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RISS 인기검색어
- 검색키워드
- 저자 : Kumbae Kim (검색결과 3 건)
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Implementation of Abdominal Displacement Measuring Device
Seungwoo Park,Donghoon Lee,Kumbae Kim,Seunghong Hong,Younghoon Ji 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
To indirectly check internal organs movement, the researcher implemented displacement measuring system that can measure abdomen and chest movements. In this paper, the abdominal movements due to necessary living body activities like respiration, etc were used as signal sources. To extract the physical quantity from abdominal expansion or contraction, a spring belt was mounted on the abdomen of the subject and the changes in the spring belt by intestinal organs movement was recorded. The abdominal displacement measuring device implemented using displacement sensor, with a mark attached on the abdomen, was compared with displacement measurement system implemented through trace-back method using CCD camera. As a result, for displacement detection, the two system showed similar pattern. However, the displacement measurement using carmera overcome the inability to mreasure real time due to lapse of time for video processing as the experiment time gets longer. Consequently, it appears that the abdominal data of quanitized abdominal displacement data acquired using the abdominal displacement measurement device implemented as such will give an estimation of the movement inside the intestine.
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박승우,Haijo Jung,KumBae Kim,Donghan Lee,YoungHoon Ji,이레나,SooIl Kwon 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
A target-tracking radiation-therapy (RT) system that tracks the movement of a treatment target resulting from internal organ movement has been developed, and the system was evaluated for effectiveness. The developed radiation-therapy system determines the limit of the MLC (multileaf collimator) movement range with an acquired maximum displacement value of target movement during the radiotherapy planning stage and moves the MLC to continuously detect and synchronize the displacement of the abdominal by using a CCD camera monitoring system during real-time RT treatment. The system consists of a Co-60 teletherapy unit, an abdominal displacement detection system to correlate the movement of internal organs, and a MLC moving stage synchronized with the abdominal displacement. The effectiveness of the RT system was evaluated by analyzing the beam penumbra from the dose distribution on films (Gafchromic EBT) installed within a moving phantom. Penumbra widths (80%/20%) were measured for the nominal left (perpendicular to leaf motion) and right (parallel to leaf motion) directions of the x-axis and the y-axis for a fixed phantom and fixed MLC (3.3 mm/3.5 mm and 3.7 mm/3.1 mm), a moving phantom and a fixed MLC (9.0 mm/8.2 mm and 9.1 mm/8.8 mm), and a moving phantom and a moving MLC (3.7 mm/3.5 mm and 3.7 mm/3.8 mm). Percent area deviations of the 100% to 80% field of the maximum dose for the exposure condition of a fixed phantom and a fixed MLC were a relatively low value of 0.64% and a relatively high value of 15.04%, as compared to the values for a moving phantom and a fixed MLC and for a moving phantom and a moving MLC. With the method to move the MLC by passive synchronization with organ motion, the target-tracking radiation-therapy system was successfully implemented and was evaluated for performance. In future studies, various verification processes should be performed prior to the application of the system in a clinical situation.
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Long Term Follow-up Results of External Beam Radiotherapy as Primary Treatment for Retinoblastoma
Choi, Sang Yul,Kim, Mi-Sook,Yoo, SungYul,Cho, ChulKoo,Ji, YoungHoon,Kim, KumBae,Seo, YoungSeok,Park, Kyung Duk,Lee, JunAh,Lee, Tai-Won The Korean Academy of Medical Sciences 2010 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.25 No.4
<P>The authors reviewed their experiences of external beam radiotherapy (EBR) as an initial treatment in retinoblastoma patients to determine its long-term effect on subsequent tumor control and complications. A total of 32 eyes in 25 patients that underwent EBR for retinoblastoma were reviewed retrospectively. The patients consisted of 21 boys and 4 girls of median age at treatment of 7.1 months. Radiation doses ranged from 35 to 59.4 Gy. The 10-yr ocular and patient survivals were 75.4% and 92.3%, respectively. Nine of the 32 eyes progressed; 7 of these were enucleated and 2 were salvaged by focal treatment. According to the Reese-Ellsworth classification, 4 of 5 eyes of Group II, 13 of 16 Group III eyes, 2 of 4 Group IV eyes, and 5 of 7 Group V eyes were retained, and of the 32 eyes, 13 had visual acuity better than 20/200. Eleven patients experienced a radiation-induced complication. No patient developed a second malignancy during follow-up. Despite the limited number of patients enrolled, EBR may provide a mean of preserving eyeball and vision for some advanced lesions.</P>
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