• Proceedings of the Korean Information Science Society Conference
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• 1999.10b
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• pp.425-427
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• 1999

본 논문에서는 시간 간격을 두고 활영한 흉부의 단순 x선 영상의 차영상을 이용하여 컴퓨터 도움 진단에 활용할 수 있는 방법에 대해 연구하였다. 시간 간격을 두고 촬영한 흉부 단순 x선 영상의 차영상은 시간에 따른 변화를 명확히 보여줌으로써 질병의 조기진단 및 질병의 전개과정 등을 알아보는데 유용하게 쓰일 수 있다. 특히, 이 방법은 폐암과 같이 조기진단이 매우 어려운 질병에 대하여 정기검진 등에서 정기적으로 촬영한 단순 x선 영상을 이용하여 조기진단을 할 수 있는 방법으로 활용될 수 있다. 그러나, 촬영시의 여러 가지 조건들, x선의 세기와 조영시간, 환자의 촬영 자세 및 호흡 상태 등에 따라 단순 x선 영상이 크게 달라져 단순한 뺄셈에 의한 차영상은 진단에 도움이 되지 못한다. 진단에 도움을 주기 위해서는 두 영상 사이의 전체적인 밝기와 대조도를 맞추고 늑골, 쇄골 등 해부학적 구조물의 위치와 크기를 서로 맞추어 차영상을 얻는 영상처리 방법이 필요하다. 또한, 폐의 크기와 위치도 서로 맞추어 차영상을 얻어야 한다. 그러나, 이러한 방법도 늑골과 폐의 크기와 위치 변화가 서로 일치하지 않는 문제점을 가지고 있다. 본 논문에서는 이러한 영상처리를 통하여 차영상을 얻는 방법에 대하여 논하고 방법상의 문제점과 해결 방법을 제시한다.

• The KIPS Transactions:PartB
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• v.16B no.2
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• pp.165-172
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• 2009

According to the American Cancer Society, breast cancer is the second largest cause of cancer deaths and most frequently diagnosed cancer in women. The currently most popular method for early detection of breast cancer is the digital mammography. A mass or calcification lesion has been known as the most important clue for the diagnosis. In this paper, we propose a diagnosis approach based on fuzzy cluster knowledge base. We combine different two sources of feature data in duel OFUN-NET and produce the diagnosis result with possibility degree. We also present the experimental results on the dataset of mass and calcification lesions extracted from the public real world mammogram database DDSM. These results show higher classification accuracy than conventional methods and the feasibility as a decision supporting tool for diagnosis of digital mammogram.

• Journal of Korea Multimedia Society
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• v.8 no.4
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• pp.482-491
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• 2005

In this paper, we proposed the microcalcification detection algorithm which is based on wavelet transform and automatic thresholding method in the X-ray mammographic images. Digital X-ray imaging system is essential equipment in the field diagnosis and is widely used in the various fields such as chest, fracture of a bone, and dental correction. Especially, digital X-ray mammographic imaging is known as the most important method to diagnose the breast cancer, many researches to develop the imaging system are processing in country. In this paper, we proposed a microcalcifications detection algorithm necessary in the early phase of breast cancer diagnosis and showed that a algorithm could effectively detect microcalfication and could aid diagnosis-radiologist.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.1
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• pp.413-419
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• 2011

Diagnosis X-ray equipment localized at 1950's but it is developed suddenly at 1960's with demand together. Manufacture of Diagnostic X-ray equipment is controled by the KS regulation and the Ministry of Health and Welfare because of hazardous element etc. exposure by radiation. Most of diagnostic X-ray equipment ware single phase and three phase full-wave rectification but from 1980's it transforms it was exchanged in inverter type X-ray equipment. Inverter type X-ray equipment produces approximately 50~80% more average photon intensity then single phase full-wave rectification and the accuracy is high. But from a clinic it dose not use because expensive therefor the efficiency improvement of single phase full-wave rectification is necessary. We produced single phase full-wave rectification X-ray equipment control unit, high tension transformer, filament heating transformer, rectification circuit, high tension cable and others and evaluated efficiency, in result which is excellent compare with Rule of Safety Management and KS regulation.

• 전기의세계
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• v.38 no.8
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• pp.4-8
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• 1989

C.T의 출현은 그때까지의 X선 영상법이 3차원적 물체를 오차원적 영상으로 투영한 방법인데 반하여, 3차원 물체의 단면을 선택하여 2차원적 영상을 그대로 영상화하는 새로운 형태의 획기적인 방법으로 환자의 진단에 크게 공헌하고 있다. C.T의 기술은 급속하에 발전되어 현재 거의 기술정착단계에 도달했다고 할 수 있다. 이러한 C.T의 발전은 X선을 이용한 디지탈 영상진단 장치의 발전은 여러가지 형태로 나타나고 있다.

• Tuberculosis and Respiratory Diseases
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• v.43 no.3
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• pp.388-402
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• 1996

Background : To compare the diagnostic accuracies of High-resolution CT(HRCI) and chest radiography in the diagnosis of diffuse infiltrative lung disease(DILD). Methods : This study included ninety-nine patients with a diagnosis of acute or chronic DILD, representing 20 different diseases. Twelve normal subjects were included as control. The disease state was confirmed either pathologically or clinically. Radiographs and CT scans were evaluated separately by three independent observers without knowledge of clinical and pathologic results. The observers listed three most likely diagnoses and recorded degree of confidence. Results : The sensitivity of HRCT in the detection of DILD was 98.9% compared to 97.9% of chest radiography. Overall, a correct first-choice diagnosis was made in 48% using chest radiographs and in 60% using HRCT images. The correct diagnosis was among the top-three choices in 64% when chest radiographs were used, and in 75% when HRCT images were reviewed. Overally a confident diagnosis was reached more often with HRCT(55%) than with chest radiography(26%). The correct first-choice diagnosis increased remarkably when the HRCT was used in usual interstitial pneumonia, miliary tuberculosis, diffuse panbronchiolitis and lymphangitic carcinomatosis. Conclusion : HRCT is confirmed to be superior to conventional radiography in the detection and accurate diagnosis of DILD. HRCT is especially valuable in the diagnosis of usual interstitial pneumonia, miliary tuberculosis, diffuse panbronchiolitis, and lymphangitic carcinomatosis.

• Journal of Radiation Protection and Research
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• v.27 no.3
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• pp.155-164
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• 2002

Methodology to evaluate the effective doses to adults undergoing various diagnostic x-ray examinations were established by Monte Carlo simulation of the x-ray examinations. Anthropomorphic mathematical phantoms, the MIRD5 male phantom and the ORNL female phantom, were used as the target body and x-ray spectra were produced by the x-ray spectrum generation code SPEC78. The computational procedure was validated by comparing the resulting doses to the results of NRPB studies for the same diagnostic procedures. The effective doses as well as the organ doses due to chest, abdomen, head and spine examinations were calculated for x-rays incident from AP, PA, LLAT and RLAT directions. For instance, the effective doses from the most common procedures, chest PA and abdomen AP, were 0.029 mSv and 0.44 mSv, respectively. The fact that the effective dose from PA chest x-ray is far lower than the traditional value of 0.3 mSv(or 30 mrem), which results partly from the advances of technology in diagnostic radiology and partly from the differences in the dose concept employed, emphasizes necessities of intensive assessment of the patient doses in wide ranges of medical exposures. The methodology and tools established in this study can easily be applied to dose assessments for other radiology procedures; dose from CT examinations, dose to the fetus due to examinations of pregnant women, dose from pediatric radiology.

• 건강소식
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• v.35 no.9
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• pp.16-17
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• 2011

원통형 장치가 달린 검사대에 눕는다. 검사대가 원통 안으로 이동하면 X선, 혹은 자기장이 발생해 검사를 진행한다. X선을 이용하는 CT검사는 5분남짓, 자기장을 이용하는 MRI검사는 30분 남짓 걸린다. 치료보다는 '진단'을 중시하는 요즘, CT나 MRI는 우리 몸 구석구석을 들여다보고 진단에 도움을 주는 일반적인 검사로 통하고 있다.

• Journal of Radiation Protection and Research
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• v.28 no.1
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• pp.35-42
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• 2003

Methodology for calculating the organ equivalent doses and the effective doses of pediatric and adult patients undergoing medical X-ray examinations were established. The MIRD-type mathematical phantoms of 4 age groups were constructed with addition of the esophagus to the same phantoms. Two typical examination procedures, chest PA and abdomen AP, were simulated for the pediatric patients as well as the adult as illustrative examples. The results confirmed that patients pick up approximate 0.03 mSv of effective dose from a single chest PA examination, and 0.4 to 1.7 mSv from an abdomen AP examination depending on the ages. For dose calculations where irradiation is made with a limited field, the details of the position, size and shape of the organs and the organ depth from the entrance surface considerably affect the resulting doses. Therefore, it is important to optimize radiation protection by control of X-ray properties and beam examination field. The calculation result, provided in this study, can be used to implement optimization for medical radiation protection.

• Journal of Veterinary Clinics
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• v.30 no.3
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• pp.193-195
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• 2013

An 18-month-old intact male Cocker Spaniel dog weighing 7.7 kg was referred with a 2-week history of severe regurgitation. Based on the screening examination and fluoroscopy, this patient was diagnosed as having esophageal dysmotility. Treatment with mosapride and feeding small amounts of canned food frequently in an elevated position resulted in a successful outcome. The severe regurgitation improved, and the esophageal transit time improved from 18 sec to 8 sec. This is the first case report describing the diagnosis and clinical management of esophageal dysmotility in a young dog in Korea.