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RISS 인기검색어
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- 저자 : 변정인(Jung in Byun) (검색결과 4 건)
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두개부와 흉부 CT 검사시 Bismuth 차폐재를 이용한 안구의 렌즈와 유방의 선량감소에 대한 평가
변정인(Jung in Byun),남윤철(Yoon chul Nam),이홍(Hong Lee),신상보(Sang bo Shin),한동균(Dong kyoon Han) 대한CT영상기술학회 2008 대한CT영상기술학회지 Vol.10 No.1
Purpose Bismuth shield can filter twice in that penetrates X-ray, which is essential in diagnosis, and it also partially decreases skin dose. Hence, it is necessary to study the effects in reduction of absorbed dose on highly sensitive organs, which are included in the regions of cranial and chest CT exams. Materials and methods All exams were proceeded on LlghtSpeed 16MDCT (GE Medical System, Milwaukee, U.S.A.), Rando phantom (Model RAN-110, Churchin associate LID., USA) and Glass dosimetry system(GD-351,8.5mm, FGD-1000) for the measurement of radiation dose. In addition, AttenuRad radiation protection devices of eyeballs & breast (F&L Medical Products Co.) are used for protection of sensitive organs. In cranial examination, the brain CT protocols was used for the examinations, and the summary of it is as followed: The glass radiation elements were put on left and right lens of phantom eyeballs, and the radiation before and after the use of Bismuth shield were measured twice when 120kVp of current were changed into 150mAs, 200mAs, and 200mAs, and when 250mAs were changed into 100kVp, 120kVp, and 140kVp. In chest examination, low-dose protocol and chest routine protocol are used for the examination. The conditions of low-dose protocol are as followed:120kVp, noise index 11.57(10~50mA), tube rotation time 0.8sec, pitch 1.375, and table speed 13.75mm/sec. Also, the conditions of chest routine CT protocol are 120kVp, noise index 15.86(160~250mA), tube rotation time 0.8sec, pitch 1.35, and table speed 13.5mm/sec. The glass elements were put on the both nipples of phantom and the radiation before and after the use of bismuth shield were measured twice. When the shield is used, rubber-made spacer(1cm) should be on the breasts, followed by bismuth shield, because it decreases not only the scattering ray absorption into breast wall caused by bismuth shield but image artifact potentially. Results The result of the measurement of orbit shielding during cranial examination. The results of measurements of the radiation(from 120kVp to 150, 200, 250 and 300mAs) before and after the use of bismuth shield are as followed: from 18.4±0.3mGy to 10.25±0.5rnGy(44.3% decrease) at 150mAs; from 23.9±0.9mGy to 13.9±0.1mGy(41.5% decrease) at 200mAs; from 37.3±0.3mGy to 19.8±0.9mGy(47.1% decrease) at 250mAs; and from 47.8±3.4mGy to 24.4±1.4mGy(46.8% decrease) at 300mAs. On the other hand, the measurements of radiation(from 250mAs to 100, 120, and 140 kVp) before and after the use of bismuth shield are as followed: from 22.9±0.2mGy to 22.9±0.2mGy(51.2% decrease) at 100kVp; from 34.4±0.9mGy to 19.5±0.2mGy(43.3% decrease) at 120kVp; and from 49.5 ±4.4mGy to 29±1.2mGy(41.4% decrease) at 140kVp. The result of the measurement of orbit shielding during breast examination. In low-dose protocol, the results of measurements of the radiation before and after the use of bismuth shield are 3.16±0.02mGy and 2.44±0.03mGy(22.78% decrease), respectively, and in chest routine protocol, the results were 14.45±1.08mGy and 11.93±0.21mGy(17.43% decrease), respectively. Conclusion In cranial examination, there was not much change in the radiation dose of eye lens with an application of bismuth shield, even increases of mAs with constant kVp. On the other hand, the rate of reduction of radiation dose by bismuth shield is seen with constant mAs and increase of kVp. Due to the use of bismuth shield, radiation dose has been decreased about 22.8%in low-dose study, and 17.4% in chest routine study. In our hospital, the use of bismuth shield of orbit is not applied to adults, but applied to some infants only when brain CT exam was operated to them. The breast shield is applied, as a test, to women under 50 years old. According to this study, the results show obviously that the use of the bismuth shield can reduce radiation dose of highly radiation-sensitive organs. As mentioned before, the amount of radiation that eye balls received at 250mAs(at
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관상동맥 협착 진단을 위한 workstation별 QCA값의 비교 평가
김완역(Wan Yuk Kim),박건진(Kun Jin Park),변정인(Jung In Byun) 대한전산화단층기술학회 2007 대한CT영상기술학회지 Vol.9 No.1
Purpose As 64 Multi-Detector Computed Tomography systems were recently introduced and software has been variously developed, coronary CT angiography has been clinically come into notice. The patients, diagnosed with coronary arteriostenosis due to thrombi, were subject to this study. In this study, Quantitative Coronary Analysis value was comparatively analyzed by using the workstations produced by 4 companies respectively. Materials and Methods The 20 patients who showed the stenos is of the left anterior descending artery due to thrombi, among the patients, who underwent coronary CT angiography from November 2006 until January 2007, were subject to this study. The CT angiography was performed by using Toshiba Aquilion 64 under the condition of 120kVp, 400mA, 0.4sec tube rotation time. In result, the images of 75, 35, 45 and 90% with the sectional thickness of 0.5mm/0.4mm were taken and were transmitted to the workstation for image reconstruction. Extended brilliance workstation, Advantage workstation, Vitrea workstation, and TeraRecon workstation were used to measuring instruments, and QCA value, i.e., the stenos is degree of left anterior descending artery, was measured. Results 1. With regard to the QCA value based on area value, TeraRecon workstation showed the highest value but the value of PDW was lowest. 2. With regard to the QCA value based on average diameter value, the value of Vitrea workstation was highest but ADW also showed the lowest value. Conclusion QCA values were measured by using the workstations produced by 4 companies respectively; with the consequence that the values become different as to company and TeraRecon workstation and Vitrea workstation did not show conspicuous differences in case the vascular diameter is over 3mm. However, EBW and ADW showed remarkable differences in case the vascular diameter is less than 3mm. In case the vascular area is over 6mm², TeraRecon workstation and Vitrea workstation did not significant differences. When compared to QCA, the ability of workstation to quantitatively assess coronaiy artery diameters and coronary artery stenases is insufficient for clinical purposes
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