• Proceedings of the Korean Society of Radiological Science
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• 1995.05a
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• pp.126-128
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• 1995

• Proceedings of the Korean Society of Radiological Science
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• 1995.05a
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• pp.121-121
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• 1995

• Proceedings of the Korean Society of Radiological Science
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• 1994.05a
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• pp.9-9
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• 1994

• The monthly packaging world
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• no.6 s.182
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• pp.86-89
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• 2008

• Radioisotope journal
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• v.18 no.4
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• pp.112-120
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• 2003

• Journal of the Korea Institute of Information and Communication Engineering
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• v.21 no.1
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• pp.137-143
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• 2017

X-ray image is a widely used to medical examination, airport security and cargo inspection. However, X-ray images contain many visual noise, which interrupt image analysis. Consequently, it is primary importance to reduce noises of X-ray image. In this paper, we present a improved denoise technique for x-ray image using pixel value and range weights. First, we denoise a x-ray image using bilateral filter. Next, we detect a edge region of the original x-ray image. If a denoised pixel belongs to the edge region, we calculate weighting values of original x-ray image and denoised x-ray image in $3{\times}3$ neighboring pixels and compute the cost value to determine the boundary pixel value. Finally, the pixel value having minimum cost is determined as the pixel value of the denoised x-ray image. Simulation results show that the proposed algorithm achieves good performance in terns of PSNR comparison and subjective visual quality.

• Journal of the Korean Society for Precision Engineering
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• v.20 no.11
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• pp.32-40
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• 2003

• 건강소식
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• v.35 no.6
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• pp.16-17
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• 2011

음식물을 받아들여 소화하는 위장. 최대 1,500ml 정도까지 커지는 위장은 식도와 연결된 분문으로 음식물을 받아 소화시키고 잠시 저장한 뒤 유문을 통해 십이지장으로 내려보낸다. 중요한 역할을 하는 만큼 이상이 생기면 소화 불량, 더부룩함, 배탈, 속 쓰림, 설사 등 여러 증상으로 SOS신호를 보내는데, 이 같은 경고를 쉽게 무시해 버리는 게 문제다. 특히 위암은 조기에 발견하면 90% 이상 완치될 수 있으므로 정기적으로 위장을 검사해야 한다. 내시경을 넣는 위내시경검사, 조영제를 마시고 X선 촬영을 진행하는 조영촬영검사가 대표적이다.

• Journal of the Korean Society for Nondestructive Testing
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• v.14 no.3
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• pp.177-184
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• 1994

The three dimensional measuring method with minimizing operational errors for the arbitrary shaped-internal cavity based on the information of the X-ray nondestructive test is presented. Two experimental tests using artificial cavities were considered in order to verify the availity of PEVACA. In these test, X-ray NDT was conducted for detecting cavities, and the comparion between the calculating values from PEVACA and the real values from measuring the cavities was performed. As a result of this study, three dimensional cavities information using PEVACA are in good agreement with the real measured values within ${\pm}0.5mm$. The computer code, "PEVACA", contributes not only to improvement of data accuracy but also to saving of the work time and data documentation.

• Journal of radiological science and technology
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• v.38 no.1
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• pp.1-6
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• 2015

Whole spine scanography (WSS) is a radiological examination that exposes the whole body of the individual being examined to x-ray radiation. WSS is often repeated during the treatment period, which results in a much greater radiation exposure than that in routine x-ray examinations. The aims of the current study were to evaluate the patient dose of WSS using computer simulation, image magnification and angulation of phantom image using different patient position. We evaluated the effective dose(ED) of 23 consecutive patients (M : F = 13:10) who underwent WSS, based on the automatic image pasting method for multiple exposure digital radiography. The Anterior-Posterior position(AP) and Posterior-Anterior position( PA) projection EDs were evaluated based on the PC based Monte Carlo simulation. We measured spine transverse process distance and angulation using DICOM measurement. For all patient, the average ED was 0.069 mSv for AP position and 0.0361 mSv for PA position. AP position calculated double exposure then PA position. For male patient, the average ED was 0.089 mSv(AP) and 0.050 mSv(PA). For female patient, the average ED was 0.0431 mSv(AP) and 0.026 mSv(PA). The transverse process of PA spine image measured 5% higher than AP but angulation of transverse process was no significant differences. In clinical practice, just by change the patient position was conformed to reduce the ED of patient. Therefor we need to redefine of protocol for digital radiography such as WSS. whole spine scanography, effective dose, patient exposure dose, exposure direction. protocol optimization.