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형광과 레이저 스펙클 대조도 이미징을 결합한 실시간 의료영상 시스템 개발
심민재,김이근,고택용,최진혁,안예찬,Shim, Min Jae,Kim, Yikeun,Ko, Taek Yong,Choi, Jin Hyuk,Ahn, Yeh-Chan 대한의용생체공학회 2021 의공학회지 Vol.42 No.3
It is important to differentiate between the target tissue (or organ) and the rest of the tissue before incision during surgery. And when it is necessary to preserve the differentiated tissues, the blood vessels connected to the tissue must be preserved together. Various non-invasive medical imaging methods have been developed for this purpose. We aimed to develop a medical imaging system that can simultaneously apply fluorescence imaging using indocyanine green (ICG) and laser speckle contrast imaging (LSCI) using laser speckle patterns. We designed to collect images directed to the two cameras on a co-axial optical path and to compensate equal optical path length for two optical designs. The light source used for fluorescence and LSCI the same 785 nm wavelength. This system outputs real-time images and is designed to intuitively distinguish target tissues or blood vessels. This system outputs LSCI images up to 37 fps through parallel processing. Fluorescence for ICG and blood flow in animal models were observed throughout the experiment.
부갑상선 국소화를 위한 자가형광 비디오 모니터링의 유용성
김성원,서윤수,이형신,김이근,안예찬,이강대 대한이비인후과학회 2020 대한이비인후과학회지 두경부외과학 Vol.63 No.12
Background and Objectives Near-infrared (NIR) fluorescence photo imaging provides realtime parathyroid anatomy enhancement. Moreover, autofluorescence enables intraoperative virtualreality parathyroid exploration of the optical characteristics of the parathyroid gland. Thisstudy was performed to demonstrate the new technique of visualizing the parathyroid gland usingvideo-guided autofluorescence during thyroid and parathyroid surgery and to evaluate theoutcomes. This is the first study that introduces the video-monitoring technique for intraoperativeparathyroid mapping. Subjects and Method A total of 26 patients underwent 18 total thyroidectomies and 8hemithyroidectomies in 2016. Fifty-six parathyroid glands were enrolled in this study. Surgerywas performed by NIR video-monitoring via thyroid lateral side dissection to find the parathyroidtissues and extract the thyroid glands. With the operation room light turned on, the parathyroidglands were identified by the video-guided autofluorescence detection technique carried out in 3stages (P1, P2, and P3), which are imaging with surgeon’s eyes before parathyroids exposure (P1),after identification (P2), and in extracted specimen (P3). Results The parathryoid autofluorescence could be video-monitored in real time by our NIRcamera system with the indoor room light turned on. Of the total 56 parathyroids, 52 were detectedby fluorescence. Of these, the location of 43 glands were predicted by using the high signal in a before-exposure state and the glands were confirmed as containing parathyroid tissues [in P1, sensitivity=82.69%, positive predictive value (PPV)=100.00%]. Of the nine glands that did not show highsignals in P1, seven glands visually showed fluorescence signals (in P1 and P2, sensitivity=96.15%,PPV=100.00%). One of the two glands that showed high signals in the extracted tissue was identifiedas parathyroid, but the other one was proved not by histologic examination by despite high intensityfluorescence signal (in P1-P3, sensitivity=100.00%, PPV=98.08%). The accuracy of videoguidedparathyroid mapping in P1, P2, and P3 were 83.93%, 96.43%, and 96.43%, respectively. Conclusion This is the first study that demonstrates the parathyroid gland autofluorescence asa real-time video-monitoring technique and shows that it could be applied to real surgery. Althoughparathyroid autofluorescence is a phenomenon seen in the invisible wavelength, our datasuggest that the operator can see the parathyroid fluorescent signal in real time on the videomonitor. This technique could help the operator to predict the gland location and preserve themsafely.
김태석(Tae Sug Kim),김이근(Ih Geun Kim),김지희(Chi Hui Kim),김채기(Chae Gi Kim),최정윤(Jung Yoon Choe),장성국(Sung Gug Chang),이봉열(Bong Ryeol Lee),채성철(Sung Chul Choi),전재은(Jae Eun Jun),정태훈(Tae Hoon Jung),박의현(Wee Hyun Par 대한내과학회 1997 대한내과학회지 Vol.52 No.3
Objectives: Despite the fact that determinations of cadiorespiratory fitness levels by exercise stress tests are becoming widely used in healthy individuals as well as in patients with cardiopulmonary diseases, the normal standards in this field have not been well established in Korea. The purpose of this study is to provide normal standards or reference values for the VO2 max, HR max and O2 pulse max for normal Korean adults by age and sex, along with the derivation of regression formulae of these parameters. Methods: In 1,000 healthy adults (20-66years) consisting of 603men and 397women, symptomlimited maximal exercise was carried out by Bruce protocol, allowing holding on to the hand rail of the treadmill during exercise for the safety purpose. All the subjects were non-athletes and were members of a health center and were more conscious about their health and physical fitness than the ordinary population. Results: The VO2 max and HR max were decreased with age as expected and, as a whole, the values of the VO2 max and HR max of females were approximately 84% and 90% of those of males, respectively. Estimated yearly reductions in the V max for males and females were 0.45 and 0.32mL/kg/min, respectively and those of the HR max were 0.72 and 0.76/min, respectively. The O2 pulse max of the female was approximately 70% of that of the male, and was slightly related to weight and exercise time. The regression equations of the parameters obtained using exercise time (ET, sec), age (A, year), weight (W, kg) and sex (S, O=male; 1= female) were: HR max=215.3-0.74A-5,04S, O2 pulse max= 5.371+0.216W+0.0107ET-1.505S and VO2 max=40.612+1.950ET-0.206A-0.147W-6.060S, Conclusion: The VO2 max in our study was higher than hitherto reported. This was primarily due to longer exercise time of the subjects on the treadmill, because they were allowed to hold on to the hand rail during exercise. And also, the fact that our subjects, being members of a health center, might have had higher physical fitness levels than general population could have contributed to the high VO2 max. Thus, we feel that our results could be the ideal target or- reference values to be achieved for those patients or individuals who have to do the tests with holding on to the rail of a treadmill for safety purpose.
세침흡입술 및 조직생검으로 진단한 부신 골수지방종 1예
박재복,안기성,신현수,배정동,손호상,김이근,이영환,박미옥,장성국,이상채,정영식,황준호,양전호 대한내분비학회 1997 Endocrinology and metabolism Vol.12 No.1
Adrenal myelolipomas are rare, benign tumors cornposed of mature fat and bone marrow elements. Most are small, asymptomatic tumors found incidentally at postmortem examination, Fine needle aspiration biopsy can be used to confirm the diagnosis and avoid an unnecessary operation. We report a case of adrenal myelolipoma confirmed by fine needle aspiration biopsy. A 77-year-old woman with complaining of upper abdominal pain for 2 days was found to have an adrenal mass. She took dexamethasone frequently for 3 years due to multiple arthralgia. Ultrasono- graphy showed a 6cm-sized, suprarenal mass and a stone in the gall bladder with thickened wall. Computed tomography and magnetic resonance imaging scan also presented a suprarenal mass. Endocrinologic results were within normal limits. Adrenal myelolipoma was confirmed by computed tomography-guided fine needle aspiration biopsy without surgery. (J Kor Soc Endocrinol 12:105-110, 1997)
과량의 Furosemide에 의한 저칼륨혈증에서 발생한 횡문근융해증 및 급성 신부전
박용범,박준형,손호상,안기성,이상채,배정동,신재욱,금수미,최종원,김이근,장성국 대한신장학회 1997 Kidney Research and Clinical Practice Vol.16 No.2
Though hypokalemia often goes unrecognized as a cause of rhabdomyolysis, its causal relation for acute renal failure can be considered in cases of extreme hypokalemia when combined with rhabdomyolysis. We present the case of a 21-year-old female in whom acute renal failure was developed by myoglobinuria which was associated with furosemide ind- uced hypokalemia. She had taken 2 grams of furosemide daily over 6 months before developing rhabdomyolysis. Initial neurologic examination revealed painful quadriplegia and laboratory findings showed markedly elevated blood CPK, LDH and AST levels with azotemia. Arterial blood gas analysis showed pH 7.439, serum Na 128mEq/L, K 1.5mEq/L, Cl 87mEq/L, HC% 12.6mmol/L and calculated anion gap of 29.9 which indicated that she was under the condition of mixed metabolic alkalosis and metabolic acidosis. Though intravenous infusion of potassium chloride improved muscle strength, azotemia and acidemia persisted for several days. This case suggest that large amount of furosemide, when used for a long time, can be result in the acute renal failure by rhabdomyolysis which was caused by hypokalemia.