• Title/Summary/Keyword: 초음파 C 스캔 영상

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Medical Application of the Nondestructive Ultrasonic Tests: Diagnosis of Micro Bone Fractures using Ultrasonic C Scan Images (비파괴 초음파 검사법의 의학적 활용: 초음파 C 스캔 영상을 이용한 미세 골절의 진단)

  • Choi, Min-Joo
    • Journal of the Korean Society for Nondestructive Testing
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    • v.22 no.4
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    • pp.377-385
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    • 2002
  • Ultrasonic tests employing non-ionizing radiation are preferred in nondestructive examinations since they are safe and simple in use. The same principles of the techniques have been taken as valuable tools in medical area for the diagnoses of diseases, in other words, defects of the human body. The paper overviews the principles of the medical diagnosis based on nondestructive ultrasonic tests, and then evaluates experimentally the clinical potential of C scan images not popular in medicine, for detecting the micro fractures of the cortical bone. In the experiment the micro bone fractures were created on the femurs of porks by loading three point bending forces (2-4kN) with the speed of 1 mm/min. As the extent of the fracture was altered, not only X ray images but also ultrasonic C scan images using a focused ultrasonic probe resonated at 25 MHz were obtained. The results showed that ultrasonic C scan images were capable of detecting the micro bone fractures which were not possible to identify by conventional X ray images.

Development of Double Rotation C-Scanning System and Program for Under-Sodium Viewing of Sodium-Cooled Fast Reactor (소듐냉각고속로 소듐 내부 가시화를 위한 이중회전구동 C-스캔 시스템 및 프로그램 개발)

  • Joo, Young-Sang;Bae, Jin-Ho;Park, Chang-Gyu;Lee, Jae-Han;Kim, Jong-Bum
    • Journal of the Korean Society for Nondestructive Testing
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    • v.30 no.4
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    • pp.338-344
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    • 2010
  • A double rotation C-scanning system and a software program Under-Sodium MultiVIEW have been developed for the under-sodium viewing of a reactor core and in-vessel structures of a sodium-cooled fast reactor KALIMER-600. Double rotation C-scanning system has been designed and manufactured by the reproduction of double rotation plug of a reactor head in KALIMER-600. Hardware system which consists of a double rotating scanner, ultrasonic waveguide sensors, a high power ultrasonic pulser-receiver, a scanner driving module and a multi channel A/D board have been constructed. The functions of scanner control, image mapping and signal processing of Under-Sodium MultiVIEW program have been implemented by using a LabVIEW graphical programming language. The performance of Under-Sodium MultiVIEW program was verified by a double rotation C-scanning test in water.

Development of Image Processing Software for UT-NDE of Steam Generator of Nuclear Power Plant (핵발전소 증기발생기의 초음파 비파괴 평가를 위한 영상처리 소프트웨어 개발)

  • Lee, Young-Seock;Nam, Myoung-Woo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.2
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    • pp.226-231
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    • 2007
  • This paper describes a development of ultrasonic examination analysis software to analyze steam generator of nuclear power plant. The developed software includes classical analysis method such as A, B, C and D-scan images. This software provides the information of shape, depth, size and position of flaws. To do such, we obtain raw data from specimens and/or real pipeline of power plants and, modify the obtained ultrasonic 1-dimensional data according to prepared software design schedule. The developed analysis software is applied to specimens containing various flaws with known dimensions. The results of applications showed that the developed software provided accurate and enhanced images of flaws on various specimens.

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Nondestructive Evaluation Technique of Painted Sandwich Control Surfaces of CN-235 using Full-field Pulse-echo Ultrasonic Propagation Imaging System (전영역 펄스-에코 초음파전파영상화 시스템의 CN-235의 도색된 샌드위치 조종면 In-situ 비파괴평가 기술)

  • Hong, Seung-Chan;Lee, Jung-Ryul;Park, Jongwoon
    • Composites Research
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    • v.29 no.5
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    • pp.288-292
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    • 2016
  • In this paper, a novel ultrasonic propagation imaging system, called a full-field pulse-echo ultrasonic propagation imaging (FF PE UPI) system is introduced. The system nondestructively inspected targets with two-axis translation stage. The coincident laser beams for ultrasonic sensing and generation are scanned and pulse-echo mode laser ultrasounds are captured. This procedure makes it possible to generate full-field ultrasound in through-the-thickness direction as large as the scan area. Structural inspection results in the form of full-field ultrasonic wave propagation videos are introduced, which are painted sandwich control surfaces. In addition, the inspection results of FF PE UPI system are compared with conventional ultrasonic testing methods such as waterjet and portable C-scan.

Evaluation of Internal Defect of Composite Laminates Using A Novel Hybrid Laser Generation/Air-Coupled Detection Ultrasonic System (레이저 발생 초음파와 공기 정합 수신 탐촉자를 이용한 복합재료 적층판의 내부 박리 결함 평가)

  • Lee, Joon-Hyun;Lee, Seung-Joon;Byun, Joon-Hyung
    • Journal of the Korean Society for Nondestructive Testing
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    • v.28 no.1
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    • pp.46-53
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    • 2008
  • Ultrasonic C-scan technique is one of very popular techniques being used for detection of flaws in polymer matrix composite(PMC). However, the application of this technique is very limited for evaluation of defects in PMC fabricated by the automated fiber placement process. The purpose of this study is to develop a novel ultrasonic hybrid system based on nondestructive and non-contact ultrasonic techniques for evaluation of delamination in carbon/epoxy and carbon/PPS composite laminates. It was shown that the newly developed ultrasonic hybrid system based on dual air-coupled pitch-catch technique with ultrasonic scattering reflection concept could provide excellent image with higher resolution of delamination in PMC compared with the conventional pitch-catch method. It is expected that this ultrasonic hybrid technique can be applied for on-line inspection of flaws in PMC during the fabrication process.

Differences in the Clinical Characteristics of Children with Urinary Tract Infections Based on the Results of $^{99m}Tc$-Dimercaptosuccinic Acid Renal Scanning (요로감염 소아에서 입원 초기 시행한 DMSA 신 스캔 결과에 따른 임상양상의 차이에 대한 연구: DMSA 신 스캔의 임상적 의미)

  • Kim, Dong Ouk;Lee, Sang Min;Lee, Jeong Bong;Ko, Young Bin;Kim, Su Jin
    • Childhood Kidney Diseases
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    • v.17 no.2
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    • pp.110-116
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    • 2013
  • Purpose: The $^{99m}Tc$-Dimercaptosuccinic acid (DMSA) renal scan is used primarily for the diagnosis of renal scarring and acute pyelonephritis in children with urinary tract infections (UTI). This study aimed to evaluate clinical differences based on the positive or negative results of DMSA scans and kidney ultrasonography (US) in pediatric UTI. Method: We retrospectively reviewed 142 pediatric patients with UTI who were admitted to Myongji Hospital from January 2004 to December 2012. We performed a comparative analysis of clinical parameters such as age, sex, white blood cell (WBC) count, neutrophil count, blood urea nitrogen (BUN) level, creatinine (Cr) level, C-reactive protein (CRP) level, and durations of hospitalization and fever, grouped by the results of the DMSA scans and kidney US. Results: The mean age of the patients was $33.8{\pm}48.3$ months, and 78 (55%) were male. Fifty-two patients had abnormal DMSA findings, and 71 patients had abormal kidney US findings (test positive groups). In the DMSA scan positive group, there were significant differences in age, WBC counts, neutrophil counts, CRP level, BUN level, Cr level, hospitalization duration, number of abnormal findings on kidney US, and incidence of vesicoureteral reflux (VUR) compared with the scan negative group. The kidney US positive group had significant differences in age, neutrophil count, CRP level, BUN level, Cr level, hospitalization duration, number of abnormal findings on the DMSA scans, and more frequent VUR compared with the US negative group. Conclusion: Our data suggest that there were no major differences in clinical parameters based on the results of the DMSA scans compared with kidney US in pediatric UTI. However, as kidney US and DMSA scan were performed to predict VUR, the sensitivity and negative predictive value was increased.

Development of 3D Image Processing Software using EMD for Ultrasonic NDE (EMD를 이용한 초음파 비파괴 평가용 3차원 영상처리 소프트웨어 개발)

  • Nam, Myung-Woo;Lee, Young-Seock;Yang, Ok-Yul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.6
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    • pp.1569-1573
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    • 2008
  • This paper describes a development of Ultrasonic NDE software to analyze steam generator of nuclear power plant. The developed software includes classical analysis method such as A, B, C and D-scan images. And it can analyze the detected internal cracks using 3D image processing method. To do such, we obtain raw data from specimens of real pipeline of power plants, and get the envelope signal using Empirical Mode Decomposition from obtained ultrasonic 1-dimensional data. The reconstructed 3D crack images offer useful information about the location, shape and size of cracks, even if there is no special 2D image analysis technique. The developed analysis software is applied to specimens containing various cracks with known dimensions. The results of application showed that the developed software provided accurate and enhanced 2D images and reconstructed 3D image of cracks.

Enhancement of Ultrasonic C-scan Images for Inspection of Multi-layered Composite Panels (다층 후판 복합재 패널의 결함 검출을 위한 C-Scan 이미지 보정기법)

  • Cho Hyun;Song Sung-Jin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2006.05a
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    • pp.264-267
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    • 2006
  • One of the serious problems that make the flaw identification in a multi-layered thick composite panel more difficult is the interferenceeffect of the upper layer. To take care of such a problem, here we propose an image enhancement approach that can get rid of such an interference effect to ultrasonic C-scan images by a normalization of the acquired signals by a reference signals, and demonstrate its performance in the experiments. Specifically, three specimens with artificial flaws are prepared and ultrasonic C-scan images are acquired experimentally to eliminate the undesired interference effect. Cleat successes are observed in the present study demonstrating the high potential of the proposed algorithm as a practical image enhancement tool in many practical situations.

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Feasibility Study on Ultrasonic Waveguide Sensor for Under-Sodium Viewing of Reactor Internals in Sodium-Cooled Fast Reactor (소듐냉각고속로 원자로 내부구조물의 소듐내부가시화를 위한 웨이브가이드 초음파센서의 적용 가능성 연구)

  • Joo, Young-Sang;Lim, Sa-Hoe;Park, Chang-Gyu;Lee, Jae-Han
    • Journal of the Korean Society for Nondestructive Testing
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    • v.28 no.4
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    • pp.364-371
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    • 2008
  • Ultrasonic waveguide sensor has been developed for under-sodium viewing of reactor internal structures of a sodium-cooled fast reactor (SFR). The structure design concept of a waveguide sensor assembly was suggested and evaluated for the application in SFR. A 10 m long ultrasonic waveguide sensor assembly has been manufactured and the experimental feasibility tests were carried out. The 10 m long distance propagation performance of zero-order antisymmetric $A_0$ Lamb wave has been verified. The feasibility of ultrasonic waveguide sensor has been demonstrated by the C-scanning resolution performance test.

The Usefulness of $^{99m}Tc$-Sestamibi Scan in Preoperative Localization in Primary Hyperparathyroidism (원발성 부갑상선 기능 항진증의 수술전 병소확인에서 $^{99m}Tc$-Sestamibi 스캔의 유용성)

  • Baik, S.H.;Kim, S.M.;Choi, K.M.;Choi, Y.S.;Kim, S.J.;Yu, J.M.;Choi, D.S.;Choe, J.C.
    • The Korean Journal of Nuclear Medicine
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    • v.29 no.4
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    • pp.465-472
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    • 1995
  • An accurate preoperative localization in patients with primary hyperparathyroidism is important for successful surgical intervention. There are many methods for the localization of the primary hyperparathyroidism such as ultrasonography, computerized tomography(CT), magnetic resonance imaging(MRI), angiography and $^{201}T1/^{99m}Tc$ subtraction scan. Among them $^{201}T1/^{99m}Tc$ subtraction scan is known as the most accurate tool for preoperative localization. Recently $^{99m}Tc$-Sestamibi has been used for parathyroid gland imaging. We experienced 19 primary hyperparathyroidisms accurately localized with $^{201}T1/^{99m}Tc$ subtraction imaging and $^{99m}Tc$-Sestamibi. The sensitivities of the $^{99m}Tc$-Sestanibi, $^{201}T1/^{99m}Tc$ subtraction imaging, CT and US were 100%(5/5), 89.5%(17/19) and 61.7(12/19) respectively. With the combination of $^{99m}Tc$-Sestamibi and $^{201}T1/^{99m}Tc$ subtraction imaging we could localize with 100% accuracy. Although the case number is small, this study suggests that the $^{99m}Tc$-Sestamibi parathyroid scan is very useful and easy to use for preoperative localization in primary hyperparathyroidism.

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