• Tuberculosis and Respiratory Diseases
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• 제57권6호
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• pp.515-521
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• 2004

With the increasing resolution of modern CT scanners, analysis of the larger numbers of images acquired in a lung screening exam or diagnostic study is necessary, which also needs high accuracy and reproducibility. Recent developments in the computerized analysis of medical images are expected to aid radiologists and other healthcare professional in various diagnostic tasks of medical image interpretation. This article is to provide a brief overview of some of computer-aided diagnosis schemes in chest CT.

• Journal of Korean Neurosurgical Society
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• 제37권1호
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• pp.59-62
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• 2005

We describe two cases of tension pneumocephalus, one caused by ventriculoperitoneal shunt for communicating hydrocephalus, and the other caused by craniocerebral trauma. In the first case report, we examined the relationship between cerebrospinal fluid leakage and delayed onset tension pneumocephalus. The second case report, we addressed issues such as the diagnosis, management, and pathogenesis, as well as computerized tomography(CT) findings.

• Journal of Chest Surgery
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• 제22권2호
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• pp.357-363
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• 1989

We experienced very rare case of pulmonary blastoma in a 5 year old girl. She complained of right chest pain and productive cough for 3 months. With computerized tomography and echocardiography it is disclosed that huge mediastinal solid tumor is occupied to whole right thoracic cavity and compressed mediastinal structures to left and extended to left atrium. We removed the thoracic tumor and its extended intracardiac portion completely using the technique of intrapericardial pneumonectomy with cardiopulmonary bypass. Postoperatively the patient recovered without any problem and received adjuvant chemotherapy and radiotherapy. But she was succumbed 2 months later because of opportunistic pulmonary infection with pneumocystis carinii.

• 대한예방의학회:학술대회논문집
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• 대한예방의학회 1996년도 제48차 추계 학술대회 연제집
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• pp.349-350
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• 1996

• 한국광학회:학술대회논문집
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• 한국광학회 2001년도 제12회 정기총회 및 01년도 동계학술발표회
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• pp.270-271
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• 2001

안과 실명 질환의 가장 많은 부분을 차지하는 안구 망막의 실시간 3차원 계측기술은 아직 초보단계에 머물고 있다. 다른 장기나 조직에 비해 3차원계측기술이 늦어진 몇 가지 이유를 들면 다음과 같다. 첫째, 망막이 150$\mu$에서 400$\mu$의 얇은 막이어서 기존의 초음파(ultrasonography), CT(computerized tomography)나 MRI(magnetic resonance image)의 해상력으로는 영상화되지 않는다. 둘째로는 망막이 안구내의 뒤쪽에 위치하여 오직 동공을 통해서만 관찰 가능하여 3차원이 영상화가 어렵다. (중략)

• Journal of Astronomy and Space Sciences
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• 제34권1호
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• pp.7-17
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• 2017

In South Korea, there are about 80 Global Positioning System (GPS) monitoring stations providing total electron content (TEC) every 10 min, which can be accessed through Korea Astronomy and Space Science Institute (KASI) for scientific use. We applied the computerized ionospheric tomography (CIT) algorithm to the TEC dataset from this GPS network for monitoring the regional ionosphere over South Korea. The algorithm utilizes multiplicative algebraic reconstruction technique (MART) with an initial condition of the latest International Reference Ionosphere-2016 model (IRI-2016). In order to reduce the number of unknown variables, the vertical profiles of electron density are expressed with a linear combination of empirical orthonormal functions (EOFs) that were derived from the IRI empirical profiles. Although the number of receiver sites is much smaller than that of Japan, the CIT algorithm yielded reasonable structure of the ionosphere over South Korea. We verified the CIT results with NmF2 from ionosondes in Icheon and Jeju and also with GPS TEC at the center of South Korea. In addition, the total time required for CIT calculation was only about 5 min, enabling the exploration of the vertical ionospheric structure in near real time.

• Asian Pacific Journal of Cancer Prevention
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• 제16권14호
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• pp.5599-5605
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• 2015

In oncology various imaging modalities play a crucial role in diagnosis, staging, restaging, treatment monitoring and follow up of various cancers. Stand-alone morphological imaging like computerized tomography (CT) and magnetic resonance imaging (MRI) provide a high magnitude of anatomical details about the tumor but are relatively dumb about tumor physiology. Stand-alone functional imaging like positron emission tomography (PET) and single photon emission tomography (SPECT) are rich in functional information but provide little insight into tumor morphology. Introduction of first hybrid modality PET/CT is the one of the most successful stories of current century which has revolutionized patient care in oncology due to its high diagnostic accuracy. Spurred on by this success, more hybrid imaging modalities like SPECT/CT and PET/MR were introduced. It is the time to explore the potential applications of the existing hybrid modalities, developing and implementing standardized imaging protocols and train users in nuclear medicine and radiology. In this review we discuss three existing hybrid modalities with emphasis on their technical aspects and clinical applications in oncology.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제34권5호
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• pp.555-561
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• 2008

Purpose: The goal of this study was to develop a technique for creating a computerized composite maxillofacial-dental model, based on point-based surface best fit algorithm and to test its accuracy. The computerized composite maxillofacial-dental model was made by the three dimensional combination of a 3-dimensional (3D) computed tomography (CT) bone model with digital dental model. Materials and Methods: This integration procedure mainly consists of following steps : 1) a reconstruction of a virtual skull and digital dental model from CT and laser scanned dental model ; 2) an incorporation of dental model into virtual maxillofacial-dental model by point-based surface best fit algorithm; 3) an assessment of the accuracy of incorporation. To test this system, CTs and dental models from 3 volunteers with cranio-maxillofacial deformities were obtained. And the registration accuracy was determined by the root mean squared distance between the corresponding reference points in a set of 2 images. Results and Conclusions: Fusion error for the maxillofacial 3D CT model with the digital dental model ranged between 0.1 and 0.3 mm with mean of 0.2 mm. The range of errors were similar to those reported elsewhere with the fiducial markers. So this study confirmed the feasibility and accuracy of combining digital dental model and 3D CT maxillofacial model. And this technique seemed to be easier for us that its clinical applicability can good in the field of digital cranio-maxillofacial surgery.

• 대한치과보철학회지
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• 제56권2호
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• pp.126-133
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• 2018

Cone beam computerized tomography (CBCT)의 발전은 환자의 해부학적 구조를 3차원적으로 분석할 수 있게 하였다. Surgical guide는 CBCT와 CAD/CAM, 임플란트 진단 소프트웨어의 접목을 통해 미래의 보철물을 계획하고 적합한 위치에 임플란트를 식립할 수 있게 한다. Guided surgery를 통해 해부학적 구조물에 대한 침범을 최소한으로 줄일 수 있고 보다 재현성 있는 치료계획의 설정이 가능하다. 본 증례는 전악 무치악 환자에게 surgical guide를 이용하여 다수의 임플란트를 식립한 증례로 수술시간을 단축시킬 수 있었으며 임시 보철물을 미리 제작함으로써 보다 쉽게 immediate loading을 시행할 수 있었다. 환자는 개선된 안모와 저작기능에 만족하였다.

• 한국병원경영학회지
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• 제3권1호
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• pp.121-133
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• 1998

We analyzed volume changes in the computerized tomography(CT) and the magnetic resonance imaging(MRI) utilizations. These two volumes are comparative because CT has been covered by the Medical Insurance from the beginning of 1996, however, MRI has not been covered up to now. We investigated 80 hospitals which afforded a facility of CT by the end of 1994. For the comparison of CT utilization, we selected two periods. The first period was from January to June of 1995, in which CT had not been covered by the Medical Insurance and the second period was from January to June of 1966, in which CT had been covered. The information we obtained were characteristics of hospitals, patients numbers per month, monthly uses of CT and MRI, and payments of CT claims, etc. After the Medical Insurance coverage, the number of CT uses per 1,000 patients were increased from January to March, however, was decreased from April to June in 1996 compared to the same periods of 1995. the number of CT uses in clinics were large than those in tertiary hospitals. The number of CT uses in small cities were larger than those in big cities. On the other hand, the number of MRI uses per 1,000 patients did not changed from January to May and was increased from June in 1996 compared to the same periods of 1995. These results showed the substitutional relationship of CT and MRI uses. After the insurance coverage for CT, the utilization of CT was increased because patients payed less than before. However, insurers restricted the payments to the CT claims. This impact might explain the substitutional relationship between CT and MRI.