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51마리의 아니사키스 유충 제거 후 발생한 위와 대장의 점막하종양
조민형 ( Min Hyoung Cho ),이상진 ( Sang Jin Lee ),정형주 ( Hyoung Chu Joung ),강종원 ( Jong Won Kang ),이경원 ( Kyoung Won Lee ),김영돈 ( Young Don Kim ),천갑진 ( Gab Jin Cheon ) 대한내과학회 2012 대한내과학회지 Vol.82 No.4
A 60-year-old man visited the outpatient clinic complaining of spasmodic abdominal pain. The symptoms had started 4 days previously, within 1 hour of eating sliced raw flatfish (sashimi) and a piece of flatfish gut. Gastroscopy revealed generalized mucosal edema, erythema, multiple erosions, and numerous worms penetrating the gastric mucosa at the greater and lesser curvatures of the middle and lower corpora. Fifty-one worms, 0.5-3 cm in length, were successfully removed with biopsy forceps. Three weeks later, a normal mucosa-covered, 3.5-cm round submucosal tumor (SMT) was found on the greater curvature of the lower corpus and four yellowish, 1-cm SMTs were found on the hepatic flexure of the colon. Histopathological examination revealed marked eosinophilic infiltration in the gastric and colonic mucosa and an eosinophilic abscess in the submucosa. Here, we report a case of eosinophilic granuloma manifesting as SMTs in the stomach and colon after the endoscopic removal of a large number of anisakids. (Korean J Med 2012;82:453-458)
정형주 ( Hyoung Chu Joung ),한군희 ( Koon Hee Han ),조민형 ( Min Hyoung Cho ),이정화 ( Joung Hwa Lee ),정우진 ( Woo Jin Jeong ),김영돈 ( Young Don Kim ),이상진 ( Sang Jin Lee ),강종원 ( Jong Won Kang ),안재홍 ( Jae Hong Ahn ),강 대한내과학회 2011 대한내과학회지 Vol.80 No.2
Background/Aims: Stercoral colitis is an inflammatory condition related to increased intraluminal pressure, itself caused by impacted fecal material. Stercoral colitis is a rare condition and has a generally poor prognosis. The aims of this study were to investigate the clinical characteristics and outcomes of stercoral colitis according to management strategy. Methods: From January 2004 to August 2009, 11 patients were diagnosed with stercoral colitis at our center. The medical records of these individuals were reviewed retrospectively with regard to the clinical characteristics, management strategy, and clinical outcomes. We defined severe stercoral colitis as stercoral colitis complicated by systemic inflammatory response syndrome, sepsis, or septic shock. Results: Eleven patients (three men and eight women) with a mean age of 70±8 years were included. Ten patients were elderly with constipation as a predisposing factor. Nine patients had severe stercoral colitis according to out criteria. Of these, five patients underwent surgery, and the other four were treated with a conservative management strategy. One patient (20%) in the surgical group and all patients in the conservative management group (n=4) died. Conclusions: Stercoral colitis should be considered in elderly patients with predisposing factors and presents as fecal impaction with colonic wall thickening or pericolic fat stranding on CT scan. In patients with severe stercoral colitis, early surgery may be effective in reducing mortality. (Korean J Med 2011;80:187-192)
저자장 자기공명영상 시스템 내에서 초상자성 나노입자 온열치료를 위한 발열 평가
김기수,조민형,이수열,Kim, Ki Soo,Cho, Min Hyoung,Lee, Soo Yeol 대한의용생체공학회 2014 의공학회지 Vol.35 No.4
For the combination of MRI and magnetic particle hyperthermia(MPH), we investigated the relative heating efficiency with respect to the strength of the static magnetic field under which the magnetic nanoparticles are to be heated by RF magnetic field. We performed nanoparticle heating experiments at the fringe field of 3T MRI magnet with applying the RF magnetic field perpendicularly to the static magnetic field. The static field strengths were 0T, 0.1T, 0.2T, and 0.3T. To prevent the coil heat from conducting to the nanoparticle suspension, we cooled the heating solenoid coil with temperature-controlled water with applying heat insulators between the solenoid coil and the nanoparticle container. We observed significant decrease of heat generation, up to 6% at 0.3T(100% at 0T), due to the magnetic saturation of the nanoparticles of 15 nm diameter under the static field. We think MPH is still feasible at low magnetic field lower than 0.3T if stronger RF magnetic field generation is permitted.
Zoom-in Micro-tomography와 3차원 Fuzzy Distance Transform을 이용한 쥐 대퇴부의 해면골 두께 측정
박정진,조민형,이수열,Park, Jeong-Jin,Cho, Min-Hyoung,Lee, Soo-Yeol 대한의용생체공학회 2006 의공학회지 Vol.27 No.4
Micro computed tomography (micro-CT) has been used for in vivo animal study owing to its noninvasive and high spatial resolution capability. However, the sizes of existing detectors for micro-CT systems are too small to obtain whole-body images of a small animal object with $\sim$10 micron resolution and a part of its bones or other organs should be extracted. So, we have introduced the zoom-in micro-tomography technique which can obtain high-resolution images of a local region of an live animal object without extracting samples. In order to verify our zoom-in technique, we performed in vivo animal bone study. We prepared some SD (Sprague-Dawley) rats for making osteoporosis models. They were divided into control and ovariectomized groups. Again, the ovariectomized group is divided into two groups fed with normal food and with calcium-free food. And we took 3D tomographic images of their femurs with 20 micron resolution using our zoom-in tomography technique and observed the bone changes for 12 weeks. We selected ROI (region of interest) of a femur image and applied 2D FDT (fuzzy distance transform) to measure the trabecular bone thickness. The measured results showed obvious bone changes and big differences between control and ovariectomized groups. However, we found that the reliability of the measurement depended on the selection of ROI in a bone image for thickness calculation. So, we extended the method to 3D FDT technique. We selected 3D VOI (volume of interest) in the obtained 3D tomographic images and applied 3D FDT algorithm. The results showed that the 3D technique could give more accurate and reliable measurement.
요실금 치료용 자기 자극기의 자속밀도 및 유도전류 측정
한병희,최경무,조민형,이수열,Han, Byung-Hee,Choi, Kyung-Moo,Cho, Min-Hyoung,Lee, Soo-Yeol 대한의용생체공학회 2009 의공학회지 Vol.30 No.4
A simple method for measuring magnetic flux and induced current in magnetic nerve stimulation for urinary incontinence treatment is proposed. Unlike electric nerve stimulation, direct measurement of the induced current in magnetic nerve stimulation is impossible. Since induced currents stimulate nerves or muscles in magnetic nerve stimulation, measuring induced current is very important in validating stimulation efficacy and securing safety. The magnetic flux measuring system is composed of 6 layers with pick-up coils of 7 by 7 in each layer, and the induced current measuring system is composed of 6 layers with 7 concentric circular coils in each layer. The proposed method can be used in the design or performance test of a magnetic nerve stimulator for many clinical applications such as urinary incontinence treatment, activation of peripheral nerves, and transcranial magnetic stimulation.
김효근,이수열,조민형,Kim, Hyo-Geun,Aowlad Hossain, A.B.M.,Lee, Soo-Yeol,Cho, Min-Hyoung 대한의용생체공학회 2011 의공학회지 Vol.32 No.2
Breast cancer is the most frequently appearing cancer in women, these days. To reduce mortality of breast cancer, periodic check-up is strongly recommended. X-ray mammography is one of powerful diagnostic imaging systems to detect 50~100 um micro-calcification which is the early sign of breast cancer. Although x-ray mammography has very high spatial resolution, it is not easy yet to distinguish cancerous tissue from normal tissues in mammograms and new tissue characterizing methods are required. Recently ultrasound elastography technique has been developed, which uses the phenomenon that cancerous tissue is harder than normal tissues. However its spatial resolution is not enough to detect breast cancer. In order to develop a new elastography system with high resolution we are developing x-ray elasticity imaging technique. It uses the small differences of tissue positions with and without external breast compression and requires an algorithm to detect tissue displacement. In this paper, computer simulation is done for preliminary study of x-ray elasticity imaging. First, 3D x-ray breast phantom for modeling woman's breast is created and its elastic model for FEM (finite element method) is generated. After then, FEM experiment is performed under the compression of the breast phantom. Using the obtained displacement data, 3D x-ray phantom is deformed and the final mammogram under the compression is generated. The simulation result shows the feasibility of x-ray elasticity imaging. We think that this preliminary study is helpful for developing and verifying a new algorithm of x-ray elasticity imaging.
3D 초음파 영상에서 방광 내 잔뇨량 추정을 위한 새로운 알고리즘
조태식,이수열,조민형,Cho, Tae Sik,Lee, Soo Yeol,Cho, Min Hyoung 대한의용생체공학회 2016 의공학회지 Vol.37 No.1
For the patients with bladder dysfunction, measurement of urine volume inside the bladder is very critical to avoid bladder failure. In measuring urine volume inside a bladder, low-resolution 3D ultrasound images are widely used. However, urine volume estimation from 3D ultrasound images is prone to big errors and inconsistency because of low spatial resolution and low signal-to-noise ratio of ultrasound images. We developed a new robust volume estimation algorithm which is not computationally expensive. We tested the algorithm on a lab-built ultrasound bladder phantom and volunteers. The average error rate of the human bladder volume estimation was 5.9% which was better than the commercial machine.
소형 동물의 생체 촬영을 위한 고해상도 Micro-CT 시스템의 개발
박정진,이수열,조민형,Park, Jeong-Jin,Lee, Soo-Yeol,Cho, Min-Hyoung 대한의용생체공학회 2007 의공학회지 Vol.28 No.1
Recently, small-animal imaging technology has been rapidly developed for longitudinal screening of laboratory animals such as mice and rats. One of newly developed imaging modalities for small animals is an x-ray micro-CT (computed tomography). We have developed two types of x-ray micro-CT systems for small animal imaging. Both systems use flat-panel x-ray detectors and micro-focus x-ray sources to obtain high spatial resolution of $10{\mu}m$. In spite of the relatively large field-of-view (FOV) of flat-panel detectors, the spatial resolution in the whole-body imaging of rats should be sacrificed down to the order of $100{\mu}m$ due to the limited number of x-ray detector pixels. Though the spatial resolution of cone-beam CTs can be improved by moving an object toward an x-ray source, the FOV should be reduced and the object size is also limited. To overcome the limitation of the object size and resolution, we introduce zoom-in micro-tomography for high-resolution imaging of a local region-of-interest (ROI) inside a large object. For zoom-in imaging, we use two kinds of projection data in combination, one from a full FOV scan of the whole object and the other from a limited FOV scan of the ROI. Both of our micro-CT systems have zoom-in micro-tomography capability. One of both is a micro-CT system with a fixed gantry mounted with an x-ray source and a detector. An imaged object is laid on a rotating table between a source and a detector. The other micro-CT system has a rotating gantry with a fixed object table, which makes whole scans without rotating an object. In this paper, we report the results of in vivo small animal study using the developed micro-CTs.