Image Distortion Compensation by Using a Polynomial Model in an X-Ray Digital Tomosynthesis System

2005 ◽  
Vol 297-300 ◽  
pp. 2034-2039 ◽  
Author(s):  
J.Y. Kim ◽  
J.S. Yoon
Keyword(s):  
Flip Chip ◽  
Image Intensifier ◽  
Industrial Applications ◽  
Image Distortion ◽  
Polynomial Model ◽  
Digital Tomosynthesis ◽  
Cross Sectional ◽  
Distortion Compensation ◽  
X Ray ◽  
Cross Sectional Imaging

X-ray technology has been widely used in a number of industrial applications for monitoring and inspecting inner defects which can hardly be found by normal vision systems as a ball grid array (BGA) or a flip chip array (FCA). Digital tomosynthesis (DT) is one of the most useful X-ray cross-sectional imaging methods for PCB inspection, and it usually uses an X-ray image intensifier. However, the image intensifier distorts X-ray images severely both of shape and intensity. This distortion breaks the correspondences between those images and prevents us from acquiring accurate cross-section images. Therefore, image distortion compensation is one of the most important issues in realizing a DT system. In this paper, an image distortion compensation method for an X-ray DT system is presented. It is to use a general distortion polynomial model on two dimensional plane that can cope with arbitrary, complex and various forms of distortion. Experimental results show a great improvement in compensation speed and accuracy.

scholarly journals Cross-sectional imaging of the torso reveals occult injuries in asymptomatic blunt trauma patients

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Gregory J. Roberts ◽  
Lewis E. Jacobson ◽  
Michelle M. Amaral ◽  
Courtney D. Jensen ◽  
Louis Cooke ◽  
...  
Keyword(s):  
Blunt Trauma ◽  
Chest Ct ◽  
Physical Exam ◽  
Trauma Patients ◽  
Cross Sectional ◽  
X Ray ◽  
Cross Sectional Imaging ◽  
Normal Chest ◽  
Chest X Ray ◽  
Sectional Imaging

Abstract Background High morbidity and mortality rates of trauma injuries make early detection and correct diagnosis crucial for increasing patient’s survival and quality of life after an injury. Improvements in technology have facilitated the rapid detection of injuries, especially with the use of computed tomography (CT). However, the increased use of CT imaging is not universally advocated for. Some advocate for the use of selective CT imaging, especially in cases where the severity of the injury is low. The purpose of this study is to review the CT indications, findings, and complications in patients with low Injury Severity Scores (ISS) to determine the utility of torso CT in this patient cohort. Methods A retrospective review of non-intubated, adult blunt trauma patients with an initial GCS of 14 or 15 evaluated in an ACS verified level 1 trauma center from July 2012 to June 2015 was performed. Data was obtained from the hospital’s trauma registry and chart review, with the following data included: age, sex, injury type, ISS, physical exam findings, all injuries recorded, injuries detected by torso CT, missed injuries, and complications. The statistical tests conducted in the analysis of the collected data were chi-squared, Fischer exact test, and ANOVA analysis. Results There were 2306 patients included in this study, with a mean ISS of 8. For patients with a normal chest exam that had a chest CT, 15% were found to have an occult chest injury. In patients with a negative chest exam and negative chest X-ray, 35% had occult injuries detected on chest CT. For patients with a negative abdominal exam and CT abdomen and pelvis, 16% were found to have an occult injury on CT. Lastly, 25% of patients with normal chest, abdomen, and pelvis exams with chest, abdomen, and pelvis CT scans demonstrated occult injuries. Asymptomatic patients with a negative CT had a length of stay 1 day less than patients without a corresponding CT. No incidents of contrast-induced complications were recorded. Conclusions A negative physical exam combined with a normal chest X-ray does not rule out the presence of occult injuries and the need for torso imaging. In blunt trauma patients with normal sensorium, physical exam and chest X-ray, the practice of obtaining cross-sectional imaging appears beneficial by increasing the accuracy of total injury burden and decreasing the length of stay.

Direct cross-sectional imaging using X-ray Compton scattering: application to commercial batteries

2021 ◽  
Vol 28 (4) ◽  
Author(s):  
Naruki Tsuji ◽  
Kentaro Kajiwara ◽  
Masayoshi Itou ◽  
Yoshiharu Sakurai
Keyword(s):  
Compton Scattering ◽  
Three Dimensional ◽  
Regions Of Interest ◽  
Cross Sectional ◽  
X Ray ◽  
Dimensional Image ◽  
Sample Rotation ◽  
Direct Cross ◽  
Cross Sectional Imaging ◽  
Sectional Imaging

A synchrotron-based technique using Compton scattering imaging is presented. This technique has been applied to a coin battery (CR2023), and the cross-sectional image has been obtained in 34 ms without sample rotation. A three-dimensional image of the whole structure has been reconstructed from 74 cross-sectional images taken consecutively by scanning the incident, wide X-ray beam along one direction. This work demonstrates that quick cross-sectional imaging of regions of interest and three-dimensional image reconstruction without sample rotation are feasible using Compton scattering imaging.

An X-ray Photoelectron Spectroscopie Study of B-N-Ti system

1997 ◽  
Vol 472 ◽  
Author(s):  
Sudipta Seal ◽  
Tery L. Barr ◽  
Natalie Sobczak ◽  
Ewa Benko ◽  
J. Morgiel
Keyword(s):  
Photoelectron Spectroscopy ◽  
Industrial Applications ◽  
General Interest ◽  
X Ray Diffraction ◽  
Cross Sectional ◽  
X Ray ◽  
Transmission Electron ◽  
Wear And Corrosion ◽  
Interfacial Growth ◽  
Wear And Corrosion Resistance

ABSTRACTComposite nitrides (such as BN, TiN) are widely used in various industrial applications because of their extreme wear and corrosion resistance, thermal and electrical properties. In order to obtain composite materials with mese optimal properties, it is important to elucidate whether any chemical reactions occur at nitride/metal interfaces, e.g., those involving BN-Ti/TiN. Materials of interest include the deposition by PVD of Ti and TiN on BN substrates. Some of these systems were then subjected to varying degrees of physical and thermal alteration. Detailed X-ray photoelectron spectroscopy (XPS) has merefore been rendered of these interfaces using cross-sectional display and sputter etching. Resulting structural and morphological features have been investigated with transmission electron microscopy (TEM) and X-ray diffraction (XRD). Diffusion of the nitridation, oxynitride formation and interfacial growth are of general interest.

Imaging and Strain Analysis of Threading-Edge and Basal-Plane Dislocations in 4H-SiC Using X-Ray Three-Dimensional Topography

2012 ◽  
Vol 725 ◽  
pp. 3-6 ◽  
Author(s):  
Ryohei Tanuma ◽  
Daisuke Mori ◽  
Isaho Kamata ◽  
Hidekazu Tsuchida
Keyword(s):  
Basal Plane ◽  
Three Dimensional ◽  
Strain Analysis ◽  
Cross Sectional ◽  
X Ray ◽  
Substrate Interface ◽  
Cross Sectional Imaging ◽  
Simulation Results ◽  
Sectional Imaging ◽  
Edge Dislocations

This paper demonstrates the X-ray three-dimensional topography of basal-plane dislocations (BPDs) and threading edge dislocations (TEDs) in 4H-SiC. Cross-sectional imaging shows the propagation of BPDs from a substrate to an epilayer and the conversion of BPDs into TEDs near the epilayer/substrate interface. The strain analysis of TEDs exhibits the image of strains in the order of ±10-5. The observed strain images correlate well to simulation results.

scholarly journals Choose wisely: imaging for diagnosis of axial spondyloarthritis

2021 ◽  
pp. annrheumdis-2021-220136
Author(s):  
Torsten Diekhoff ◽  
Iris Eshed ◽  
Felix Radny ◽  
Katharina Ziegeler ◽  
Fabian Proft ◽  
...  
Keyword(s):  
Diagnostic Accuracy ◽  
Axial Spondyloarthritis ◽  
Lower Sensitivity ◽  
Reference Standard ◽  
Sacroiliac Joints ◽  
Cross Sectional ◽  
Rater Reliability ◽  
X Ray ◽  
Cross Sectional Imaging ◽  
Ct And Mri

ObjectiveTo assess the diagnostic accuracy of radiography (X-ray, XR), CT and MRI of the sacroiliac joints for diagnosis of axial spondyloarthritis (axSpA).Methods163 patients (89 with axSpA; 74 with degenerative conditions) underwent XR, CT and MR. Three blinded experts categorised the imaging findings into axSpA, other diseases or normal in five separate reading rounds (XR, CT, MR, XR +MR, CT +MR). The clinical diagnosis served as reference standard. Sensitivity and specificity for axSpA and inter-rater reliability were compared.ResultsXR showed lower sensitivity (66.3%) than MR (82.0%) and CT (76.4%) and also an inferior specificity of 67.6% vs 86.5% (MR) and 97.3% (CT). XR +MR was similar to MR alone (sensitivity 77.5 %/specificity 87.8%) while CT+MR was superior (75.3 %/97.3%). CT had the best inter-rater reliability (kappa=0.875), followed by MR (0.665) and XR (0.517). XR +MR was similar (0.662) and CT+MR (0.732) superior to MR alone.ConclusionsXR had inferior diagnostic accuracy and inter-rater reliability compared with cross-sectional imaging. MR alone was similar in diagnostic performance to XR+MR. CT had the best accuracy, strengthening the importance of structural lesions for the differential diagnosis in axSpA.

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