• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2015.05a
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• pp.148-151
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• 2015

초음파 검사를 이용한 지방간의 등급을 분류하는 진단 결과는 검사자의 주관적 판단으로 시행하므로 검사자 간의 불일치가 발생하여 초음파 검사의 진단 결과에 영향을 미칠 수 있다. 따라서 본 논문에서는 환자와 검사자에게 지방간 등급을 보다 정확하게 진단하기 위한 전단계로서 초음파 영상에서 간과 신장 영역을 추출하는 방법을 제안한다. 제안된 방법을 다양한 초음파 영상에 적용한 결과, 간과 신장 영역이 비교적 정확히 추출되는 것을 확인할 수 있었다. 따라서 제안된 방법이 초음파 영상에서 지방간을 분석하는데 적용할 수 있다.

• Journal of the Korean Society of Radiology
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• v.6 no.3
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• pp.183-189
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• 2012

Ultrasonography is one of the fields on the imaging studies within intra-abdominal organs. A blood test is a typical method of clinical chemical examination on the in vivo test of clinical symptoms. Fatty liver is performed simultaneously two kinds of diagnostics methods, intra-abdominal ultrasound and blood tests. At an implementing this, the standard of blood tests value was the TBIL, TC, AST, ALT, ALP, GGT, TG, HDL-C, GLU. In this study analyzing the accuracy of the two kinds of test, ultrasonography and blood test, on patients with fatty liver. From January to March 2012, patients 459 determined fatty liver within 1350, who received health examination simultaneously on the intra-abdominal ultrasonography and blood tests. Same result of ultrasonography and blood test's patients were 459 ie, 60.8%. and different result of those examinations was 280 ie, 39.2%. Consequently diagnostic accuracy was 60.8%. It presumably caused by differences in the diagnostic performance of ultrasound professionals(Radiologist or Radiological Technologist). In order to overcome this, ongoing educational and study will be needed.

• Journal of the Korean Society of Radiology
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• v.16 no.7
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• pp.927-934
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• 2022

This study attempted to find out the degree of agreement between ultrasound image findings along with analysis of attenuation index and scatter distribution index values within tissues through quantitative measurement analysis using liver ultrasound images. From August 2022 to October 2022, liver ultrasound was performed on 45 patients who were suspected of having fatty liver and who received a prescription for liver ultrasound. As a result of the study, as a result of analyzing the agreement between the ultrasound image findings and the tissue attenuation index, the Kappa value was 0.82 (p<0.05), showing a very high agreement between the two examination methods. In addition, as a result of the agreement analysis between the ultrasound image findings and the scatter distribution index in the tissue, the Kappa value was 0.642 (p<0.05), showing high agreement between the two examination methods. At the time of fat liver prediction, the use of liver ultrasound findings and quantitative ultrasonography techniques, such as intra-tissue attenuation index and intra-tissue scatter distribution index, may be helpful in determining the degree of progression of fatty liver patients.

• The Journal of the Korea Contents Association
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• v.11 no.10
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• pp.342-348
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• 2011

The study aimed to compare the validity between the abdominal ultrasonographic(US) grading system of fatty liver and histologic grading system of fatty liver in living liver donor candidates. As the fatty liver is defined as pathologic total fat >10%, US validity was sensitivity 64.6%, specificity 68%, positive predictive value 76.8%, negative predictive value 54%. As the strict data handling on US grading normal, mild fatty liver are negative, moderate fatty liver is positive, US validity was sensitivity 26.8%, specificity 100%, positive predictive value 100%, negative predictive value 45.5%. ROC curve analysis according to different cut off value of liver-to-kidney brightness ratio was Area under ROC curve=0.859(95% CI=0.795~0.922, state variable= total fat 10%). There were statistically significant difference( p<0.001). Ultrasonography for the fatty diagnosis showed a high validity to predict the result of histology grade of fatty liver.

• Journal of the Korean Society for Nondestructive Testing
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• v.32 no.5
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• pp.540-544
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• 2012

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.

• Nuclear Engineering and Technology
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• v.26 no.2
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• pp.306-311
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• 1994

경수로형 원전의 NSSS 및 2 차계통의 주요부품에 대한 가동전. 중 검사로 수행되는 초음파 검사에 관한 내용을 수록하였다. 경수로형 원전에 적용하고 있는 초음파 검사 기술요건으로 ASME Sec. V및 XI 의 과거 10여년간의 변경과정과 검사기술, 강화된 검사 결과 기록 기준, 검사대상 및 범위에 관하여 언급하였다. 초음파검사의 신뢰성 제고를 위한 신기술의 실제 검사 적용을 유도하는 규격화의 조짐이 89년 ASME Sec. V 및 XI 규격에서 나타나고 있으며, 검사 결과의 평가 해석을 정확히 할 수 있도록 컴퓨터 화한 신호 처리 개념이 수록되어 그 요건을 살펴보았다.

• Journal of radiological science and technology
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• v.40 no.2
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• pp.229-235
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• 2017

In abdominal Ultrasonography, the fatty liver is diagnosed through hepatic parenchymal echo increased parenchymal density and unclear blood vessel boundary, and according to many studies, abdominal Ultrasonography has 60~90% of sensitivity and 84~95% of specificity in diagnosis of fatty liver, but the result of Ultrasonography is dependent on operators, so there can be difference among operators, and quantitative measurement of fatty infiltration is impossible. Among examinees who same day received abdominal Ultrasonography and chest computed tomography (CT), patients who were diagnosed with a fatty liver in the Ultrasonography were measured with liver Hounsfield Units (HU) of chest CT imaging to analyze the accuracy of the fatty liver diagnosis. Among 720 subject examinees, those who were diagnosed with a fatty liver through abdominal Ultrasonography by family physicians were 448, which is 62.2%. The result of Liver HU measurement in the chest CT imaging of those who were diagnosed with a fatty liver showed that 175 out of 720 had the measured value of less than 40 HU, which is 24.3%, and 173 were included to the 175 among 448 who were diagnosed through Ultrasonography, so 98.9% corresponded. This indicates that the operators' subjective ability has a great impact on diagnosis of lesion in Ultrasonography diagnosis of a fatty liver, and that in check up chest CT, under 40 HU in the measurement of Liver HU can be used for reference materials in diagnosis of a fatty liver.

• Journal of radiological science and technology
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• v.31 no.2
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• pp.135-140
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• 2008

Purpose: Fatty liver is one of the most commonly found disease by abdominal ultrasonography. The status of fatty liver is classified into mild, moderate and severe degrees. The study was conducted to investigate the clinical significance of fatty liver using ultrasonography. Materials and method: Test set consisted of 2,185 patients who visited D healthcare center in Daejeon to receive an abdominal ultrasonic test from January to December 2007. Out of the 2185 patients, 524 patients was diagnosed as fatty liver (290 male and 234 female patients). They were divided into three groups, group I for mild degree. II for moderate degree, and III for severe degree, depending on the echo of liver parenchyma, the sound attenuation, and the visibility of intrahepatic blood vessels and diaphragm. Then the correlation of obesity indices, liver function tests and metabolic syndrome was analyzed for males and females separately. Results : As for the degree of fatty liver, 350 cases (66.8%) were classified as group I, 153 cases (29.2%) as group II, and 21 cases (4.1%) as group III. In addition, severe degree of fatty liver was more frequently found in males than in females. The mean ages of three groups for males were 46.1, 44.5, and 39.1, and those for females were 48.8, 50.2, 52.4, respectively. Males with lower mean ages have severely of fatty liver for both males and females. Conclusion: The results in this study show that the classification into three degrees of fatty liver in ultrasonography practice is helpful to treat and observe the progress of fatty liver. In addition, careful examination is required to measure the severity of fatty liver as well as detection of it. A standardized method to classify the degree of fatty liver is also needed for more objective measurement.

• 건강소식
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• v.35 no.7
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• pp.16-17
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• 2011

검사 테이블로 바로 누워 해당 검사 부위에 투명한 젤을 바르고 그 위에 초음파 변환기를 대면 모니터에 실시간 이미지가 떠오르고 이를 관찰하면 된다. 짧게는 10분, 길게는 30분이면 충분하다. 이처럼 초음파검사는 간편할 뿐만 아니라, 별다른 고통 없이 여러 질병을 진단할 수 있다.

• Journal of the Korean Society of Radiology
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• v.16 no.3
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• pp.265-271
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• 2022

This study retrospectively analyzed the test results of 441 patients who visited Hospital I in Busan from October 2021 to December 2021 and conducted both mid-term ultrasound and fibroscan tests. The purpose of the study was to investigate the usefulness of fibroscan in inter-fat evaluation by conducting correlation analysis and chi-squared test of inter-fat evaluation using liver ultrasound and fibroscan. As a result of analyzing the correlation between the fatty liver reading result of abdominal ultrasound and Fibroscan UAP, the correlation was found to be r=0.600 and p=0.000. In the inter-provincial evaluation, Fibroscan showed high validity in predicting objective results using inter-provincial values.