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Abdominal aortic aneurysm in giant cell arteritis
Hyunwook Kwon,Youngjin Han,Da Hye Son,Yong-Pil Cho,Tae-Won Kwon 대한외과학회 2015 Annals of Surgical Treatment and Research(ASRT) Vol.89 No.4
Aortic complications of giant cell arteritis are a rare cause of abdominal aortic aneurysm. Here, we describe a case of a ruptured aortic aneurysm in a patient with giant call arteritis (GCA) who was preoperatively suspected of having an infectious aortic aneurysm. Intraoperative inspection revealed infectious granulation tissue on the anterior wall of the abdominal aorta. GCA was finally confirmed by pathological diagnosis. Our findings suggest that the surgical and postoperative treatment of nonatheromatous aortic aneurysm should be based on accurate diagnosis.
Hyojeong Kwon,Hyunwook Kwon,Joon Pio Hong,Youngjin Han,Hojong Park,Gi-Won Song,Tae-Won Kwon,Yong-Pil Cho 대한외과학회 2015 Annals of Surgical Treatment and Research(ASRT) Vol.89 No.1
Major peripheral arterial graft infection is a potentially devastating complication of vascular surgery, associated with significant mortality and high amputation rates. Autologous saphenous veins are considered optimal arterial conduits for lower extremity revascularization in infected fields, but they are often unavailable or unsuitable in these patients. This study describes two patients with major peripheral graft infection, but without available autologous veins, who underwent graft excision and cryopreserved cadaveric arterial allograft reconstruction. Although long-term graft durability is unclear because of gradual deterioration and degeneration, these findings suggest that cadaveric allografts may be good options for patients with major peripheral graft infection.
Clinical outcomes of staged bilateral carotid endarterectomy for bilateral carotid artery stenosis
Amy Kim,Tae-Won Kwon,Youngjin Han,Sun U. Kwon,Hyunwook Kwon,Minsu Noh,Yong-Pil Cho 대한외과학회 2015 Annals of Surgical Treatment and Research(ASRT) Vol.89 No.5
Purpose: This retrospective cohort study aimed to determine the clinical outcomes of staged bilateral carotid endarterectomy (CEA) for bilateral internal carotid artery (ICA) stenosis performed with a short interval between the primary and secondary CEA procedures. Methods: In our institution, 574 consecutive patients underwent CEA between September 2007 and August 2014. Bilateral significant ICA stenosis was identified in 43 patients (7.5%) who underwent staged bilateral CEA within 30 days or less. Patients with unilateral CEA and staged bilateral CEA were compared in terms of CEA outcomes. The primary endpoint was the composite of any stroke, myocardial infarction, or death during the periprocedural period or ipsilateral stroke within 3 years after the CEA. Results: Staged bilateral CEA was not associated with ipsilateral stroke (P = 0.178) during postoperative follow-up. The two groups did not differ in terms of estimated 3-year primary endpoint rates (2.8% vs. 4.7%, P = 0.456) or ipsilateral strokefree (P = 0.225), any stroke-free (P = 0.326), or overall (P = 0.739) survival rates. Conclusion: Patients with bilateral significant ICA stenosis can undergo staged bilateral CEA within 30 days or less with outcomes that compare favorably with those of patients undergoing unilateral CEA.
Kwon, Min Jeong,Hahn, Jooyoung,Park, HyunWook Wiley Subscription Services, Inc., A Wiley Company 2008 INTERNATIONAL JOURNAL OF IMAGING SYSTEMS AND TECHN Vol.18 No.1
<P>The convoluted shape of the cerebral cortex makes it difficult to analyze and visualize the neuronal activation area. One way of overcoming this problem is to use a spherical inflation method to draw a cerebral cortex on a spherical surface. The task of mapping the cortical surface on a sphere has several obstacles, namely, the overlap between the polygons of the surface, the heavy computation demand, and the geometric distortions inherent in the process. This article proposes a method of mapping the three-dimensional (3D) cortical surface represented in a simplex mesh to a sphere surface, which does not have any overlap between the polygons and minimizes the geometric distortions as well as the computation time. The proposed method consists of the two steps of preprocessing and refinement. In the preprocessing step, the 3D cortical surface is mapped onto a sphere without any overlap between the polygons by iterative deformation. In the refinement step, the mapped surface is adjusted to minimize its linear distortion. The experimental results show the efficiency and performance of the proposed mapping method. © 2008 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 18, 9–16, 2008</P>
A parallel MR imaging method using multilayer perceptron
Kwon, Kinam,Kim, Dongchan,Park, HyunWook Wiley (John WileySons) 2017 Medical physics Vol.44 No.12
<P>Conclusion: We have proposed a reconstruction method using machine learning to accelerate imaging time, which reconstructs high-quality images from subsampled k-space data. It shows flexibility in the use of k-space sampling patterns, and can reconstruct images in real time. (C) 2017 American Association of Physicists in Medicine</P>