• Journal of Korea Multimedia Society
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• v.13 no.7
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• pp.1044-1050
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• 2010

Endoscopic ultrasonography is a medical procedure in endoscopy combined with ultrasound to obtain images of the internal organs. It is useful to have a predictive pathological manifestation since a doctor can observe tumors under mucosa. However, it is often subjective to judge the degree of malignant degeneration of tumors. Thus, in this paper, we propose a feature analysis procedure to make the pathological manifestation more objective so as to improve the accuracy and recall of the diagnosis. In the process, we extract the ultrasound region from the image obtained by endoscopic ultrasonography. It is necessary to standardize the intensity of this region with the intensity of water region as a base since frequently found small intensity difference is only to be inefficient in the analysis. Then, we analyze the spot region with high echo and calcium deposited region by applying LVQ algorithm and bit plane partitioning procedure to tumor regions selected by medical expert. For detailed analysis, features such as intensity value, intensity information included within two random points chosen by medical expert in tumor region, and the slant of outline of tumor region in order to decide the degree of malignant degeneration. Such procedure is proven to be helpful for medical experts in tumor analysis.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.3236-3237
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• 2000

본 논문에서는 의료 영상분야에서 많이 활용되고 있는 기존의 영상 획득,저장 및 전송 시스템(PACS)에 스테레오 내시경 영상이 추가될 수 있도록 기존의 PACS에 스테레오 기능의 관찰(viewing) 시스템을 추가하였으며 기본 기능으로 1) 3차원 스테레오 좌,우 독립 영상의 선택과 합성 2) 기존의 합성된 스테레오 영상의 선택이 가능하도록 하였으며 3) 스테레오 영상의 Dicom 표준이 없는 상황을 고려하여 기본적인 카메라 관련 사항(카메라 사양, 초점 거리, 베이스라인 등)을 입력할 수 있는 기록 필드를 삽입하였다. 또한 임상적으로 수용 가능한 3차원 스테레오 영상의 PACS내 효율적 저장법을 제시하기 위하여 의료 영상에 많이 활용되는 JPEG과 Wavelet 압축법을 각각 이용하여 3차원 좌,우 독립영상과 복합 영상의 효율적 압축비를 PSNR을 중심으로 비교하였다.

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.390-397
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• 2009

Endoscopic ultrasonography is a medical procedure in endoscopy combined with ultrasound to obtain images of the internal organs. It is useful to have a predictive pathological manifestation since a doctor can observe tumors under mucosa. However, it is often subjective to judge the degree of malignant degeneration of tumors. Thus, in this paper, we propose a feature analysis procedure to make the pathological manifestation more objective so as to improve the accuracy and recall of the diagnosis. In the process, we extract the ultrasound region from the image obtained by endoscopic ultrasonography. It is necessary to standardize the intensity of this region with the intensity of water region as a base since frequently found small intensity difference is only to be inefficient in the analysis. Then, we analyze the spot region with high echo and calcium deposited region by applying LVQ algorithm and bit plane partitioning procedure to tumor regions selected by medical expert. For detailed analysis, features such as intensity value, intensity information included within two random points chosen by medical expert in tumor region, and the slant of outline of tumor region in order to decide the degree of malignant degeneration. Such procedure is proven to be helpful for medical experts in tumor analysis.

• Journal of Internet Computing and Services
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• v.16 no.1
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• pp.1-8
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• 2015

Ultra-wide-angle wireless endoscopes are demonstrated in this paper. The endoscope is composed of an ultra-wide-angle camera module and wireless transmission module. A lens unit with the ultra-wide FOV of 162 degrees is designed and manufactured. The lens, image sensor, and camera processor unit are packaged together in a $3{\times}3{\times}9-cm3$ case. The wireless transmission modules are implemented based on UWB- and WiFi-based platform, respectively. The UWB-based module can transmit HD video to a computer in resolution of $2048{\times}1536$ (QXGA) and the frame rate of 15 fps in MJPEG compression mode. The maximum data transfer rate reaches 41.2 Mbps. The FOV and the resolution of the endoscope is comparable to a medical-grade endoscope. The FOV and resolution is ~3X and 16X higher than that of a commercial high-performance WiFi endoscope, respectively. The WiFi-based module streams out video to a smart device with th maximum date transfer rate of 1.5 Mbps at the resolution of $640{\times}480$ (VGA) and the frame rate of 30 fps in MJPEG compression mode. The implemented components show the feasibility of cheap medical-grade wireless electronic endoscopes, which can be effectively used in u-healthcare, emergency treatment, home-healthcare, remote diagnosis, etc.

• ICROS
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• v.8 no.2
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• pp.18-25
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• 2002

• Korean Journal of Optics and Photonics
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• v.30 no.6
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• pp.243-248
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• 2019

The respiratory tract is an essential part of the respiratory system involved in the process of respiration. However, if stenosis occurs, it interferes with breathing and can even lead to death. Asthma is a typical example of a reversible cause of airway narrowing, and the number of patients suffering from acute exacerbation is steadily increasing. Therefore, it is important to detect airway narrowing early and prevent the patient's condition from worsening. Optical coherence tomography (OCT), which has high resolution, is suitable for observing the microstructure of tissues. In this study we developed an endoscopic OCT system. We combined a 1300-nm OCT system with a servo motor, which can rotate at a high speed. A catheter was pulled back using a linear stage while imaging with 360° rotation by the motor. The motor was selected considering various requirements, such as torque, rotational speed, and gear ratio of pulleys. An ex vivo rabbit tracheal model was used as a sample, and the sample and catheter were immobilized by acrylic structures. The OCT images provided information about the structures of the mucosa and submucosa. The difference between normal and stenosed parts in the trachea was confirmed by OCT. Furthermore, through a three-dimensional (3-D) reconstruction process, it was possible to identify and diagnose the stenosis in the 3-D image of the airway, as well as the cross-sectional image. This study would be useful not only for diagnosing airway stenosis, but also for realizing 3-D imaging.

• Korean Journal of Optics and Photonics
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• v.25 no.2
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• pp.67-71
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• 2014

Intravascular optical coherence tomography (OCT) enables imaging of the three-dimensional (3D) microstructure of a blood vessel wall. While 3D vascular visualization provides detailed information of the vessel wall and intraluminal structures, a longitudinal imaging pitch that is several times bigger than the imaging resolution of the system has limited true high-resolution 3D imaging. In this paper we demonstrate high-speed intravascular OCT in vivo, acquiring images at a rate of 350 frames per second. A 47-mm-long rabbit aorta was imaged in 3.7 seconds, after a short flush with contrast agent. The longitudinal imaging pitch was 34 micrometers, comparable to the transverse imaging resolution of the system. Three-dimensional volume rendering showed greatly enhanced visualization of tissue microstructure and stent struts, relative to what is provided by conventional intravascular imaging speeds.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.1689-1691
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• 2015

인체 장기의 내부 구조를 학습하기 위해 많은 3 차원 인체영상관련 콘텐츠들이 소개되어 왔다. 하지만, 이러한 학습 콘텐츠들은 사실적인 색상을 표현하기 어려울 뿐만 아니라 사용자가 조작할 때 현실감이 떨어지기 때문에 해부도감과 같은 2 차원 학습 콘텐츠와 차별성이 적다. 본 논문에서는 사실적인 인체 색 정보를 가지고 있는 컬러 인체 데이터와 사용자의 동작을 인식하는 센서를 활용하여 몰입감 높은 체험형 가상 내시경 모의 훈련 시스템을 제안한다. 컬러 인체 데이터를 양안시 볼륨렌더링 하여 입체감을 높이고 동작인식 센서를 이용하여 사용자의 손동작으로 직접 가상 내시경 카메라를 조작하여 항행하도록 하였다. 제안한 시스템을 이용하여 다양한 인체 장기의 내부 구조를 사실적으로 표현할 수 있으며 이를 통해 의학정보 학습에 도움을 줄 수 있다.

• Korean Journal of Digital Imaging in Medicine
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• v.4 no.1
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• pp.58-61
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• 1998

현재 국내에서는 Virtual CT endoscopy가 초기단계에 있으므로 앞으로 많은 임상 경험과 data의 축적을 쌓는 것이 중요하다고 보여진다. Virtual CT endoscopy는 조직학적 검사를 위한 병변부위의 조직검사가 불가능한 단점을 갖고 있으나 내시경 검사와 거의 비슷한 소견을 얻을 수 있어 앞으로 병변의 진단 뿐 아니라 병변의 치료 후 추적 검사로도 유용하게 이용되리라 사료된다.

• Journal of the Korean Society of Radiology
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• v.85 no.3
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• pp.637-642
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• 2024

Rectal syphilis is a rare form of syphilis presentation and its symptoms, endoscopic and radiologic findings are nonspecific. Rectal syphilis typically presents with features such as concentric rectal wall thickening, mucosal hyperemia, perirectal fat stranding, and lymphadenopathy. Rectal cancer exhibits asymmetric wall thickening and lymph node necrosis, aiding in the differentiation between these two diseases. However, due to the considerable overlap in their respective manifestations, distinguishing between rectal syphilis and rectal cancer is extremely challenging without considering the patient's medical history. Rectal syphilis often leads to unnecessary tests or delayed treatment, as it can be mistaken for other benign diseases such as inflammatory bowel diseases in addition to rectal cancer. In this case report, we aim to provide a detailed report on the endoscopic, imaging, and pathological findings based on our experience with a case of suspected rectal malignancy that turned out to be rectal syphilis.