Cone-beam volumetric CT imagers: simulations for rapid prototype system design and prediciton of image quality

2001 ◽  
Author(s):  
Deborah J. Walter ◽  
Baorui Ren ◽  
Armin H. Pfoh ◽  
Peter M. Edic ◽  
Xiaoye Wu ◽  
...  
Keyword(s):  
Image Quality ◽  
System Design ◽  
Rapid Prototype ◽  
Cone Beam ◽  
Prototype System ◽  
Volumetric Ct ◽  
Rapid Prototype System

Life Cycle Performance Estimation and In-Flight Health Monitoring for Gas Turbine Engine

2016 ◽  
Vol 138 (9) ◽  
Author(s):  
Feng Lu ◽  
Wenhua Zheng ◽  
Jinquan Huang ◽  
Min Feng
Keyword(s):  
Life Cycle ◽  
Anomaly Detection ◽  
Gas Turbine ◽  
Rapid Prototype ◽  
Gas Turbine Engine ◽  
Performance Estimation ◽  
Prototype System ◽  
Turbine Engine ◽  
Abnormal Detection ◽  
Rapid Prototype System

A long-term gas-path fault diagnosis and its rapid prototype system are presented for on-line monitoring of a gas turbine engine. Toward this end, a nonlinear hybrid model-based performance estimation and abnormal detection method are proposed in this paper. An adaptive extended Kalman particle filter (AEKPF) estimator is developed and used to real time estimate engine health parameters, which depict gas turbine performance degradation condition. The health parameter estimators are then pushed into a buffer memory and for periodical renewing baseline model (BM) performance, and the BM is utilized to detect engine anomaly over its life course. The threshold in abnormal detection schemes is adapted to the modeling errors during the engine lifetime. The rapid prototyping system is designed and built up based on the National Instrument (NI) CompactRIO (CRIO) for evaluating gas turbine engine performance estimation and anomaly detection. A number of experiments are carried out to demonstrate the advantages of the proposed abnormal detection scheme and effectiveness of the designed rapid prototype system to the problem of gas turbine life cycle anomaly detection.

scholarly journals An Image Quality Comparison Study Between Homemade and Commercial Dental Cone-Beam CT Systems

2021 ◽  
Author(s):  
Trang Thi Ngoc Tran ◽  
David Shih-Chun Jin ◽  
Kun-Long Shih ◽  
Ming-Lun Hsu ◽  
Jyh-Cheng Chen
Keyword(s):  
Image Quality ◽  
Spatial Resolution ◽  
Image Distortion ◽  
Cone Beam ◽  
Prototype System ◽  
Micro Ct ◽  
Mineral Density ◽  
Image Intensity ◽  
System A ◽  
Noise Ratio

Abstract Purpose Cone-beam computed tomography (CBCT) has been widely applied in dental and maxillofacial imaging. Several dental CBCT systems have been recently developed in order to improve the performance. This study aimed to evaluate the image quality of our prototype (YMU-DENT-P001) and compare with a commercial POYE Expert 3DS dental CBCT system (system A). Methods The Micro-CT Contrast Scale, Micro-CT Water and Micro-CT HA phantoms were used to evaluate the two CBCT systems in terms of contrast-to-noise ratio (CNR), signal-to-noise ratio (SNR), uniformity (U), distortion, and linearity in the relationship between image intensity and calcium hydroxyapatite concentration. We also fabricated a proprietary thin-wire phantom to evaluate full width at half maximum (FWHM) spatial resolution. Both CBCT systems used the same exposure protocol, and data analysis was performed in accordance with ISO standards using a proprietary image analysis platform. Results The SNR of our prototype system was nearly five times higher than that of system A (prototype: 159.85 ± 3.88; A: 35.42 ± 0.61; p < 0.05) and the CNR was three times higher (prototype: 329.39 ± 5.55; A: 100.29 ± 2.31; p < 0.05). The spatial resolution of the prototype (0.2446 mm) greatly exceeded that of system A (0.5179 mm) and image distortion was lower (prototype: 0.03 mm; system A: 0.285 mm). Little difference was observed between the two systems in terms of the linear relationship between bone mineral density (BMD) and image intensity. Conclusions Within the scope of this study, our prototype YMU-DENT-P001 outperformed system A in terms of spatial resolution, SNR, CNR, and image distortion.

scholarly journals AN ULTRA HIGH BANDWIDTH AUTOMOTIVE RAPID PROTOTYPE SYSTEM

2007 ◽  
Vol 40 (10) ◽  
pp. 547-554 ◽  
Author(s):  
Carl Wilhelmsson ◽  
Per Tunestal ◽  
Bengt Johansson
Keyword(s):  
Rapid Prototype ◽  
Prototype System ◽  
High Bandwidth ◽  
Rapid Prototype System

scholarly journals A technical note on intra-arterial cone-beam computed tomography for the evaluation of flow-diverter stents: Image quality differences between diluted and non-diluted contrast medium

2019 ◽  
Vol 26 (2) ◽  
pp. 164-169
Author(s):  
Naci Kocer ◽  
Sedat G Kandemirli ◽  
Daniel Ruijters ◽  
Michalis Mantatzis ◽  
Osman Kizilkilic ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Image Quality ◽  
Contrast Medium ◽  
Cone Beam Computed Tomography ◽  
Vessel Wall ◽  
Flow Diverter ◽  
Cone Beam ◽  
Gray Scale ◽  
Stent Deployment ◽  
Contrast Technique

Background Design of flow-diverter stents for flexibility, tractability, and low profile limits their radiopacity on conventional digital subtraction angiography. Cone-beam computed tomography (CBCT) offers higher spatial resolution for the evaluation of flow-diverter stents. However, CBCT requires optimal dilution and timing of contrast medium for simultaneous visualization of the stent, arterial lumen, and vessel wall. There are only limited data on the effects of different contrast dilutions on CBCT image quality in neurointerventional applications. Materials and methods In our institution, intra-arterial CBCTs were acquired during stent deployment and at follow-ups with 10% diluted contrast. We had recently started acquiring intra-arterial CBCTs with non-diluted contrast. Retrospective analysis of our flow-diverter data identified eight cases with different aneurysm locations who had intra-arterial CBCT with 10% diluted contrast immediately after flow-diverter stent deployment and with non-diluted contrast technique during follow-ups. For each case, the image quality between diluted and non-diluted contrast techniques was compared qualitatively by assessing stent visualization and quantitatively by plotting gray-scale intensity values along the vessel lumen. Results In two sets of CBCT images per each case, there was no substantial difference between diluted and non-diluted CBTC techniques for the evaluation of stent architecture and lumen opacification. Gray-scale intensity values perpendicular to the lumen revealed similar intensity values along the neighboring parenchyma, vessel wall, and lumen for the two different contrast techniques. Conclusion Intra-arterial CBCT angiography can be performed without contrast dilution and still achieve adequate image quality in certain cerebral aneurysms treated with flow diverter. The non-diluted contrast technique avoids the time loss during preparation of diluted contrast and installation of diluted contrast to the injector in angiography suites with a single power injector.

Dose and Image Quality Evaluation of a Dedicated Cone-Beam CT System for High-Contrast Neurologic Applications

2010 ◽  
Vol 194 (2) ◽  
pp. W193-W201 ◽  
Author(s):  
Lifeng Yu ◽  
Thomas J. Vrieze ◽  
Michael R. Bruesewitz ◽  
James M. Kofler ◽  
David R. DeLone ◽  
...  
Keyword(s):  
Image Quality ◽  
Quality Evaluation ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
High Contrast ◽  
Image Quality Evaluation ◽  
Ct System

A 3D printed phantom for Image Quality Assessment in Cone-beam CT

2018 ◽  
Vol 52 ◽  
pp. 170
Author(s):  
James O’Halloran ◽  
Paddy Gilligan ◽  
Sinead Cleary ◽  
Susan Maguire ◽  
Gerald O’Connor ◽  
...  
Keyword(s):  
Image Quality ◽  
Quality Assessment ◽  
Image Quality Assessment ◽  
Cone Beam Ct ◽  
Cone Beam ◽  
3D Printed

Minimization of over-ranging in helical volumetric CT via hybrid cone beam image reconstruction-Benefits in dose efficiency

2008 ◽  
Vol 35 (7Part1) ◽  
pp. 3232-3238 ◽  
Author(s):  
Xiangyang Tang ◽  
Jiang Hsieh ◽  
Fang Dong ◽  
Jiahua Fan ◽  
Thomas L. Toth
Keyword(s):  
Image Reconstruction ◽  
Cone Beam ◽  
Beam Image ◽  
Dose Efficiency ◽  
Volumetric Ct

Improved image quality of cone beam CT scans for radiotherapy image guidance using fiber-interspaced antiscatter grid

2014 ◽  
Vol 41 (6Part1) ◽  
pp. 061910 ◽  
Author(s):  
Uros Stankovic ◽  
Marcel van Herk ◽  
Lennert S. Ploeger ◽  
Jan-Jakob Sonke
Keyword(s):  
Image Quality ◽  
Image Guidance ◽  
Cone Beam Ct ◽  
Ct Scans ◽  
Cone Beam ◽  
Antiscatter Grid
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