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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Nondestructive Testing
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Journal DOI :
The Korean Society for Nondestructive Testing
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Volume & Issues
Volume 32, Issue 6 - Dec 2012
Volume 32, Issue 5 - Oct 2012
Volume 32, Issue 4 - Aug 2012
Volume 32, Issue 3 - Jun 2012
Volume 32, Issue 2 - Apr 2012
Volume 32, Issue 1 - Feb 2012
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Comparison of Vibrational Displacements Generated by Different Types of Surface Source in a Soft Tissue
Park, Jeong Man ; Kwon, Sung-Jae ; Jeong, Mok-Kun ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 469~483
DOI : 10.7779/JKSNT.2012.32.5.469
The propagation characteristics of a mechanical wave in human soft tissue depend on its elastic properties. Investigation of these propagation characteristics is of paramount importance because it may enable us to diagnose cancer or tumor from the vibration response of the tissue. This paper investigates and compares displacement patterns generated in soft tissue due to several forms of low-frequency vibration sources placed on a surface. Among vibration sources considered are a normal load, tangential load, and antiplane shear load. We derive analytical expressions for displacements in viscoelastic single layers, and calculate displacement patterns in half space and infinite plate type tissue. Also, we simulate the vibration response of a finite-sized tissue using finite element method. The effects of the type of stress, the size and frequency of vibration sources, and medium boundaries on displacement patterns are discussed.
Algorithms for Ultrasound Elasticity Imaging
Kwon, Sung-Jae ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 484~493
DOI : 10.7779/JKSNT.2012.32.5.484
Since the 1980s, there have been many research activities devoted to quantitatively characterizing and imaging human tissues based on sound speed, attenuation coefficient, density, nonlinear B/A parameter, etc., but those efforts have not yet reached the stage of commercialization. However, a new imaging technology termed elastography, which was proposed in the early 1980s, has recently been implemented in commercial clinical ultrasound scanners, and is now being used to diagnose prostates, breasts, thyroids, livers, blood vessels, etc., more quantitatively as a complementary adjunct modality to the conventional B-mode imaging. The purpose of this article is to introduce and review various elastographic algorithms for use in quasistatic or static compression type elasticity imaging modes. Most of the algorithms are based on the crosscorrelation or autocorrelation function methods, and the fundamental difference is that the time shift is estimated by changing the lag variable in the former, while it is directly obtained from the phase shift at a fixed lag in the latter.
Pulsatility Index of Blood Echogenicity of the Human Radial and Common Carotid Arteries: Relation with Age and Stroke
Bok, Tae-Hoon ; Kong, Qi ; Nam, Kweon-Ho ; Choi, Jay Chol ; Paeng, Dong-Guk ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 494~501
DOI : 10.7779/JKSNT.2012.32.5.494
In the present paper, the ultrasound blood images were measured at both the human radial artery(RA) and common carotid artery(CCA), depending on the age, and the pulsatility index of blood echogenicity(PIBE) was analyzed. In addition, the ultrasound blood images were measured at both RA and CCA of both the stroke patients and the control group, and PIBE was compared. PIBE of RA for the young group was similar with that for the old group (
). PIBE of CCA for the young group, however, was larger than that for the old group (
), and was more variable depending on the subject. Similarly, the fibrinogen concentrations of the patients (
) were more than that of the control group (
), for both RA and CCA. The results indicate the possibility of the ultrasonic test on the correlation between erythrocyte aggregation and stroke, and it is expected that the in-vivo EA measurement would be clinically useful.
Dependences of Ultrasonic Parameters for Osteoporosis Diagnosis on Bone Mineral Density
Hwang, Kyo Seung ; Kim, Yoon Mi ; Park, Jong Chan ; Choi, Min Joo ; Lee, Kang Il ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 502~508
DOI : 10.7779/JKSNT.2012.32.5.502
Quantitative ultrasound technologies for osteoporosis diagnosis measure ultrasonic parameters such as speed of sound(SOS) and normalized broadband ultrasound attenuation(nBUA) in the calcaneus (heel bone). In the present study, the dependences of SOS and nBUA on bone mineral density in the proximal femur with high risk of fracture were investigated by using 20 trabecular bone samples extracted from bovine femurs. SOS and nBUA in the femoral trabecular bone samples were measured by using a transverse transmission method with one matched pair of ultrasonic transducers with a center frequency of 1.0 MHz. SOS and nBUA measured in the 20 trabecular bone samples exhibited high Pearson's correlation coefficients (r) of r = 0.83 and 0.72 with apparent bone density, respectively. The multiple regression analysis with SOS and nBUA as independent variables and apparent bone density as a dependent variable showed that the correlation coefficient r = 0.85 of the multiple linear regression model was higher than those of the simple linear regression model with either parameter SOS or nBUA as an independent variable. These high linear correlations between the ultrasonic parameters and the bone density suggest that the ultrasonic parameters measured in the femur can be useful for predicting the femoral bone mineral density.
Temperature and Frequency Dependences of Ultrasonic Properties in Commercial MC Nylon Polymers
Kim, Myung Deok ; Kim, Yong Tae ; Lee, Kang Il ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 509~517
DOI : 10.7779/JKSNT.2012.32.5.509
In the present study, temperature and frequency dependences of ultrasonic properties such as attenuation coefficient and phase velocity was investigated for six kinds of commercial MC-Nylon polymer samples. The ultrasonic properties of the samples were measured by using a pulse transmission method in water over a broadband frequency range of 2 to 8 MHz. Water temperature was varied from 10 to
interval. The attenuation coefficients of the samples increased with the frequency and the exponent n of frequency dependence ranged within 1.16 to 1.44, slightly deviating from the linear dependence (n=1). The phase velocities of the samples exhibited negative dispersion, i.e., decreasing velocity with increasing frequency, except for ivory sample at
. The frequency-dependent phase velocities of the samples showed the decreasing tendency with increasing temperature.
Study on Development of Non-Destructive Measurement Technique for Viability of Lettuce Seed (Lactuca sativa L) Using Hyperspectral Reflectance Imaging
Ahn, Chi-Kook ; Cho, Byoung-Kwan ; Mo, Chang Yeun ; Kim, Moon S. ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 518~525
DOI : 10.7779/JKSNT.2012.32.5.518
In this study, the feasibility of hyperspectral reflectance imaging technique was investigated for the discrimination of viable and non-viable lettuce seeds. The spectral data of hyperspectral reflectance images with the spectral range between 750 nm and 1000 nm were used to develop PLS-DA model for the classification of viable and non-viable lettuce seeds. The discrimination accuracy of the calibration set was 81.6% and that of the test set was 81.2%. The image analysis method was developed to construct the discriminant images of non-viable seeds with the developed PLS-DA model. The discrimination accuracy obtained from the resultant image were 91%, which showed the feasibility of hyperspectral reflectance imaging technique for the mass discrimination of non-viable lettuce seeds from viable ones.
A Non-Invasive Ultrasonic Urinary Bladder Internal Pressure Monitoring Technique: Its Theoretical Foundation and Feasibility Test
Choi, Min Joo ; Kang, Gwan Suk ; Lee, Kang Il ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 526~539
DOI : 10.7779/JKSNT.2012.32.5.526
A new approach was proposed in this article, named, a non-invasive ultrasonic method to monitor the urinary bladder internal pressure which can resolve the shortcomings of the existing methods. The proposed method makes use of acoustic cavitation. It is based on a physical phenomenon that an extracorporeal high intensity focused ultrasonic pulse generates bubbles inside the urinary bladder and the dynamic properties of the bubbles are related to the urinary bladder internal pressure. The article presents the theoretical foundation for the proposed technique and verifies its feasibility with preliminary experimental data. The suggested ultrasonic urinary bladder internal pressure monitoring method is non-invasive and can be used any time regardless of sex and age, so that it will be of a great benefit to the diagnosis and therapy of urination related diseases.
A Software Approach for the Realtime Received Signal Processing in Magnetostrictive Long-Range Ultrasonic Testing
Heo, Won Nyoung ; Lim, Hyung Taik ; Kim, Tae Gyung ; Choi, Myoung Seon ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 540~544
DOI : 10.7779/JKSNT.2012.32.5.540
Like the phase array based ultrasonic system, complicated electronics has been used for real time signal processing in the magnetostrictive long-range ultrasonic testing(LRUT) system. This study shows that the software approach including the phase compensation, noise filtering and waveform transformation takes advantage rather than the previous hardware approach. Furthermore, it is possible for the software approach to be able more flexible and efficient realtime signal processing. These results will contribute to a cost-effective LRUT system and analysis of the inspection data.
Scale Thickness Measurement of Steam Generator Tubing Using Eddy Current Signal of Bobbin Coil
Kim, Chang-Soo ; Um, Ki-Soo ; Kim, Jae-Dong ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 545~550
DOI : 10.7779/JKSNT.2012.32.5.545
Steam generator is one of the major components of nuclear power plant and steam generator tubes are the pressure boundary between primary and secondary side, which makes them critical for nuclear safety. As the operating time of nuclear power plant increases, not only damage mechanisms but also scaled deposits on steam generator tubes are known to be problematic causing tube support flow hole blockage and heat fouling. The ability to assess the extent and location of scaled deposits on tubes became essential for management and maintenance of steam generator and eddy current bobbin data can be utilized to measure thickness of scale on tubes. In this paper, tube reference standards with various thickness of scaled deposit has been set up to provide information about the overall deposit condition of steam generator tubes, providing essential tool for steam generator management and maintenance to predict and prevent future damages. Also, methodology to automatically measure scale thickness on tubes has been developed and applied to field data to estimate overall scale amount.
Beamforming Technology in Medical Ultrasound System
Bae, Moo-Ho ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 551~563
DOI : 10.7779/JKSNT.2012.32.5.551
Medical ultrasound systems have been used since 1950s, and are now widely used in most hospitals as indispensable diagnostic imaging systems. Since array probe was introduced in 1970s, beamforming technology using electronic signal processing has been adopted to the medical ultrasound system, and has been improved. Beamforming is a important technology which defines the resolution of the ultrasound system. In this paper, the technologies are introduced from basic beamforming principles to current trend. They include principles of beamforming using array probe, basic theory, and practical implementation, and recent topics of synthetic aperture imaging, adaptive beamforming, 2-dimensional beamforming using 2-dimensional array are also introduced. These various technologies will improve system performances continuously by merging innovatively with various technologies in other fields.
Physics of Harmonic Imaging
Choi, Min Joo ; Yang, Jeong Hwa ; Paeng, Dong-Guk ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 564~572
DOI : 10.7779/JKSNT.2012.32.5.564
Harmonic imaging is introduced in the present article and its principle and physical characteristics is described in contrast to conventional ultrasonic imaging. The principle of the conventional image which uses ultrasonic echoes reflected at the interfaces between tissues is presented, and the nonlinear ultrasonic propagation which results in harmonic components is conceptually described. The pulse inversion technique which effectively extracts the harmonic components from the ultrasonic echo signals is introduced, and the advantages of the constructed harmonic images are summarized comparing with those of conventional ultrasonic images. The harmonic images are classified according to the mechanism of harmonic production, and the typical harmonic images obtained from patients are presented in contrast to the corresponding sonograms. Clinical significance and prospects of harmonic imaging and the future research areas are discussed.
Medical Ultrasonic Elasticity Imaging Techniques
Jeong, Mok-Keun ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 573~584
DOI : 10.7779/JKSNT.2012.32.5.573
Breast and prostate tumors or cancers tend to be stiffer than the surrounding normal tissue. However, the difference in echogenicity between cancerous and normal tissues is not clearly distinguishable in ultrasound B-mode imaging. Thus, imaging the stiffness contrast between the two different tissue types helps to diagnose lesions quantitatively, and such a method of imaging the elasticity of human tissue is termed ultrasound elasticity imaging. Recently, elasticity imaging has become an effective complementary diagnostic modality along with ultrasound B-mode imaging. This paper presents various elasticity imaging methods that have been reported up to now and describes their characteristics and principles of operation.
Piezoelectric Polymer Ultrasound Transducers and Its Biomedical Applications
Ha, Kang-Lyeol ; Cao, Yonggang ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 585~596
DOI : 10.7779/JKSNT.2012.32.5.585
PVDF(poly vinylidene fluoride) and P(VDF-TrFE)(poly vinylidene fluoride-tetrafluoroethylene) are the typical piezoelectric polymers with unique properties. Even they are inferior to conventional piezoelectric ceramics PZT in electromechanical conversion efficiency and interior loss, though they are superior in receiving sensitivity and frequency bandwidth. Their acoustic impedances are relatively close to water or biological tissue and it is easier to make thin film than other piezoelectric materials. Futhermore, the film is so flexible that it is easy to attach on a complex surface. Those properties are suitable for the ultrasound transducers which are useful for medical and biological application, so that various types of polymer transducers have been developed. In this paper, several important considerations for design and fabrication of piezoelectric polymer transducers were described and their effect on the transducer performance were demonstrated through the KLM model analysis. Then, it was briefly reviewed about the structures of the polymer transducers developed for obtaining images as well as the characteristics of the images in several important medical and biological application fields.
Principle of Digital Image Correlation
Kim, Kyeong-Suk ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 597~602
Piezoelectric Mechanical Vibration Energy Harvesting
Kim, Mi So ;
Journal of the Korean Society for Nondestructive Testing, volume 32, issue 5, 2012, Pages 603~610