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백종근,장현수,오영기,이현정,김응찬 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.1
The purpose of this study was to evaluate the setup uncertainties for single-fraction stereotactic radiosurgery (SF-SRS) based on clinical data with two different mask-creation methods using pretreatment con-beam computed tomography imaging guidance. Dedicated frameless fixation Brain- LAB masks for 23 patients were created as a routine mask (R-mask) making method, as explained in the BrainLAB’s user manual. Alternative masks (A-masks), which were created by modifying the cover range of the R-masks for the patient’s head, were used for 23 patients. The systematic errors including these for each mask and stereotactic target localizer were analyzed, and the errors were calculated as the means ± standard deviations (SD) from the left-right (LR), superior-inferior (SI), anterior-posterior (AP), and yaw setup corrections. In addition, the frequencies of the threedimensional (3D) vector length were analyzed. The values of the mean setup corrections for the R-mask in all directions were < 0.7 mm and < 0.1, whereas the magnitudes of the SDs were relatively large compared to the mean values. In contrast, the means and SDs of the A-mask were smaller than those for the R-mask with the exception of the SD in the AP direction. The means and SDs in the yaw rotational direction for the R-mask and the A-mask system were comparable. 3D vector shifts of larger magnitude occurred more frequently for the R-mask than the A-mask. The setup uncertainties for each mask with the stereotactic localizing system had an asymmetric offset towards the positive AP direction. The A-mask-creation method, which is capable of covering the top of the patient’s head, is superior to that for the R-mask, so the use of the A-mask is encouraged for SF-SRS to reduce the setup uncertainties. Moreover, careful mask-making is required to prevent possible setup uncertainties.
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Successful treatment by exchange transfusion of a young infant with sodium nitroprusside poisoning
백종근,정활림,박지숙,서지현,박은실,임재영,박찬후,우향옥,윤희상,염정숙 대한소아청소년과학회 2010 Clinical and Experimental Pediatrics (CEP) Vol.53 No.8
Although sodium nitroprusside (SNP) is often used in pediatric intensive care units, cyanide toxicity can occur after SNP treatment. To treat SNP-induced cyanide poisoning, antidotes such as amyl nitrite,sodium nitrite, sodium thiosulfate, and hydroxycobalamin should be administered immediately after diagnosis. Here, we report the first case of a very young infant whose SNP-induced cyanide poisoning was successfully treated by exchange transfusion. The success of this alternative method may be related to the fact that exchange transfusion not only removes the cyanide from the blood but also activates detoxification systems by supplying sulfur-rich plasma. Moreover,exchange transfusion replaces cyanide-contaminated erythrocytes with fresh erythrocytes, thereby improving the blood’s oxygen carrying capacity more rapidly than antidote therapy. Therefore, we believe that exchange transfusion might be an effective therapeutic modality for critical cases of cyanide poisoning.
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GEANT4 코드를 이용한 25-150 keV 광자빔 생성 전산모사
백종근,장현수,오영기,김형동,김병용,이현정,김응찬 한국물리학회 2016 새물리 Vol.66 No.11
Low-energy photons are necessary to improve portal image quality, but are absorbed by the linear accelerator's head components such as the target or the flattening filter. This study is a preliminary study on using low-atomic number (Z) target materials to generate photon beams with energies in the diagnostic energy range of 25 to 150 keV in the 6 MeV electron mode. Beryllium (Z = 2), carbon (Z = 4), and aluminium (Z = 13) were used as low-Z target materials in this study. GEANT4 Monte Carlo simulations were carried out to calculate the photon energy spectrum and the number of produced particles (electrons, photons, 25 to 150 keV photons) for different target materials and thicknesses. Based on the results of GEANT4 Monte Carlo simulations, photons with energies in the range from 25 to 150 keV accounted for more than 34% of the total numbers of photons in the three target materials. On the other hand, 6 MV photons, which were used to acquire the conventional portal imaging, have low-energy photons accounting for 0.3% of the total. This result means that the photons newly generated by using the low-Z target material may improve the portal image quality. 포탈영상의 품질의 향상시키기 위해서는 진단영역 (25-150 keV)의 방사선선원이 요구된다. 본 연구는 실제 치료용 선형가속기에서 진단영역 에너지를 가지는 광자빔을 생성하기 위한 선행연구이다. 텅스텐 타겟에 비해 상대적으로 원자번호가 낮은 베릴륨 (Be, Z=4)과 카본 (C, Z=6), 그리고 알루미늄 (Al, Z=13) 타겟을 GEANT4 코드에 적용하여 몬테카를로 (Monte Carlo) 전산모사를 수행하였다. GEANT 4 몬테카를로 전산모사 결과를 통해 각 물질의 두께 별 에너지 스펙트럼을 분석하였고, 생성된 전자 및 광자 그리고 25-150 keV 에너지의 광자의 입자수를 비교 분석하였다. 세가지 타겟 모두 전체광자빔 중 25-150 keV 에너지를 포함하는 광자빔을 34% 이상 생성할 수 있음을 확인하였다. 이는 기존의 포탈영상의 방사선선원으로 사용되는 6 MV 광자빔 (0.3%)에 비해 현저히 높은 진단영역의 에너지를 가지는 광자를 생성하는 것으로, 포탈영상의 품질을 향상시킬 수 있는 새로운 방사선선원이 생성될 수 있음을 의미한다.
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RF 플라즈마 연소법으로 합성된 나노 Fe-Ni-Mo 자성분말의 자기적 특성
백종근,양충진,김응찬,박언병 한국물리학회 2007 새물리 Vol.55 No.5
The objective of this research is to investigate the electromagnetic shielding characteristic and the transparency of Fe-Ni-Mo alloy nanopowders (MPP) (below 100 nm). Fe-Ni alloy powder was synthesized by RF plasma system. Sheath gas , central gas and other gases related plasma environment are supplied with optimized conditions. Synthesized powders collected on different positions were analyzed by x-ray diffraction(XRD), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), particle size analyzer. The X-ray diffraction patterns for Fe-Ni-Mo Alloy nanopowder showed a typical Fe-Ni alloy phase and structures. Particle size analyzer and TEM showed an avergage 90 $\sim$ 100 nm size of nanoparticle and spheroidization. Magnetic hysteresis (M-H) curve showed magnetic properties between precursor and synthesized nanopowder. There is no difference between the two. As a result, synthesized Fe-Ni-Mo nanopowders (MPP) has transparency without loosing electromagnetic shielding characteristic 고주파 부품 및 유해 전자파 차폐소재로 응용되는 대표적 연자성 재료인 Fe-Ni 합금 분말인 퍼멀로이 분말을 나노화하게 되면 소재의 광투과율에 영향을 끼치지 않게 되어 전자파 차폐와 투명성을 동시에 요구하는 더 많은 전자기기 및 산업분야에 응용될 수 있다. 그러나 합금형태의 분말은 나노화가 어렵다. 따라서 본 연구에서는 합금계 분말의 나노화에 적합하도록 제작된 RF-플라즈마 연소법을 사용하여 유해 전자파 차폐 소재로 응용되고 있는 마이크로 크기의 Fe-Ni-Mo 합금 분말을 평균 100 nm 이하로 나노 분말화하고, 제조된 나노 분말과 마이크로 분말을 비교 분석하여 전자파 차폐 특성과 투명성을 동시에 만족할 수 있는지 확인해 보고자 한다. 제조된 Fe-Ni 합금 나노 분말 (MPP)의 자기적 특성을 진동시료형 자력기를 통해 비교, 평가하였고 X-선 회절을 통해 나노 분말 상 및 구조를 평가하였다. 또한 입도 분석기와 투과전자 현미경을 통해 제조된 나노 분말의 크기와 형태를 비교 분석하였다.
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PIUG 2003 Annul Conference 참가 결과 보고서
백종근,Baek, Jong-Geun 한국특허정보원 2003 Patent 21 Vol.48 No.-
한국특허정보원은 지난 5월 2일부터 10일까지 미국 시카고 할리데이 인 마트프라자에서 개최된 PIUG 2003 Annual Conference에 참가했다.이번 호에서는 이번 행사 참가 결과 보고서를 게재한다.
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