X-CARE 사용시 안구와 유방의 선량 감소 효과와 영상 평가에 관한 연구

오현식(Hyun Sik Oh),유형태(Hyung Tae Yoo),남윤철(Yoon Cheul Nam),김문찬(Moon Chan Kim),한동균(Dong Kyoon Han) 대한CT영상기술학회 2011 대한CT영상기술학회지 Vol.13 No.2

목적 감수성이 높은 표재성 장기인 안구와 유방의 선량감소 효과가 있는 X-CARE를 대상으로 두부와 흉부 검사 시 선량감소효과와 영상의 화질을 평가하여 보고하고자 한다. 대상 및 방법 CT 장비는 Siemens사의 Dual Source Somatom Definition Flash를 사용하였으며, organ dose 측정을 위해 Female Alderson Radiation Therapy Phantom과 유리선량계를 사용하였다. 두부 검사시 안구의 표면, 두부 전면부, 후면부에서 측정하였으며, X-CARE를 사용하지 않을 때와 사용했을 때의 선량을 각각 2번씩 측정하여 비교하였다. 흉부 검사시에는 유방과 흉부의 전면부, 중간부, 후면부의 선량을 AEC 모드의 사용여부에 따라서 X-CARE를 사용하지 않을때와 사용했을 때의 선량을 각각 2번 측정하여 비교하였다. 영상의 화질 평가는 ACR 팬텀을 사용하여 얻어진 영상을 ImageJ 분석 프로그램을 이용하여 직선성과 균일도를 평가하였다. 통계분석은 Minicab을 통해 2 Sample t-test로 분석하여 선량의 유의성을 확인하였다. 결과 두부 검사시 안구의 표면선량과 전면부 선량은 X-CARE의 사용전에 비해 사용후에는 35.2%, 14.6% 감소하였으며, 후면부에서는 9.1% 증가하였다. 흉부 검사에서 AEC를 적용하지 않으면서 X-CARE를 사용하면 사용 전에 비해 유방, 흉부 전면부, 중간부의 선량은 각각 30.0%, 11.3%, 3.8% 감소하여 유의한 선량감소를 타나냈다(p<0.05). 그러나 후면부에서는 13.6%로 증가하였다. AEC를 적용하면서 X-CARE를 사용하면 사용전에 비해 유방, 흉부 전면부의 선량이 27.8%, 11.0% 감소하여 유의한 감소 효과를 나타냈다(p < 0.05). 그러나 흉부중간부와 후면부에서는 각각 1.4%, 4.5% 증가하였다. 영상의 화질 평가는 직선성과 균일도 모두 ACR에서 정한 기준 범위에 포함되었다. 결론 X-CARE는 영상의 화질 변화 없이 감수성이 높은 표재성 장기인 안구와 유방에 선량 감소 효과를 나타낼 수 있는 방법으로 여성과 소아 검사에 있어서 적극적인 사용을 권고한다. I. Purpose To measure absorbing dose reduction and evaluate image quality by glass dosimeter to eyeball and breast which are high sensitive superficial organs when examining head and chest using X-CARE. II. Meterial and Methods Dual Source Somatom Definition Flash of Siemens Company was usedfor the CT scan and Female Alderson Radiation Therapy Phantom and glass dosimeter were used for organ dose evaluation. ACR phantom was used for image quality evaluation and program Minicab was used for statistics analysis. For organ dose evaluation, we compared eyeball skin dose during head exam and the dose examined two times whether using X-CARE or not to the frontal and occipital partial of the head. For chest exam, we compared the dose examined two times whether using X-CARE or not to breast dose and the frontal, middle, rear side of chest following to use AEC mode or not. Using image j analysis program, we evaluated the linearity and uniformity the image gotten by ACR phantom. Through out Minitab, we confirmed dose significance by analyzing 2 Sample r-test. III. Result For dose evaluation of head exam, eyeball skin dose and the frontal dose show 35.2%, 14.6% reduction comparing before use and after use, the rear side shows 9.1% growth. To not apply AEC of chest exam, after use of X-CARE show the breast front, middle, rear dose were decreased 30.0%, 11.3%, 3.8% and the rear side increased 13.56% comparing before use. To apply AEC,however, after use of X-CARE show the breast dose and the frontal dose shows 27.8%, 11.0% reduction and the middle and rear side shows 1.4%, 4.5% growth. For image quality evaluation, it contains the standard range of ACR phantom The dose evaluated at the head shows all small differences(p < 0.05) and the breast dose and the front and rear side show small differences(p < 0.05), the middle partial shows no small differences(p > 0. 05) without the use of chest AEC. When the breast does and the frontal dose show small differences(p < 0.05) with the use of AEC, the middle and rear side show no small differences(p > 0. 05). IV. Conclusions X-CARE is the good way to show to eyeball and breast which are high sensitive superficial organswithout the image changing I think.

인공안구 구현을 위한 병렬 구조의 3자유도 회전 로봇 개발

박성령(Sung Ryung Park),양승한(Seung Han Yang) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.6

In this research, three degree-of-freedom parallel spherical robot is developed for an artificial eyeball. The proposed system is comprised of a moving and a base plate, three prismatic actuators, and a ball joint for an angular movement of the moving plate. The vector analysis is employed to investigate the relationship between positions of the actuators and a pose of the moving plate. The required ranges for every actuators are calculated using the derived inverse kinematics in regard to the combination of two different levels for the size of the system component. Then the size of every components is determined from the analyzed trend. PI controller is employed for the position control of the moving plate. Finally the proposed system is verified using an arbitrary path of the angular movement.

Reduction of Entrance Surface Dose Depending on Shielding Methods for Panoramagraphy

Jung-Hyun Choi(최정현),Sung-Chul Kim(김성철),Dong-Kyoon Han(한동균) 대한방사선과학회 2015 방사선기술과학 Vol.38 No.3

한국에서의 파노라마장치의 사용비율은 치과대학병원에서 17.8%, 치과병원에서 24.8%, 치과의원에서 31.4%로 구내촬영장치 다음으로 많이 사용하고 있는 검사 방법으로, 치아교정 및 인플란트 등의 수요증가에 따라 파노라마 검사는 지속적으로 늘어나고 있는 추세이다. 본 연구에서는 파노라마 검사에 불필요한 안구와 갑상선부위의 선량을 감소시키기 위해 납안경 및 납차폐체를 이용해 보았으며, 납안경으로 차폐를 한 경우 안구의 ESD가 41.4% 감소되었으며, X선관 부위 쪽을 차폐납으로 차 폐할 경우에는 ESD의 47.3%를 감소시킬 수 있음을 알게 되었다. eyeball의 불필요한 선량저감을 위하여 임상에서 는 lead glass를 사용하는 방법이 있으며, 제조사에서는 eyeball부위 피폭을 줄일 수 있는 제어장치를 적극 활용할 필요성이 있는 것으로 나타났다. Panoramagraphy was the second most used intraoral radiography utilized in Korea, resulting in 17.8% in university dental hospitals, 24.8% in dental hospitals, and 31.4% in dental clinics. Depending on increased demand like orthodontics and implant, panoromagraphy tends to consistently increase. This study were used lead glasses and lead shielding to reduce unnecessary radiation to the eyeballs and thyroid. ESD was 41.4% when radiation was shielded with the lead glasses while reducing 47.3% of ESD by shielding the X-ray tube area with shielding lead. There was no statistically significant difference. The lead glasses is appropriated to reduce unnecessary radiation exposure to the eyeballs.

반도체 나노박막에 기반한 생체모사 디바이스 제작 및 그래핀 기반 물질의 광/전기적 특성 분석에 대한 연구

정인화(Inhwa Jung) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11

Reduction of Entrance Surface Dose Depending on Shielding Methods for Panoramagraphy

최정현,김성철,한동균 대한방사선과학회 2015 방사선기술과학 Vol.38 No.3

Panoramagraphy was the second most used intraoral radiography utilized in Korea, resulting in 17.8% in university dental hospitals, 24.8% in dental hospitals, and 31.4% in dental clinics. Depending on increased demand like orthodontics and implant, panoromagraphy tends to consistently increase.This study were used lead glasses and lead shielding to reduce unnecessary radiation to the eyeballs and thyroid. ESD was 41.4% when radiation was shielded with the lead glasses while reducing 47.3% of ESD by shielding the X-ray tube area with shielding lead. There was no statistically significant difference. The lead glasses is appropriated to reduce unnecessary radiation exposure to the eyeballs.

Development of Eyelid Strain Sensing Setup for Eye Movement Measurement

주동현,박재성,이혜경,천권수,양인철,박우태 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.5

江戶人의 신체에 대한 好奇心과 視覺遊戱

李美林 중앙대학교 일본연구소 2012 日本 硏究 Vol.0 No.32

The drawings introduced Western medical images to the Edo era Japan. This encounter of art represented through medicine allowed Japan to show its admiration for American civilization during early Japanese modern times. It may be said that a sense of impending crisis between the west and the Orient stimulated their productive will. On the other hand, only a small area of Japan, principally the Dejima section of Nagasaki was opened to the West during the Edo period. However this small opening to the West succeeded in allowing the people of Edo to absorb western culture and knowledge. For example, Kyoden Santo who was a painter during Edo drew ghost like images pests such as mosquitoes or fleas while looking through a microscope <松梅竹取談> seemingly a parody of Western anatomy. Similarly 〈The skeleton island〉 drawings by Kyosai Kawabe and Hiroshige Andou drawings are wonderful. The device of parody, which was inherent to western culture, was vulgar but was accepted as advanced knowledge.