Mário Santos, Jaime Santos, P.N.B. Reis, Ana M. Amaro,
Abstract In the present work, different ultrasonic C-scan approaches were used to evaluate Carbon Fiber Reinforced Polymers (CFRP) submitted to impacts of low energy, in order to evaluate their effectiveness for ... question how useful could be the air-coupled C-scan approach, using low frequencies, for in-service application. ... with 1.5 and 3 J. Then, ultrasonic C-scan images were produced by immersion pulse-echo (in ... also by air-coupling through-transmission. The immersion C-scan images were produced using 5, 10 and 20 ...
Tópico(s): Thermography and Photoacoustic Techniques
2021 - De Gruyter | Materials Testing
Mirjam EJ van Velthoven, Koos de Vos, Frank D. Verbraak, Chris W. Pool, Marc D. de Smet,
... a confocal image of the same area (OCT C-scans). Creating an overlay image of a conventional angiographic ... their aid in improving the interpretation of OCT C-scans.In various patients, en-face OCT C-scans (made with a prototype OCT-Ophthalmoscope (OTI, Canada) ... overlay-image. The confocal part of the OCT C-scan was used to spatially transform the FA image onto the OCT C-scan, using the vascular arcades as a reference. To ... visualization the transformed angiographic image and the OCT C-scan were combined in an RGB image.The confocal ...
Tópico(s): Retinal and Optic Conditions
2005 - BioMed Central | BMC Ophthalmology
Xiaokui Li, Michael Jones, Timothy Irvine, Rosemary A. Rusk, Yoshiki Mori, Ikuo Hashimoto, Olaf T. von Ramm, Jun Li, Arthur D. Zetts, James Pemberton, David J. Sahn,
... sector planes (B-scans) and parallel cutting planes (C-scans, which are planes perpendicular to the direction of ... LV SVs of the RT3DE and electromagnetic methods (C-scans: LV, r = 0.98, standard error of the ... in this model, the correlation was closer for C-scans than B-scans for RV SV. AR volume estimation also showed that C-scan (r = 0.93, SEE = 4.23 mL, P < . ... derived AR fraction showed closer correlation than did C-scan (r = 0.82 vs r = 0.85, respectively). ... ability to reliably quantify both LV (B- and C-scans) and RV SVs and to assess the severity ...
Tópico(s): Pulmonary Hypertension Research and Treatments
2004 - Elsevier BV | Journal of the American Society of Echocardiography
Rosemary A. Rusk, Yoshiki Mori, Crispin H. Davies, Timothy Irvine, Antoinette Kenny, David J. Sahn,
... standard long-axis (B-scan) and short-axis (C-scan) views in a simplified but quantifiable left ventricular ... Chamber" and "mass" measurements for both B and C scans correlated closely with the actual values (r = 0.99). However, chamber volumes from C scans were consistently less than B-scan values (mean difference from reference for C scans: -5.2 +/- 1.2 mL, P <.0001; for ... 1.7 +/- 2.9 mL) than those of C scans, which tended to underestimate (-4.5 +/- 2.5 ... closer to the actual values than those from C-scan views, presumably since they are less highly influenced ...
Tópico(s): Advanced MRI Techniques and Applications
2000 - Elsevier BV | Journal of the American Society of Echocardiography
Hui Zhang, Si Liu, Xiaobo Rui, Xiaoxi Zhu, Jing Sun,
... structures. Due to the blurry edges on the C-scan image caused by honeycomb units with periodic honeycomb ... quantification of HSS based on air-coupled ultrasonic C-scan and hexagonal units reconstruction is proposed. The debonding ... presented with key steps as ultrasonic air-coupled C-scan for HSS, hexagonal units reconstruction based on peak points on C-scan images, units classification by K-means clustering algorithm, ... it is ideally suited for air-coupled ultrasonic C-scan image processing of periodic structures.
Tópico(s): Non-Destructive Testing Techniques
2022 - Elsevier BV | Applied Acoustics
Sebastian T. Schindera, P Mehwald, David J. Sahn, Deniz Kececioglu,
... volumes were determined by tracing derived B- and C-scans, using the Simpson rule.Multiple regression analyses showed ... the static volumes (B-scan, r = 0.99; C-scan, r = 0.98; P < .001), as well as ... the dynamic model (B-scan, r = 0.90; C-scan, r = 0.86; P < .001). However, the C-scans tended to underestimate cavity and stroke volumes more ... static volume: B-scan, 1.4% +/- 9.8%; C-scan, -7.4% +/- 8.0%; P < .001; mean difference ... stroke volumes: B-scan, 3.0% +/- 19.1%; C-scan, -2.5% +/- 20.9%; P < .001).Real-time ...
Tópico(s): Congenital Heart Disease Studies
2002 - Wiley | Journal of Ultrasound in Medicine
Anthony Chukwujekwu Okafor, A Dutta,
... for predicting the damage size and depth from C-Scan results using neural networks is also presented. Two ... were carried out on a DIGITALWAVE immersion type C-Scan system. PRF values from 100 to 5000 Hz ... locations were clearly observed as peaks in the C-Scan mesh. The equivalent hole diameter, depth and the ... to a predetermined edge were calculated from the C-Scan plots and correlated with the actual values to ... found between the calculated diameter obtained from the C-Scan results and the actual hole diameter. Low PRF ...
Tópico(s): Thermography and Photoacoustic Techniques
2001 - Elsevier BV | NDT & E International
Brian S. Boxer Wachler, Ronald R. Krueger,
... devices.Mean pupil diameter measurements with the Technomed C-Scan, Humphrey Masterview, Alcon EyeMap, and under a mesopic ... one another except those by the Masterview and C-Scan devices. The mean difference between the C-Scan and luminance-matched infrared measurements was 0.74 ... 12 mm and 1.56 mm for the C-Scan and Masterview devices, respectively. Coefficients of repeatability were ... 46 mm, and 0.44 mm for the C-Scan, Masterview, and EyeMap devices, respectively.Although topography pupillometry ... The difference in limits of agreement between the C-Scan and Masterview devices may be explained by pupil ...
Tópico(s): Optical Imaging and Spectroscopy Techniques
2000 - Lippincott Williams & Wilkins | Journal of Cataract & Refractive Surgery
Wenqing Song, Jin Ren, Peng He, Jingru Sun, Junmiao Shi, Jiangtao Xiong, Jinglong Li,
Ultrasonic C-scan was conducted to detect the defect size of TC4 diffusion-bonded joints quantitatively. Additionally, C-scan images were obtained using the amplitudes of time- ... the characteristic parameters. The results demonstrated that the C-scan detection based on the time-domain amplitude was ... the highest detection accuracy was obtained by ultrasonic C-scan based on the power spectrum.
Tópico(s): Advanced machining processes and optimization
2021 - Elsevier BV | Journal of Manufacturing Processes
Jonas Ogien, Olivier Levecq, Hicham Azimani, Arnaud Dubois,
... LC-OCT technique to obtain horizontal section images (C-scans) in addition to B-scans. C-scan imaging is achieved with this dual-mode LC- ... µm is measured for both B-scans and C-scans. The images are acquired in both modes at ... second. The horizontal field of view of the C-scans is 1.2 × 0.5 mm2, identical to ... skin is demonstrated in both B-scan and C-scan modes, with the possibility to navigate within the ...
Tópico(s): Photoacoustic and Ultrasonic Imaging
2020 - Optica Publishing Group | Biomedical Optics Express
Dan Chen, Huifang Xiao, Jinwu Xu,
The accuracy of measuring inclusion size in direct C-scan image of immersion ultrasonic testing is restricted by ... is proposed, which is used to restore the C-scan image and improve the accuracy of inclusion size ... the image is established by restoring the simulated C-scan image and further calibrated with size correction factor. ... show that the inclusion sizes measured in restored C-scan images agree well with the optical micrograph results, ...
Tópico(s): Photoacoustic and Ultrasonic Imaging
2018 - Elsevier BV | Ultrasonics
Junliang Dong, Byungchil Kim, Alexandre Locquet, Peter R. McKeon, Nico F. Declercq, D. S. Citrin,
... have been studied via terahertz imaging and ultrasonic C-scans. The forced delamination is created by inserting Teflon ... imaging, we find high-resolution, low-artifact terahertz C-scan and B-scan images locating and sizing the ... and of the layers constituting the laminate. Ultrasonic C-scan images are also successfully obtained; however, in our ... transducers. Comparative analysis between terahertz imaging and ultrasonic C-scans with regard to spatial resolution is carried out ... as an alternative or complementary modality to ultrasonic C-scans for this class of glass fiber-reinforced composites.
Tópico(s): Ultrasonics and Acoustic Wave Propagation
2015 - Elsevier BV | Composites Part B Engineering
Angelika Wronkowicz, Andrzej Katunin, Krzysztof Dragan,
... inspection of aircraft composite elements is an ultrasonic C-Scan technique which application results in planar images of ... damage occurrence it is difficult to analyze resulting C-Scan images. Therefore, using assistance based on image processing ... algorithm an extraction of damage visualization from a C-Scan image as well as its characterization and 3D ... diagnosing of composite structures with impact damage using C-Scan technique.
Tópico(s): Thermography and Photoacoustic Techniques
2015 - | International Journal of Image Graphics and Signal Processing
Jing Liu, Guocheng Xu, Xiaopeng Gu, Guanghao Zhou, Yongkui Hao,
In this paper, ultrasonic C-scan detection is conducted on stainless steel spot welds, and C-scan images are obtained respectively through characteristic signal analysis in time domain and frequency domain. C-scan image of frequency domain characteristics signal, which is ... reflect the weld nugget morphology more truly. After C-scan image enhancement and edge detection processing, the dimension ...
Tópico(s): Ultrasonics and Acoustic Wave Propagation
2014 - The Iron and Steel Institute of Japan | ISIJ International
Vishali Gupta, Pulkit Gupta, Mohit Dogra, Amod Gupta,
... on spectral domain OCT transverse and RPE fit C-scans corresponding to the leakage point observed on fundus ... HD-OCT Model 4000. Transverse and RPE fit C-scans corresponding to point of leakage were superimposed on ... presentation and follow-up.Transverse and RPE fit C-scans showed an irregularity of RPE resembling a 'honeycomb' ... a disruption/breach in the RPE on transverse C-scan and on RPE fit C-scan. All eyes showed a resolution of subretinal fluid ...
Tópico(s): Optical Coherence Tomography Applications
2009 - Springer Nature | Eye
Produção Nacional
Revisado por pares
Rita Cristina M. R. Moura, Barry L. Bowyer, Scott Stevens, J. James Rowsey,
... of three commercially available videokeratoscopes [EyeSys, Tech-noMed C-Scan, and PAR Corneal Topography System (CTS)] with the ... 35%, followed by PAR-CTS at 25% and C-Scan at 5%. Among the videokeratoscopy units, EyeSys and ... at 65%. The correlation between the Tech-noMed C-Scan and both the EyeSys and PAR-CTS systems ... EyeSys = 43.49 D; PAR = 43.48 D; C-Scan = 43.83 D). Comparing the 10 measurements of ... PAR-CTS, and 0.31 D for the C-Scan systems. Conclusion Based on this study, we should ...
Tópico(s): Ophthalmology and Visual Impairment Studies
1998 - Lippincott Williams & Wilkins | Cornea
Carmelo Mineo, Jonathan Riise, Rahul Summan, Charles MacLeod, S. Gareth Pierce,
... for the visualisation of three-dimensional (3D) ultrasonic C-scans, suitable for application to high data throughput ultrasonic ... IBT) method presented. The IBT method produces 3D C-scan representation, presented as coloured tessellated surfaces, and the ... critical components). The results demonstrate that the IBT C-scan generation approach runs over 60 times faster than a C-scan display based on Delaunay triangulation and over 500 times faster than surface reconstruction C-scans. In summary, the main benefits of the new ...
Tópico(s): Optical measurement and interference techniques
2018 - British Institute of Non-Destructive Testing | Insight - Non-Destructive Testing and Condition Monitoring
Qiqi Dai, Yee Hui Lee, Hai-Han Sun, Genevieve Ow, Mohamed Lokman Mohd Yusof, Abdulkadir C. Yücel,
... proposed to reconstruct 3D permittivity maps from GPR C-scans. The proposed scheme leverages a prior 3D convolutional ... attention mechanism to suppress the noise in the C-scans due to subsurface heterogeneous soil environments. Then a ... establish the optimal inverse mapping from the denoised C-scans to 3D permittivity maps. Furthermore, a three-step ... networks' capability, generalizability, and robustness in denoising GPR C-scans and reconstructing 3D permittivity maps of subsurface objects.
Tópico(s): Seismic Waves and Analysis
2023 - Institute of Electrical and Electronics Engineers | IEEE Transactions on Geoscience and Remote Sensing
Peng Zhang, Hans W. Linderholm, Björn E. Gunnarson, Jesper Björklund, Deliang Chen,
... the Medieval Climate Anomaly (MCA). Here we present C-Scan, a new Scots pine tree-ring density-based ... CE, extending the previous reconstruction by 250 years. C-Scan is based on samples collected in a confined ... RSFi algorithm to preserve low-frequency signals. In C-Scan, the warm peak of MCA occurs ca. 1000– ... occur in the most recent century. By comparing C-Scan with other millennium-long temperature reconstructions from Fennoscandia, ...
Tópico(s): Geology and Paleoclimatology Research
2016 - Copernicus Publications | Climate of the past
Xinyu Sun, Kai Zeng, Xiaocong He, Long Zhang,
... steel sheets was investigated using scanning acoustic microscopy. C-scan images were used to characterize the weld evolution ... and the failure displacement. The results illustrate that C-scan images can provide information about the internal state ... basis of the A-scan signals and the C-scan images: the weld nugget zone, the heat-affected ...
Tópico(s): Advanced Welding Techniques Analysis
2016 - Taylor & Francis | Nondestructive Testing And Evaluation
Alexander Ehnes, Yaroslava Wenner, Christoph Friedburg, Markus N. Preising, Wadim Bowl, Walter Sekundo, Erdmuthe Meyer zu Bexten, Knut Stieger, Birgit Lorenz,
... Reproducibility of the algorithm was tested in 30 C-scans of 10 healthy subjects each with the Spectralis ... Comparability between different devices was evaluated in 84 C-scans (volume or radial scans) obtained from 21 healthy ... Stratus OCT and the RTVue-100 OCT. Each C-scan was segmented and the mean thickness for each ... three OCT devices. The algorithm correctly segmented a C-scan of a patient with X-linked retinitis pigmentosa. ...
Tópico(s): Retinal Diseases and Treatments
2014 - Association for Research in Vision and Ophthalmology | Translational Vision Science & Technology
Sanjeevareddy Kolkoori, Christian Hoehne, Jens Prager, Michael Rethmeier, Marc Kreutzbruck,
Quantitative evaluation of ultrasonic C-scan images in homogeneous and layered anisotropic austenitic materials is of general importance for understanding the influence of anisotropy on wave ... ray tracing method is presented for evaluating ultrasonic C-scan images quantitatively in general homogeneous and layered anisotropic ... columnar grain orientation and layback orientation on ultrasonic C-scan image is quantitatively analyzed in the context of ...
Tópico(s): Welding Techniques and Residual Stresses
2013 - Elsevier BV | Ultrasonics
Mahsa A. Sohrab, Katherine Wu, Amani A. Fawzi,
... had visible choriocapillaris on either cross section or C-scans (p-value<0.001). When comparing select regions from the most superficial C-scans, early AMD group had lowest vascular density and ... highest (p-value 0.04). Qualitative evaluation of C-scans from all three groups revealed a more granular ... Lack of choriocapillaris on HD cross-sections or C-scans in all RPD and about half of early ...
Tópico(s): Glaucoma and retinal disorders
2012 - Public Library of Science | PLoS ONE
Masaaki Saito, Tomohiro Iida, Dai Nagayama,
... corresponding to the polypoidal lesions on ICGA. Transverse C-scan images showed an irregularity or protrusion of the ... 26 of 28 eyes; in those 26 eyes, C-scan images showed distinctive rings of a highly reflective ... that appeared as a highly reflective area on C-scan images in 32 of the 41 eyes. In ... of the abnormal vascular network.The OCT-ophthalmoscope C-scan images of the irregularity and the protrusion in ...
Tópico(s): Retinal Imaging and Analysis
2008 - Lippincott Williams & Wilkins | Retina
Mahendrasinh Raj, J. C. Pandey,
AbstractAbstractThe present paper presents the analysis of ultrasonic C-scan images obtained through an automatic computerised multiscan immersion ... ultrasonic equipment. The defect size and area in C-scan image was calculated automatically by a labelling and ... 3.5 Hz in the plant.Keywords: ULTRASONIC C-SCAN IMAGING TECHNIQUEELECTROMAGNETIC STIRRERCONTINUOUS CASTINGSTEEL BILLETSDEFECTSCOLUMNAR/EQUIAXED ZONE
Tópico(s): Ultrasonics and Acoustic Wave Propagation
2008 - Taylor & Francis | Ironmaking & Steelmaking Processes Products and Applications
Suhail Alam, Robert J. Zawadzki, Stacey Choi, Christina Gerth‐Kahlert, Susanna S. Park, Lawrence S. Morse, John S. Werner,
... presumed ocular histoplasmosis syndrome. Reconstructed B-scans and C-scans are shown for selected patients to illustrate the ... or complex lesions, and allows B-scan and C-scan reconstructions to be made that provide additional perspectives ... presumed ocular histoplasmosis syndrome. Reconstructed B-scans and C-scans are shown for selected patients to illustrate the ... or complex lesions, and allows B-scan and C-scan reconstructions to be made that provide additional perspectives ...
Tópico(s): Glaucoma and retinal disorders
2006 - Elsevier BV | Ophthalmology
Raimondo Forte, F Pascotto, Giuseppe de Crecchio,
... not only longitudinal B-scan but also coronal C-scan images of the retina.Fifteen eyes of 11 ... on the macula was clearly detectable at coronal C-scan. They appeared as sigmoid hyper-reflective bands in the hyporeflective vitreous chamber. Overlay of C-scans on red-free confocal images allowed the visualization ... to the structures of the posterior pole.The C-scan images allowed clear visualization of the total extension ...
Tópico(s): Intraocular Surgery and Lenses
2006 - Springer Nature | Eye
... has been described in normal eyes utilising coronal “C-scans.”1,2 This study demonstrates the use of 3DUS generated C-scans for optic nerve measurements in orbits with optic ... radiation therapy 6 years earlier. On 3DUS coronal C-scans, an optic nerve sheath diameter (ONSD) 3 mm ...
Tópico(s): Neurofibromatosis and Schwannoma Cases
2005 - BMJ | British Journal of Ophthalmology
To evaluate the use of 3-dimensional ultrasound C-scan imaging for optic nerve diameter measurements.Prospective observational ... eight normal eyes of 32 healthy adults.Coronal C-scans of 38 normal optic nerves were imaged 3 ... 4.6 mm (subjects 50 and older).Coronal C-scans generated from 3-dimensional ultrasound can be used ...
Tópico(s): Glaucoma and retinal disorders
2004 - Elsevier BV | Ophthalmology
Victoria Kramb, Reji John, David A. Stubbs,
... an oxide/oxide ceramic–matrix composite using ultrasonic C-scans. Test specimens were monotonically loaded, removed from the ... tip, which was not indicated by the ultrasonic C-scans. At 950 °C, damage progressed from the notch ... The extent of enhanced ultrasonic attenuation in the C-scans correlated well with the crack length from the ...
Tópico(s): Innovative concrete reinforcement materials
2001 - Elsevier BV | Composites Science and Technology