• Journal of IKEEE
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• v.26 no.1
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• pp.27-35
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• 2022

This paper proposes an ultrasound vessel-pattern imaging algorithm with low computational complexity. The proposed imaging algorithm reconstructs blood-vessel patterns by only detecting blood flow, and can be applied to a real-time signal processing hardware that extracts an ultrasonic finger-vessel pattern. Unlike a blood-flow imaging mode of typical ultrasound medical imaging device, the proposed imaging algorithm only reconstructs a presence of blood flow as an image. That is, since the proposed algorithm does not use an I/Q demodulation and detects a presence of blood flow by accumulating an absolute value of the clutter-filter output, a structure of the algorithm is relatively simple. To verify a complexity of the proposed algorithm, a simulation model for finger vessel was implemented using Field-II program. Through the behavioral simulation, it was confirmed that the processing time of the proposed algorithm is around 54 times less than that of the typical color-flow mode. Considering the required main building blocks and the amount of computation, the proposed algorithm is simple to implement in hardware such as an FPGA and an ASIC.

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.9
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• pp.99-109
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• 2016

This paper presents a method for generating spatiotemporal images to detect the leukocyte motions in a microvessel. By using the constraint that the leukocytes move along the contour line of a blood vessel wall, the method detects leukocyte motions and then generates spatiotemporal images. the translational motion by a movement in vivo is removed first by the template matching method. Next, a blood vessel region is detected by the automatic threshold selection method to binarize the temporal variance image, then a blood vessel wall's contour is expressed by B-spline function. With the detected blood vessel wall's contour as an initial curve, the plasma layer of the best accurate position is determined to be the spatial axis by snake. Finally, the spatiotemporal images are generated. The experimental results show the spatiotemporal images are generated effectively through the comparison of each step of three image sequences.

• Journal of the Korean Society of Radiology
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• v.84 no.4
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• pp.792-808
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• 2023

Trauma to the head and neck region can have serious consequences for vital organs such as the brain, and injuries to blood vessels can cause permanent neurological damage or even death. Thus, prompt treatment of head and neck vessels is crucial. Although the level of evidence is moderate, an increasing amount of research indicates that endovascular treatments can be a viable alternative to traditional surgery or medical management. Embolization or reconstructive endovascular procedures can significantly improve patient outcomes. This article provides an overview of various endovascular options available for specific clinical scenarios, along with examples of cases in which they were employed.

• The Korean Journal of Nuclear Medicine
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• v.33 no.6
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• pp.475-483
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• 1999

Purpose: Complete fibrovascular ingrowth within the hydroxyapatite ocular implant is necessary for peg drilling which is performed to Prevent infection and to provide motility to the ocular prosthesis. We compared planar bone scintigraphy and SPECT for the evaluation of the vascularization within hydroxyapatite ocular implants. Materials and Methods: Seventeen patients (M:F: 12:5, mean age; $50.4{\pm}17.5$ years) who had received a coralline hydroxyapatite ocular implant after enucleation surgery were enrolled. Patients underwent Tc-99m MDP planar bone and SPECT imaging by dual head gamma camera after their implant surgery (interval: $197{\pm}81$ days). Uptake on planar and SPECT images was graded visually as less than (grade 1), equal to (grade 2), and greater than (grade 3) nasal bridge activity. Quantitative ratio of implanted to non-implanted intraorbital activity was also measured. Vascularization within hydroxyapatite implants was confirmed by slit lamp examination and ocular movement. Results: All but three patients were considered to be vascularized within hydroxyapatite implants. In visual analysis of planar image and SPECT, grade 1 was noted in 9/18 (50%) and 6/18 (33%), respectively. Grade 2 pattern was 7/18 (39%) and 4/18 (22%), and grade 3 pattern was 2/18 (11%) and 8/18 (44%) respectively. When grade 2 or 3 was considered to be positive for vascularization, the sensitivity of planar and SPECT imaging were 60% (9/15) and 80% (12/15), respectively. In 3 patients with incomplete vascularization, both planar and SPECT showed grade 1 uptake The orbital activity ratios on planar imaging were not significantly different between complete and incomplete vascularization ($1.96{\pm}0.87$ vs $1.17{\pm}0.08$, p>0.05), however, it was significantly higher on SPECT in patients with complete vascularization ($8.44{\pm}5.45$ vs $2.20{\pm}0.87$, p<0.05). Conclusion: In the assessment of fibrovascular ingrowth within ocular implants by Tc-99m MDP bone scintigraphy, SPECT image appears to be more effective than planar scintigraphy.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.1637-1640
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• 2004

관상동맥 폐색증 환자들에 대해서 시술되는 stent 삽입 시술이나 관상동맥 우회로 시술 중에는 X-ray 등의 조영 영상이 시술의 기준이 되고 있다. 따라서 조영 영상에서 혈관을 빠르게 인식하는 것은 정확하고 효과적인 시술의 필수 조건이다. 이러한 시술 중 빠르고 정확한 혈관 인식을 위하여 본 논문에서는 심혈관 조영 영상으로부터 관상동맥의 형태를 자동적으로 영상분할하기 위한 방법을 제안한다. 우선 조영 영상에서 혈관을 분명하게 인식하기 위해서는 잡음을 제거하기 위한 필터링이 필요한 데, Anisotropic diffusion을 이용한 필터링은 이미지 내 물체의 경계선을 보존하고, 영역 내의 잡음을 제거하는 데 효과적이다. 정확한 영상분할을 수행하기 위해서는 대부분의 경우 사용자가 영상 내에 관심 영역을 지정하는 인터렉션이 필요하지만 이는 사용자에게 불편함을 줄 수 있다. 따라서 이러한 번거로움을 최소화하고, 정확한 결과를 유도하기 위해서 자동 씨드 영역 추출 알고리즘을 제안한다. 따라서 조영 영상에 필터링을 적용한 후 추출된 씨드 영역과 추출된 에지와 Adaptive region-growing을 복합적으로 사용하는 영상분할을 수행하게 되면 보다 효과적인 관상동맥 영상 분할의 결과를 얻을 수 있었다.

• Proceedings of the KSMRM Conference
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• 1999.11a
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• pp.17-18
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• 1999

최근까지 복부 자기공명영상은 간의 국소병변의 특성을 규명하는 데 가장 많이 사용되어 왔다고 할 수 있다. 그러나, 자기공명영상의 기법과 장비의 발달로 인해 그 적응증이 더욱 확대되어 가는 추세에 있고 , 특히 자기공명담췌관촬영술의 도입과 발전은 복부 자기공명영상의 적응증을 한층 넓히는 데 크게 기여하고 있다. 이와 함께, 2차원 또는 3차원 경사에코기법과 조영제를 병용하여 호흡정지 상태에서 자기공명혈관촬영상을 얻을 수 있게 되어 자기공명담췌관촬영술과 혈관촬영술을 복합하여 다양한 담췌관질환을 평가하는 데 이용하는 빈도가 증가하고 있다. 이 강의 에서는 최근에 널리 사용되는 자기공명담췌혈관촬영술 또는 역동적 역상과의 복합적 사용의 유용성을 돌아보고자 한다.

• Journal of the Korean Institute of Telematics and Electronics
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• v.22 no.3
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• pp.48-53
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• 1985

A real time digital subtraction angiographic system (RTDSA) was developed and utilized for diagnosis of the diseases related with the blood vessel conditions in 200 patients. In this paper, we present the system configurations and the real time processed images of the patients'abdominal, renal, femoral, and hepatic arteries.

• Journal of the Korean Society of Radiology
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• v.79 no.6
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• pp.311-314
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• 2018

Cavernous hemangioma of the breast is a rare benign vascular tumor. It is usually diagnosed as non-palpable mass during imaging examination, incidentally. Common sonographic finding of the breast hemangioma is a superficially located, oval shape, circumscribed margin mass. But the appearance of breast hemangioma is variable and it can be difficult to diagnose in preoperatively. Here, we report a 68-year-old female case with palpable breast mass and increased size on follow up ultrasonography.

• Proceedings of the Korea Contents Association Conference
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• 2011.05a
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• pp.525-526
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• 2011

복부 MRI 영상에서 간의 인식은 간에 존재하는 질병을 파악하는 것뿐만 아니라 간에 대한 치료 방법이나 수술 방법을 결정하는 중요한 정보를 제공한다. 따라서 본 논문은 복부 MRI 영상에서 이러한 간 영역과 간의 혈관을 자동으로 검출하는 알고리즘을 제안한다. 제안 알고리즘은 1단계로 Region Growing의 개선된 방법으로 초기 설정된 간 영역의 외곽선 정보를 이용하여 씨앗점을 설정해 간 영역을 초기 분할한다. 2단계로 분할된 영역 경계선의 지역적 최소값을 이용하여 경계선의 보정 작업을 수행한다. 이후 3단계로 추출된 간 영역을 기반으로 영상 개선 후, 인페인팅(In-painting) 기법을 활용하여 간 영역 내부의 혈관 부분을 검출하게 된다. 제안 알고리즘의 평가는 전문의의 수작업 결과와 비교하였고, 결과 82.5%의 평균 정확도를 보여 제안 알고리즘의 효과적인 간혈관 검출을 확인하였다. 향후 본 연구의 확장으로 검출된 혈관 영역의 3D Volume Rendering 연구를 수행할 예정이다.

• Journal of the Korean Society of Radiology
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• v.84 no.5
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• pp.1140-1145
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• 2023

Cerebral amyloid angiopathy-related inflammation (CAA-RI) is an encephalopathy caused by inflammation of β-amyloid peptide deposition in cerebrovascular vessels. It is a rare disease that mainly occurs in the elderly and is characterized by rapidly progressive dementia, headache, seizures, and focal neurologic deficits. CAA-RI can demonstrate characteristic brain MRI findings and can be reversed by steroids or other immunosuppressive therapies. Here, we report a case of CAA-RI, which was initially misdiagnosed as a subacute infarction but was diagnosed while reviewing follow-up brain MRI images, and spontaneous remission was achieved.