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Tc-99m 표지 항과립구항체 면역신티그라피를 이용한 골수염의 진단
강원준,정준기,여정석,홍미경,정재민,이동수,이상훈,최인호,이명철 ( Won Jun Kang,June Key Chung,Jeong Seok Yeo,Mee Kyoung Hong,Jae Min Jeong,Dong Soo Lee,Sang Hoon Lee,In Ho Choi,Myung Chul Lee ) 대한핵의학회 1998 핵의학 분자영상 Vol.32 No.4
Purpose: The purpose of this study was to evaluate the diagnostic accuracy of Tc-99m labeled antigranulocyte antibody immunoscintigrapy in the diagnosis of osteomyelitis and compare with the results of triphasic bone scan. Materials and Methods: The study popula- tion was 39 patients (22 male, 17 female) who had uncertain diagnoses of osteomyelitis. Fifteen patients had history of orthopedic surgery, and 5 had previous fracture. One milligram of monoclonal antibody against NCA-95 was labeled with 370 MBq of Tc-99m, injected intravenously, and 4 hour images were obtained. Triphasic bone scan images were obtained in 30 p;tients. The final diagnosis was confirmed by bacteriologic culture, biopsy or long term clinical follow up. Results: Twenty one patients were confirmed to have osteomyelitis (1 acute, 20 chronic). Eighteen patients were without osteomyelitis. Antigranulocyte antibody immunoscintigraphy had a sensitivity of 71% (15/21), and a specificity of 89% (16/18), while the sensitivity and specificity of triphasic bone scan was 93% (13/14) and 38% (6/16), respectively. Antigranulocyte antibody scan showed higher specificity of 100% (11/11) in comparison with 33% (3/9) of triphasic bone scan in patients with history of orthopedic surgery or fracture. Conclusion: Antigranulocyte antibody immunoscintigraphy is more specific than that of triphasic bone scan and may be helpful in patients with history of surgery or fracture. However, sensitivity is lower than triphasic bone scan in the detection of chronic osteomyelitis. (Korean J Nucl Med 1998;32:344-53)
BLT 방정식을 이용하여 사각 aperture 사이를 통과한 고출력 전자파가 공진기 내부에 미치는 영향에 관한 연구
강원준(Won-june Kang),이비오(Vea-o Lee),문상곤(Sang-kon Mun),김준호(Jun-ho Kim),정용식(Young-seek Chung) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
In this paper, we studied on the influence of the EM waves on the cavity with rectangular apertures using BLT equation. The proposed method can solve the electromagnetic coupling on the cavity with rectangular apertures. Also, we expect that this paper will help design shielding structures for high power EM waves. The simulation results were compared with those of the full wave analysis and agreed with those of results.
단파(HF)대역 RFID 리더안테나에 의한 인체유도전류의 등가 안테나 모형 연구
문상곤(Sang-Gon Moon),강원준(Won-June Kang),이종건(Jong-Gun Lee),변진규(Jin-Kyu Byun),최형도(Hyung-Do Choi),천창율(Chang-yul Cheon),이병제(Byungje Lee),정용식(Young-Seek Chung) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
전자파가 인체에 미치는 영향에 대한 연구중 SAR(Specific Absorption Ratio)에 관한연구는 매우 활발하게 이루어지고 있으나 단파 (High Frequency)대역에 의한 인체유도전류에 대한 연구는 미흡한 편이다. 본 연구에서는 근거리장에서 단파대역 RFID 리더 안테나에 의한 인체에 유도되는 전류를 측정하고 이를 등가화 할 수 있는 수직교차루프 형태의 인체등가 모형을 제시하여 인체의 유도전류량과 비교하였다.
특발성 폐섬유증에서 발견된 폐결절의 악성여부 감별에서 F-18 FDG PET의 유용성
김범산 ( Bom Sahn Kim ),강원준 ( Won Jun Kang ),이동수 ( Dong Soo Lee ),정준기 ( June Key Chung ),이명철 ( Myung Chul Lee ) 대한핵의학회 2006 핵의학 분자영상 Vol.40 No.3
목적: 특발성 폐섬유증(Idiopathic pulmonary fibrosis: IPF)에서 폐암의 발생빈도가 정상인에 비하여 증가되어 있음이 알려져 있다. IPF 환자의 흉부전산화단층촬영(chest CT)에서 폐 결절이 관찰되는 경우 폐암의 발생과 자체 IPF자체의 결절을 감별하기 어렵다. 이 연구에서는 IPF 환자의 chest CT에서 관찰된 결절의 악성 여부를 FDG PET을 이용해 분석하였다. 대상 및 방법: IPF로 진단된 환자 중, chest CT에서 악성 결절이 의심되어 FDG PET을 시행한 16명을 대상으로 하였다. 총 16명 (남: 14, 여: 2, 나이: 67.53±9.83세)의 환자에서 관찰된 28개의 결절에 대하여 FDG PET과 CT소견을 분석하였다. 대상 환자 중 2명은 소세포암과 성문하암으로 치료 받은 병력이 있었으며, 나머지 환자는 악성종양의 기왕력이 없었다. 결절의 악성도 여부는 조직검사와 CT 추적검사로 판정하였다. 결과: 10개의 결절은 폐암으로 진단되었고, 18개의 결절은 양성 결절로 판정되었다(조직병리검사: 6예, chest CT 추적검사: 22예). FDG PET의 예민도는 100%이었으며 특이도는 94.4%이었다. 크기와 형태 및 크기 변화 등을 참고한 CT의 예민도는 70%이었고, 특이도는 44.4%이었다. 악성 결절의 maxSUV는 7.68±3.96, 양성 결절은 1.22±0.65이었다(p<0.001). 폐섬유증부위에서 측정한 maxSUV는 1.80±0.43로써 악성 결절보다 낮은 값이었으며, 양성 결절보다는 높은 값이었다(p<0.001; p<0.001). CT에서 측정한 악성 결절의 크기는 23.95±10.15 mm, 양성결절은 10.83±5.23 mm이었다(p<0.02). 결론: FDG PET은 IPF 환자의 CT에서 발견된 폐 결절을 감별하는데 도움이 되었다. Purpose: Incidence of lung cancer in patients with idiopathic pulmonary fibrosis (IPF) is known to be higher than that in general population. However, it is difficult to discriminate pulmonary nodule in patients with IPF, because underlying IPF can be expressed as lung nodules. We evaluated the diagnostic performance of FDG PET in discriminating lung nodule in patients with IPF. Methods: We retrospectively reviewed 28 lung nodules in 16 subjects (age; 67.53±9.83, M:F=14:2). Two patients had previous history of malignant cancer (small cell lung cancer and subglottic cancer). The diagnostic criteria on chest CT were size, morphology and serial changes of size. FDG PET was visually interpreted, and maximal SUV was calculated for quantitative analysis. Results: From 28 nodules, 18 nodules were interpreted as benign nodules, 10 nodules as malignant nodules by histopahthology or follow-up chest CT. The sensitivity and specificity of FDG PET were 100% and 94.4%, while those of CT were 70.0% and 44.4%, respectively. Malignant nodule was higher maxSUV than that of benign lung nodules (7.68±3.96 vs. 1.22±0.65, p<0.001). Inflammatory lesion in underlying IPF was significantly lower maxSUV than that of malignant nodules (1.80±0.43, p<0.001). The size of malignant and benign nodule were 23.95±10.15 mm and 10.83 ±5.23 mm (p<0.01). Conclusion: FDG PET showed superior diagnostic performance to chest CT in differentiating lung nodules in patients with underlying IPF. FDG PET could be used to evaluate suspicious malignant lung nodule detected by chest in patients with IPF. (Nucl Med Mol Imaging 2006;40(3):163-168)
수술 후 암 재발 판정에 있어서 전신 F - 18 FDG - PET의 유용성
고창순(Chang Soon Koh),이명철(Myung Chul Lee),정준기(June Key Chung),이동수(Dong Soo Lee),강원준(Won Jun Kang),정재민(Jae Min Jeong),소영(Young So),곽철은(Cheol Eun Kwark),강순범(Soon Beum Kang),정희원(Hee Won Jung),김광현(Kwang Hyu 대한핵의학회 1997 핵의학 분자영상 Vol.31 No.3
N/A he purpose of this study was to evaluate the usefulness of whole body F-18 FDG PET scan for deceting postoperative recurrence of cancer. One hundred four cancer patients after operation were enrolled(l4 brain tumor, 15 head and neck cancer, 23 gynecologic cancer). Besides conventional images(CI) including CT and MRI, F-18 FDG PET scan was obtained on ECAT EXACT 47 scanner(Siemens-CTI), beginning 60 minutes after injection of 370MBq(10mCi) of F-18 FDG. Regional scan was also obtained with emission image. Transmission images using Ge-68 were carried out for attenuation correction in both whole body and regional images. Findings of PET and CI were confirmed by pathology or clinical follow up. The sensitivity and specificity of PET for detecting recurrence were 94% and 92%, respectively. Contrarily, the sensitivity and specific it of CI were 78% and 68% CI results were negative and PET results were positive in 11 cases. The biopsy or clinical follow-up of those cases confirmed recurrence of tumor. False negative cases of CI were frequent in patients with gynecologic cancers. Also we measured the Serum concentration of tumor markers in patients with gynecologic cancer(CA125), thyroid cancer(thyroglobulin), and colorectal cancer(CEA). The sensitivity and specificity of tumor markers were 71% and 84%, respectively. We conclude that F-18 FDG PET can be used valuably in detecting recurrent foci of a wide variety of malignancy compared to conventional diagnositic methods.
FMCW 레이더 시스템의 간섭 모델의 제안과 시뮬레이션
문상곤(Sang kon Moon),이비오(Vea-o Lee),강원준(Won-june Kang),김준호(Junho Kim),천창율(Chang-yul Cheon),정용식(Young-seek Chung) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
지능형 교통정보 시스템(ITS : Intelligent Transport System)은 원활한 교통 흐름과 자동차의 주행 안전성을 위해 현재 활발히 연구가 진행되고 있는 기술이다. 이를 위한 거리 측정 센서로 최근에는 밀리미터파를 이용한 FMCW 레이더 구조가 많이 제안되고 있으며 실제로 미국 및 유럽, 일본에서는 이미 47, 60, 77, 94, 139 ㎓ 등이 차량용 레이더 주파수로 할당되어 있다. 본 논문에서는 이런 FMCW레이더의 주변 간섭에 대한 영향을 분석하기 위해 FMCW레이더 및 간섭상황을 모델링하고 이를 시뮬레이션 하였다. 또한 레이더에 적용되던 기존의 성능 분석 지표인 Pd, Pfa 이외에 좀더 현실적인 레이더 성능 분석 파라메터로 RER(Radius Error Rate)을 제시하고 검증 하였다.
유전 알고리즘 기반의 이중 반사경 안테나 형상최적화 기법
박정근(Jung-Geun Park),정용식(Young-Seek Chung),강원준(Won-June Kang),신진우(Jin-Woo Shin),소준호(Joon-Ho So),천창율(Chang-yul Cheon) 한국전자파학회 2015 한국전자파학회논문지 Vol.26 No.5
본 논문에서는 고이득 이중 반사경 안테나(DTA: Dual Reflector Antenna)의 성능 향상을 위한 최적설계 기법으로 유전알고리즘(GA: Genetic Algorithm)을 적용하였다. 또한, 최적설계과정에서 반복해석에 요구되는 계산 시간을 줄이고자 ADE 안테나의 각 반사경의 표면전류분포 계산에 반복적 물리광학법(IPO: Iterative Physical Optics)을 이용하였다. 물리광학법 적용시 음영지역에 대한 고려 및 다중반사에 의한 영향을 MFIE(Magnetic Field Integral Equation) 기반의 반복적인 계산을 통해서 해의 정확도를 향상시켰다. 또한, 설계변수의 축소 및 제작 가능한 부드러운 곡면 형성을 위하여 베지어 곡선을 적용하였다. 이럴 경우, 베지어 곡선의 제어점이 설계변수로 설정이 된다. 최적설계를 위한 목적함수로 HPBW(Half Power Beam Width), FNBW(First Null Beam Width), SLL(Side Lobe Level) 등을 고려하였으며, 설계 및 해석의 결과를 기존의 상용 해석프로그램과 비교하였다. In this paper, we propose an optimal design method for a dual reflector antenna(DRA) using the Genetic algorithm. In order to reduce the computational burden during the optimal design, we exploit the iterative physical optics(IPO) to calculate the surface current distribution at each reflector antenna. To improve the accuracy, we consider the shadow effect by the structure and the coupling effect by the multi-reflection based on the iterative MFIE(Magnetic Field Integral Equation). To reduce the number of design variables and generate a smooth surface, we use the Bezier function with the control points, which become the design variables in this paper. We adopt the HPBW(Half Power Beam Width), the FNBW(First Null Beam Width), and the SLL(Side Lobe Level) as the objective or cost functions. To verify the results, we compare them with the those of the commercial tool.
게이트 심근 관류 SPECT의 관상 동맥 질환 진단 성능
고창순(Chang Soon Koh),이명철(Myung Chul Lee),정준기(June Key Chung),이동수(Dong Soo Lee),이명묵(Myoung Mook Lee),강원준(Won Jun Kang) 대한핵의학회 1997 핵의학 분자영상 Vol.31 No.1
N/A We studied to investigate the predictive values of gated SPECT for the improvement of wall motion after bypass surgery. As we compared postoperative SPECT with preoperative ones, we defined viability as wall motion improvement. We performed rest T1-20l/stress Tc-99m-MIBI gated SPECT in 25 patients before and 3 months after bypass surgery. Myocardial wall motion was graded as normal, hypokinesia, a kinesia, and dyskinesia by pair-wise visual analysis of gated pre and postoperative SPECT's on the same monitor wall motion abnormalities before operation, 69 (75%) improved and 23 did not. Before operation, we could find segments with good systolic thickenining 64 segments among total 92. Thickening of the remaining 28 was poor. Wall motion improved postoperatively in 45 segments (70%) among 64 with good thickening, Twenty four(86%) among 28 segments with poor thickening had also improved. We grouped segments into mild(hypokinetic) and severe(akinetic/dyskinetic) ones. Among 33 segments with severe motion abnormalities, 14 had good thickening and 19 did not. Nine(60%) improved out of 14 segments having severe abnormality with good thickening. However, 16(84%) segments out of 19 having severe abnormality with poor thickening also improved. Neither degree of perfusion decrease nor severity of wall motion abnormalities could explain the high rate of false negatives. In conclusion, as we defined viability as wall motion improvement by comparing pre and postoperative SPECT, systolic thickening observed by gated Tc-99m-MIBI SPECT in myocardial segments with wall motion abnormalities predicted wall motion improvement after bypass surgery. However, poor thickening could not be referred as evidence of nonviable myocardium both in mild and severe contractile dysfunction, so that we might need stimulation study such as dobutamine echocardiography or dobutamine gated SPECT.