...  
Keyword(s):  
Bone Cement ◽  
Computer Aided Design ◽  
3D Modelling ◽  
Patient Specific ◽  
3D Design ◽  
Time Saving ◽  
Content Type ◽  
Cranial Defect ◽  
Computer Aided ◽  
Cad Cam

Purpose To relieve intracranial pressure and save patient inflicted with severe head injury, neurosurgeons restore cranial defects. These defects can be caused because of trauma or diseases (Osteomyelitis of bone) which are treated by cranioplasty, using the preserved bone of patient. In case of non-availability of bone, a cranial implant is generated using a biocompatible synthetic material, but this process is less accurate and time-consuming. Hence, this paper aims to present the use of rapid prototyping technology that allows the development of a more accurate patient-specific template and saves the surgery time. Design/methodology/approach A five-year-old girl patient having cranial defect was taken up for cranioplasty. CT (computed tomography) scans of the patient were used to generate 3D design of the implant suitable to conceal the defect on the left frontal portion using CAD/CAM (computer-aided design/ computer-aided manufacturing) software. The design was used for 3D printing to manufacture a base template, which was finally used to fabricate the actual implant using Simplex® P bone cement material to conceal the defect. Findings Surgery using Simplex® P implant was performed successfully on the patient, giving precise natural curvature to left frontal portion of the patient, decreasing surgery time by about 30 per cent. Originality/value The case demonstrates the development of a convenient, time-saving and aesthetically superior digital procedure to treat cranial defect in the absence of preserved bone flap using CT scan as input. 3D modelling and printing were deployed to produce an accurate template which was used to generate an implant using bone cement biocompatible material.

Parameters Analysis with Regard to the Hollow Floor Based on the ABAQUS Secondary Development

2012 ◽  
Vol 446-449 ◽  
pp. 1337-1342
Author(s):  
Chuan Teng Huang ◽  
Zhi Jun Wang ◽  
Yang Yi Qu
Keyword(s):  
Construction Cost ◽  
Geometric Parameters ◽  
Single Parameter ◽  
Parameter Analysis ◽  
Secondary Development ◽  
Modeling Analysis ◽  
Excellent Mechanical Property ◽  
Parameters Analysis ◽  
The Impact ◽  
Statistical Analysis Software

Nowadays, the hollow floor is widely used due to its excellent mechanical property and economic benefit. However, its related specification is absence of evaluation in geometric parameters; furthermore, the research on the geometric parameters is seldom involved. This thesis has achieved automatic modeling, analysis and data processing concerning the hollow floor by python script. Based on ABAQUS secondary development and the statistical analysis software SPSS, single parameter analysis and the partial correlation between the parameters and the construction cost are carried out in this thesis. According to a number of case studies, the impact of every single parameter on the construction cost and the correlation of geometric parameters with construction cost were achieved. The above mentioned conclusions will be conducive to engineering design and further research in this field.

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