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곽영곤,Yeong-Gon Kwak 대한핵의학기술학회 2023 핵의학 기술 Vol.27 No.1
Carbon materials are widely used in many areas of our lives. A fiber having a carbon content of 90% or more obtained by heating an organic fiber precursor is referred to as a "carbon fiber". Carbon fibers are currently used in the medical market to manufacture radiation transmission device parts, artificial joints, and medical aids, as many developments have been made to utilize carbon fibers' characteristics such as light weight, radiation permeability, biocompatibility, high strength, high heat resistance, thermal conductivity, and electrical conductivity. In order to maintain body temperature and increase immunity in long-lasting nuclear medical examination and treatment through the idea of convergence of carbon materials and radiation technology, the quality of medical services can be improved by utilizing carbon materials. We should be aware of the domestic carbon-based medical device industry and make efforts to contribute to the development of medical devices. As a radiation expert, we should try to use our skills and experience to find items that can be fused with medical devices to develop various nuclear medical examination fields and radiographic examination fields that can be widely applied. We should actively engage in future technology development and carbon material research to strengthen the global competitiveness of the domestic medical device industry and improve the quality of medical services.
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대퇴 골두 충돌 증후군(Cam type)의 진단과 치료를 위한 자기공명 3D 영상 재구성 기법의 유용성
곽영곤(Yeong-Gon Kwak),김종일(Chong-Yeal Kim),조영기(Yeong-Gi Cho) 한국콘텐츠학회 2015 한국콘텐츠학회논문지 Vol.15 No.11
Hip FAI 진단과 수술 계획 시 Hip FAI MRI 검사시 3D 영상을 추가로 활용하여 CT 영상으로 이루어지는 Hip Clock face 영상을 MRI 3D 영상으로 대체할 수 있는지 비교 평가 하였다. Hip 자기공명 영상검사(MRI)와 3D Hip 컴퓨터 단층 촬영(CT)을 동시 시행한 환자 31명 (남: 21명 평균연령: 35세 여: 10명 평균연령: 40.3세)을 대상으로 분석하였으며, 영상평가는 정형외과 전문의 1명과 영상의학과 전문의 1명이 MR과 CT modality에서 Hip joint articular transverse ligament의 6 o’clock을 중심으로 Superior을 12 o’clock, Labrum의 전면을 3 o’clock, 반대쪽을 9 o’clock로 기술하는 Clock face을 재구성 한 후 11 o’clock에서 A. retinacular vessel, B. head neck junction, 12 o’clock A. Epiphyseal line, B. Cam lesion, 1,2,3,4 o’clock의 Cam lesion, Posterior Cam lesion확인 여부를 리커트(Likert scale) 5점 척도로 평가하였다(Independent t-test p〈0.05). 리커드 척도 결과 11 o’clock A. retinacular vessel MR 평균 값 3.69 ± 1.0, CT 평균값 2.8 ± 0.78이며 통계적으로 유의하였다(p〈0.001). B. head neck junction은 두 평가자간 차이가 없었다(p〈0.416). 12 o’clock A. Epiphyseal line MR 평균값 3.54 ± 1.00, CT 평균값 4.5 ± 0.62이었다(p〈0.000). B. Cam lesion은 두 평가자간 차이가 없었다(p〈0.532). 1,2,3,4 o’clock 의 Cam lesion과 Posterior Cam lesion은 통계적으로 유의하지 않았다(p〈0.656, p〈0.658). weighted Kappa 검증 결과 11 o’clock A.retinacular vessel CT K값이 0.663으로 가장 낮은 일치도였으며, 각각의 평가 항목의 일치도 평가 결과 매우 높은 결과로 두 평가자간 높은 신뢰도를 보여주었다. To minimize CT examination for Hip FAI diagnosis and operation plan. also, whether the MRI 3D images can replace Hip Clock face image was evaluated when performing Hip FAI MRI by using additional 3D image. This study analyzed Hip MRI and 3D Hip CT images of 31 patients in this hospital. For the purpose of evaluating the images, one orthopedic surgeon and one radiology specialist reconstructed Clock face, at MR and CT modality, by superior 12 o’clock, labrum front 3 o’clock, and the other side 9 o’clock, centering on Hip joint articular transverse ligament 6 o’clock. Afterwards, by the Likert Scale 5 point scale (independent t-test p<0.005), this study evaluated the check-up of A. retinacular vessel, B. head neck junction at 11 o’clock, A. Epiphyseal line, B. Cam lesion at 12 o’clock, and Cam lesion, Posterior Cam lesion at 1,2,3 and 4 o’clock. As for the verification of reliability among observers, this study verified coincidence by Cohen’s weighted Kappa verification. As a result of Likert scale for the purpose of qualitative evaluation about the image, 11 o’clock A. retinacular vessel MR average was 3.69 ± 1.0 and CT average was 2.8 ± 0.78. B. head neck juncton didn’t have a difference between two observers (p <0.416). 12 o’clock A. Epiphyseal line MR average was 3.54 ± 1.00 and CT average was 4.5 ± 0.62(p〈0.000). B. Cam lesion didn’t have a difference between two observers (p <0.532). 1,2,3,4 Cam lesion and Posterior Cam lesion were not statistically significant (p <0.656, p <0.658). As a result of weighted Kappa verification, 11 o’clock A.retinacular vessel CT K value was 0.663 and the lowest conformity. As a result of coincidence evaluation on respective item, a very high result was drawn, and two observers showed high reliability.
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전산화 단층검사 시 Bismuth와 CARE kV System을 이용한 선량 저감화에 대한 연구
곽영곤(Yeong-Gon Kwak),김종일(Chong-Yeal Kim),정성표(Seong-Pyo Jeong) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.8
본 논문에서는 전산화 단층검사 시 방사선 투과 물질로 방사선량을 흡수하여 피폭 선량을 감소시키는 물질로 알려진 차폐용 Bismuth(비스무스)와 CARE kV(Automated Dose-Optimized Selection of X-ray Tube Voltage)을 사용하여 유용성을 평가하였다. 방사선 감수성이 높은 기관인 수정체(안와), 갑상선, 가슴(유방), 생식기의 선량 감소 효과와 각 기관의 심부선량 차폐 효과를 평가하기 위해 Rando Phantom과 유리 선량계를 이용하여 Bismuth 사용 전·후와, CARE kV의 적용에 따른 선량 감소 효과를 비교해 보았다. 그 결과, 뇌혈관 검사 시 CARE kV을 단독 설정한 검사 방법의 선량이 가장 적었으며, CARE kV 사용여부에 따라 63%의 선량 감소 효과가 있었다. 경동맥 검사 시 CARE kV+Bismuth의 설정 방법에서 선량이 13% 증가하였다. 심혈관 검사 시 CARE kV+Bismuth의 설정 방법이 31% 선량 감소 효과가 있었다. 하지 혈관 검사 시 Bismuth 전체의 설정 방법이 가장 선량이 적게 측정되었지만, 영상 평가 기준에 부적합 하였다. CARE kV을 설정한 검사 방법과는 약 9%의 선량 감소 효과가 있었다. The purpose of this study is to compare the reduction of the dose radioactivity by CARE kV with that of the Bismuth shielding. First, CT was performed with transparent materials, including a Bismuth shielder which is a well-known material for decreasing the dose of radiation. Moreover, we have estimated and compared the affects of the reduction of dose on eye lens, thyroid, breast and genitals. These steps aim to compare reactions with and without the application of the Rando phantom with PLD as well as with CARE kV or not. As a result, during the Brain angio scan, the dose of CARE kV set inspection test methods showed the least dose. Depending on whether we use CARE kV, which showed the effect of dose reduction by 63%. During the Carotid angio scan, the dose was increased by 13% by how to set CARE kV+Bismuth. During the Cardiac angio scan, which showed the effect of dose reduction by 31% by how to set CARE kV+Bismuth. During the Lower extremity angio scan, the dose was measured least by how to set up the whole Bismuth. Compared with CARE kV set of test methods, which showed the effect of dose reduction by 9%.
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