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송호석(Ho-Seok Song),정종하(Jong-Ha Chung),이정주(Jung-Ju Lee) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
Minimally Invasive Surgery (MIS) is surgery of the chest, abdomen, spine and pelvis, done with the aid of a viewing scope, and specially designed instruments. Benefits of minimally invasive surgery are less pain, less need for post-surgical pain medication, less scarring and less likelihood for incisional complications. Since the late 1980's, minimally invasive surgery has gained widespread acceptance because of the such advantages. However there are significant disadvantages which have, to date, limited the applications for these promising techniques. The reasons are limited degree-of-freedom, reduced dexterity and the lack of tactile feeling. To overcome such disadvantages many researchers have endeavored to develop robotic systems. Even though some robot aided systems achieved success and commercialized, there still remain many thing to be improved. In this paper, the robotic system which can mimic whole motions of a human arm by adding additional DOF is presented. The suggested design is expected to provide surgeons with improved dexterity during minimally invasive surgery.
위장관계의 위석, CBD역류, 식도정맥류의 원인과 방사선학적 소견
안효근(Hyo Keun Ahn),송호석(Ho Seok Song),이충모(Chung Mo Lee),최승극(Seung Keug Choi),이신호(Shin Ho Lee) 대한영상의학기술학회 2005 대한영상의학기술학회 논문지 Vol.2005 No.1
This study is intended to examine the causes, symptoms and treatment method of the bezoar, common bile duct(CBD) reflux, and Esophageal Varix which are frequently observed in UGI and then to briefly describe the form of lesion and an inspection method. 1. Cause and radiologic findings of bezoar Bezoar is a hard indigestible mass of material found in the stomachs of humans. In particular, it can be frequently observed in patients who have achalasia, the basal motor abnormality with pooling by many causes. It also can be easily formed in stomachs because foods are not digested andremains in stomachs when the anastomosis is narrow after the subtotal gastrectomy. 2. Cause and radiologic findings of CBD reflux Patients with CBD reflux have mostly diseases in the past CBD. Its causes include 1) a tumefaction of ampula of vater, 2) vater underaction, 3) inflammation of pancreatic cancer, and 4) the barium caused by the underaction in Endoscopic retrograde cholangiopancreatography(ERCP) after the subtotal gastrectomy or in UGI after ERCP or EST. 3. Cause and radiologic findings of esophageal varices Most causes of esophageal varices are the portal hypertension. It is mainly related to the increase of portal venous pressure by the obstruction of portal vein or thrombosis of splenic vein in liver cirrhosis patients.
Usefulness of Applying 80 kV Single Energy Abdominal Computed Tomography to Patients under BMI 25
황재웅(Jae-Woong Hwang),송호석(Ho-Seok Song),박영재(Young-Jae Park),김각명(Kak-Myeong Kim),이강석(Kang-Seok Lee) 대한CT영상기술학회 2021 대한CT영상기술학회지 Vol.23 No.1
단일에너지 복부CT에서 80 kV 저관전압 사용을 통한 선량감소 효과와 이중에너지 복부CT와 같이 조영제량 감소 효과를 얻고자 하였다. 단일에너지 80 kV;단일에너지 100 kV;90 kV와 주석필터적용된 150 kV의 이중에너지 복부CT 세 그룹으로 나누고;단일에너지 80 kV 검사 시 이중에너지 복부CT 검사와 동일하게 조영제 양과 주입속도를 감소시켜서 적용하였고 각 그룹별 50건의 영상을 정량적;정성적 평가를 통해 비교하였다. 단일에너지 80 kV 영상에서 높은 신호대 잡음비를 나타내었고 대조도 잡음비는 세 그룹이 유의한 차이가 없었다.(p>0.05) 방사선량의 감소효과는 기존의 단일에너지 100 kV영상과 비교하였을 때는 미미하였으나 이중에너지 영상과 비교 시 선량감소의 효과가 있었다. 단일에너지 복부CT 검사 시 BMI 25이하의 환자에게 80 kV를 적용하면 이중에너지 복부CT와 비슷한 영상을 획득할 수 있고 조영제 감소를 통한 조영제 부작용 발생 확률을 낮출 수 있을 것으로 사료된다. It is intended to measure the effect of dose and contrast media reduction by using 80 kV in a single-energy abdominal CT like a dual-energy abdominal CT. It is divided into three groups of 80 kV of single energy CT (SECT);100 kV of SECT;90 kV and 150 kV with tin filter of dual energy CT (DECT);and reduced contrast volume and injection speed applied with 80 kV SECT like a DECT. Also;quantitative and qualitative evaluation on 50 images of each group has been conducted for comparison. Signal-to-noise ratio in a 80 kV SECT is higher than other groups. However;contrast-to-noise ratio was not significantly different among the three groups (p>0.05). Reduction of radiation dose when using 80 kV SECT was identified by comparison with DECT. However;the radiation dose was almost similar compared to the 100 kV SECT. From this study;possibility of reducing contrast media and radiation dose by applying 80 kV SECT to patients under BMI 25 can be proposed.
부인과 복강경 수술 시 Sevoflurane, Desflurane 그리고 Isoflurane의 체온조절반응
정종달 ( Jong Dal Jung ),안태훈 ( Tae Hun An ),송호석 ( Ho Seok Song ) 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.56 No.5
Background: Core temperature decreases rapidly after the induction of general anesthesia, because the heat is redistributed to peripheral tissues. Thermoregulatory responses of volatile anesthetics have been tested, but their effects have not been directly compared. Therefore, we evaluated the thermoregulatory responses to sevoflurane, desflurane, and isoflurane. Methods: Sixty healthy patients scheduled for laparoscopic myomectomy or radical hysterectomy were allocated into three groups; Group S (sevoflurane, n=20), Group D (desflurane, n=20), and Group I (isoflurane, n=20). Anesthesia was maintained with 1 minimum alveolar concentration (MAC) of sevoflurane, desflurane, and isoflurane in a 50/50 mixture of N2O/O2. Patients were maintained in a normovolemic and normocapnic state. The core temperature and forearm minus fingertip skin-temperature gradient (an index of peripheral vasoconstriction) were monitored after the induction of general anesthesia. Results: Each of the seven patients given sevoflurane, desflurane, and isoflurane vasoconstricted at a core temperature of 35.3±0.5℃, 33.6±0.4℃, and 35.2±0.4℃, respectively. The vasoconstriction threshold was the lowest in patients anesthetized with desflurane. The core temperature gradient (Ti-Tf) was significantly higher in patients that were anesthetized with desflurane than in those that were anesthetized with sevoflurane or isoflurane. The core temperature of desflurane was significantly lower than that of sevoflurane or isoflurane 15 minutes after the induction of anesthesia until 180 minutes of anesthesia. Conclusions: These results indicate that the core temperature is maintained at a higher level in patients that have been anesthetized with sevoflurane or isoflurane than in those that have been anesthetized with desflurane. (Korean J Anesthesiol 2009;56:525~30)