Flaw Shape Characterization in 3D Volume Visualization in Ultrasonic Testing

2006 ◽  
Author(s):  
Vaclav Matz ◽  
Radislav Smid ◽  
Marcel Kreidl ◽  
Jiri Kerka
Keyword(s):  
Ultrasonic Testing ◽  
Volume Visualization ◽  
3D Volume ◽  
Shape Characterization ◽  
Flaw Shape

scholarly journals A Clustering-Based Automatic Transfer Function Design for Volume Visualization

2016 ◽  
Vol 2016 ◽  
pp. 1-13 ◽  
Author(s):  
Tianjin Zhang ◽  
Zongrui Yi ◽  
Jinta Zheng ◽  
Dong C. Liu ◽  
Wai-Mai Pang ◽  
...  
Keyword(s):  
Clustering Algorithm ◽  
Spatial Information ◽  
Transfer Functions ◽  
Clustering Algorithms ◽  
Volume Visualization ◽  
Automatic Generation ◽  
Volume Data ◽  
3D Volume ◽  
Ap Clustering ◽  
Different Tissues

The two-dimensional transfer functions (TFs) designed based on intensity-gradient magnitude (IGM) histogram are effective tools for the visualization and exploration of 3D volume data. However, traditional design methods usually depend on multiple times of trial-and-error. We propose a novel method for the automatic generation of transfer functions by performing the affinity propagation (AP) clustering algorithm on the IGM histogram. Compared with previous clustering algorithms that were employed in volume visualization, the AP clustering algorithm has much faster convergence speed and can achieve more accurate clustering results. In order to obtain meaningful clustering results, we introduce two similarity measurements: IGM similarity and spatial similarity. These two similarity measurements can effectively bring the voxels of the same tissue together and differentiate the voxels of different tissues so that the generated TFs can assign different optical properties to different tissues. Before performing the clustering algorithm on the IGM histogram, we propose to remove noisy voxels based on the spatial information of voxels. Our method does not require users to input the number of clusters, and the classification and visualization process is automatic and efficient. Experiments on various datasets demonstrate the effectiveness of the proposed method.

3D Volume Visualization and Screen-based Interaction with Dynamic Ray Casting on Autostereoscopic Display

2021 ◽  
Author(s):  
Ruiyang Li ◽  
Tianqi Huang ◽  
Hanying Liang ◽  
Boxuan Han ◽  
Xinran Zhang ◽  
...  
Keyword(s):  
Volume Visualization ◽  
Ray Casting ◽  
Autostereoscopic Display ◽  
3D Volume

VOLUME VISUALIZATION FOR SURGICAL PLANNING SYSTEM

2007 ◽  
Vol 07 (01) ◽  
pp. 55-63 ◽  
Author(s):  
CHAN CHEE FATT ◽  
IRWAN KASSIM ◽  
CHARLES LO ◽  
IVAN NG ◽  
KWOH CHEE KEONG
Keyword(s):  
Computer Technology ◽  
Surgical Approach ◽  
Surgical Planning ◽  
Volume Visualization ◽  
Planning System ◽  
Neurosurgical Planning ◽  
2D Imaging ◽  
3D Volume ◽  
Volume Models

The 3D volume visualization is to overcome the difficulties of the 2D imaging by using computer technology. A volume visualization approach has been successfully implemented for Surgical Planning System in National Neuroscience Institute (NNI). The system allows surgeons to plan a surgical approach on a set of 2D image slices and process into volume models and visualise them in 3D rapidly and interactively on PC. In our implementation, we have applied it in neurosurgical planning. The surgeon can visualize objects of interest like tumor and surgical path, and verify that the surgical plan avoids the critical features and the planning of the surgical path can thus be optimal.

Applying Ultrasonic Testing to Detect Hole Defect Near the Surface

2011 ◽  
Vol 194-196 ◽  
pp. 2054-2057 ◽  
Author(s):  
Ming Kuen Chang ◽  
Hua Sui Sun ◽  
Jyun Cang Ciou
Keyword(s):  
Ultrasonic Testing ◽  
Delay Line ◽  
Medium Carbon Steel ◽  
Structural Safety ◽  
Near Surface ◽  
Straight Beam ◽  
Hole Defect ◽  
Wire Cutting ◽  
The Relationship ◽  
Flaw Shape

During materials manufacturing process will cause defects occasionally, if the defects located at near surface of material where the testing is not easy to implement. When the defects was stress by outside loading, it will grow up even become fracture, if the material apply ultrasonic testing then can increase material security to ensure structural safety. Practice material defect shape is variable and need complex product procedure. In this study, using wire cutting method to make practice defects specimen instead of the real flaws material, the specimen was made of medium carbon steel and aluminum alloy, defects away from the surface is 2-4 mm, defect shape including round shape hole and square shape hole, bore diameter was 1-3 mm. Using ultrasonic straight beam probe and delay line probe, straight beam probe have 5 MHz and 10 MHz frequency, and delay line probe have 5 MHz, 10 MHz frequency too, finally, compared the relationship between the accuracy and depth of flaws, pore size, flaw shape, material of specimen. Research results demonstrate that accuracy didn’t relate to the flaw shape, flaw size, depth of flaws and material of specimen. The accurately of 10 MHz delayed probe shown the depth of flaw smaller, the measurement than other probes.

Visualizing the Time Motion of Planar Mechanisms With Volume Methods

2005 ◽  
Author(s):  
Mike Bailley
Keyword(s):  
Volume Visualization ◽  
Spatial Dimension ◽  
Three Dimensions ◽  
Time Dimension ◽  
Modeling And Analysis ◽  
Planar Mechanism ◽  
Time Motion ◽  
Novel Approach ◽  
3D Volume ◽  
Visualization Techniques

Two dimensional, or planar, mechanism design is a mainstay of Mechanical Engineering modeling and analysis. An important part of the design process is the visualizing of the motion of the mechanism. This paper describes a novel approach to visualizing the time motion of a planar mechanism — turning the time dimension into a spatial dimension. All three dimensions (x,y,time) are then treated as a 3D volume. From there, we use interactive volume visualization techniques, including slicing and thresholding. As is seen, this method is able to produce new insights into planar mechanism motion, particularly when more than one mechanism is working cooperatively.

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