http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 권수일 (검색결과 115 건)
- 무료
- 기관 내 무료
- 유료
-
-
글루코스와 요산이 첨가된 MAGIC중합체 겔 선량계의 선량특성
권수일 한국물리학회 2013 새물리 Vol.63 No.6
Glucose and urea were added to the MAGIC gel dosimeter, and the effect of that addition on the soft tissue equivalence and dose sensitivity was analyzed. A polymer gel was synthesized under normoxic conditions, put it into an 8-ml glass vial, and stored in a refrigerator at 5 C. The gel dosimeters were irradiated at 50 Gy by using a Cs-137 Biobeam 8000 sources. The relaxation rate (R_2) was obtained to analyze the dose sensitivity by using 3.0 T magnetic resonance imaging (MRI). By adding glucose and urea to the MAGIC gel dosimeter, we confirmed that the increases in the carbon and the nitrogen contents improved not only the soft tissue equivalence but also the dose sensitivity. MAGIC겔 선량계에 글루코스 (glucose)와 요산 (urea)을 첨가하여 인체조직등가성 (soft tissue equivalence)과 선량민감도 (dose sensitivity)에 미치는 영향을 분석하였다. 겔 선량계는 정상산소상태에서 합성하였으며 8 ml의 유리병에 담아 5 C에서 냉장보관하였다. 겔 선량계는 Biobeam8000 Cs-137 감마선 조사장치를이용하여 50 Gy까지 선량을 조사하였다. 3.0 T 자기공명영상장치 (MRI)를이용하여 이완률 (R_2, relaxation rate)값을 구하여 선량민감도를분석하였다. MAGIC 겔 선량계에 글루코스와 요산을 첨가하여 탄소와 질소함량을 증가시키므로 인체 연부조직 등가성을 향상시킬 수 있었을 뿐 만아니라 선량민감도를 향상시키는데도 효과가 있음을 확인하였다.
-
권수일,신동호,송재영,안진호 京機大學校 2006 論文集 Vol.50 No.-
Film dosimetry as a part of patient specific intensity modulated radiation therapy quality assurance (IMRT QA) has been accomplished to develop the new optimization method of film isocenter offset and to suggest the new quantitative criteria for film doimetry after optimization. Five patients with head and neck cancers were measured in IMRT dosimetry by film method. Optimization method with the local minimum was developed to adjust the film isocenter offset error, which is the biggest part of systemic errors. The mean ratios were 5.33% and 7.09% for 5mm and 1 mm resolution dose data optimization respectively.
-
권수일,신동호 한국의학물리학회 2002 의학물리 Vol.13 No.1
실험실에서 성장시킨 CsI(T1)섬광체를 이용하여 검출기를 설계 제작하고 분광 및 출력특성을 조사하여 핵분광과 진단방사선센서로서의 응용가능성을 타진해 보았다. CsI(T1)단결정은 수직 Bridgman성장장치를 이용하여 지름 11mm, 몰농도 0.001mo1%로 성장시키었다. 이 단결정을 광다이오드를 이용하여 방사선 센서로 제작한 후, $^{22}$ Na, /up 137/Cs, $^{30}$ Co 표준감마선원에 대한 에너지 분해능을 각각 측정하였으며 진단 X선 영역에 대한 출력특성도 측정하였다. $^{22}$ Na의 0.511 MeV 의 경우13.2%, $^{137}$Cs의 0.662 MeV의 경우 8.3%, 그리고 $^{60}$Co의 1.17 MeV와 1.332 MeV에 대해서는 각각 6.7%와 5.1%의 에너지 분해능을 얻었다. 또한 관전압 60kVp, 80kVp, 100kVp, 120kVp 에 대하여 5mAs부터 80mAs 까지 진단 X선영역에 대한 출력 선형성을 확인하였다. CsI(T1) single crystal was grown in a Bridgman growing apparatus, which has the diameter of 11 mm and the mole ratio of 0.001 mol%. Radiation sensors were made with CsITl)crystal and two photodiodes, and measured spectroscopic characteristics and linearity for gamma-ray and X-ray. The energy resolution of CsI(T1) radiation sensor has been measured with $^{22}$ Na, $^{137}$ Cs and $^{60}$ Co gamma standard sources. Also output linearity of CsITl) sensor was measured for diagnostic radiation region. The energy resolutions of CsI(T1) radiation sensor for 0.511MeV gamma-ray from Na-22 source, 0.662MeV from Cs-137 source, and 1.17MeV and 1.332MeV from Co-60 source were 13.2%, 8.3%, 6.7%, and 5.1% respectively. Also the output linearity up to 80mAs current for 60kVp, 80kvp, 100kVp, 120kVp tube voltages has been studied.
-
-
-
-
-
권수일 한국물리학회 2006 새물리 Vol.52 No.2
CsI (Tl) crystals were grown by using a Bridgman growing system, and scintillation detectors were fabricated to measure the spectroscopic characteristics of gamma rays. The size of the crystal was 10 mm in diameter and 10 mm long with a 1000-ppm activator density. After the fabrication of the radiation detector with this single crystal and a bialkali photomultiplier (PMT), a multialkali PMT, or a photodiode, the energy resolutions of CsI (Tl) detectors have been measured using $^{137}$Cs, $^{22}$Na, and $^{60}$Co gamma rays. For 0.662-MeV $^{137}$Cs, the energy resolutions of the CsI (Tl) detectors were 8.5 \%, 7.7 \%, and 7.5 \% with a bialkali PMT, multialkali PMT, and a photodiode, respectirely. Bridgman 단결정성장로를 이용하여 CsI (Tl)단결정을 성장시켰으며 이를 이용하여 섬광검출기를 제작하고 감마선 분광특성을 조사하였다. 성장된 단결정의 크기는 직경 10 mm, 길이 10 mm 이고 활성제의 농도는 1000 ppm 이었다. 이들 단결정을 bialkali 광전자증배관, multialkali 광전자증배관 및 광다이오드를 이용하여 방사선 검출기로 제작한 후, $^{22}$Na, $^{137}$Cs, $^{60}$Co표준감마선원에 대한 에너지분해능을 각각 측정하고 비교하였다. 그 결과 CsI (Tl) 검출기의 $^{137}$Cs의 0.662 MeV 감마선에 대한 에너지 분해능은 bialkali 광전자증배관의 경우 8.5 \%, multialkali 광전자증배관의 경우 7.7 \%, 광다이오드의 경우 7.5 \% 를 얻었다.
-
의료영상을 위한 CdZnTe반도체검출기의 제작 및 특성
권수일 한국물리학회 2004 New Physics: Sae Mulli Vol.48 No.1
A CZT semiconductor detector was fabricated and applied to a computed tomography medical imaging system. The dimension of the CZT detector with a sub-plate were 10 10 5 mm 3 . The anodes were pixellated to 4 4 with a pixel dimension of 1.5 1.5 mm 2 . The cathode consisted of a continuous gold coating. A collimator was placed in front of the detector. The collimator hole had a hexagonal geometry and was with 30 mm long and 1.5 mm wide. Pulse counting electronics with a very short shapping time, 50 ns were used to satisfy the high photon rate in X-ray imaging. Counting rate linearity up to 3 10 5 counts per second was achieved. The spatial resolution of CT is 1.25 mm and the spatial frequency was 0.34 cycles/mm at a modulation transfer function value of 0.1.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
