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콘빔CT 촬영 시 mAs의 변화에 따른 피부선량과 영상 품질에 관한 평가
안종호,홍채선,김진만,장준영,Ahn, Jong-Ho,Hong, Chae-Seon,Kim, Jin-Man,Jang, Jun-Young 대한방사선치료학회 2008 대한방사선치료학회지 Vol.20 No.1
Purpose: Cone-beam CT using linear accelerator attached to on-board imager is a image guided therapy equipment. Because it is to check the patient's set-up error, correction, organ and target movement. but imaging dose should be cause of the secondary cancer when taking a image. The aim of this study is investigation of appropriate cone beam CT scan mode to compare and estimate the image quality and skin dose. Materials and Methods: Measurement by Thermoluminescence dosimeter (TLD-100, Harshaw) with using the Rando phantom are placed on each eight sites in seperately H&N, thoracic, abdominal section. each 4 methods of scan modes of are measured the for skin dose in three time. Subsequently, obtained average value. Following image quality QA protocol of equipment manufacturers using the catphan 504 phantom, image quality of each scan mode is compared and analyzed. Results: The results of the measured skin dose are described in here. The skin dose of Head & Neck are measured mode A: 8.96 cGy, mode B: 4.59 cGy, mode C: 3.46 cGy mode D: 1.76 cGy and thoracic mode A: 9.42 cGy, mode B: 4.58 cGy, mode C: 3.65 cGy, mode D: 1.85 cGy, and abdominal mode A: 9.97 cGy, mode B: 5.12 cGy, mode C: 4.03 cGy, mode D: 2.21 cGy. Approximately, dose of mode B are reduced 50%, mode C are reduced 60%, mode D are reduced 80% a point of reference dose of mode A. the results of analyzed HU reproducibility, low contrast resolution, spatial resolution (high contrast resolution), HU uniformity in evaluation item of image quality are within the tolerance value by recommended equipment manufacturer in all scan mode. Conclusion: Maintaining the image quality as well as reducing the image dose are very important in cone beam CT. In the result of this study, we are considered when to take mode A when interested in soft tissue. And we are considered to take mode D when interested in bone scan and we are considered to take mode B, C when standard scan. Increasing secondary cancer risk due to cone beam CT scan should be reduced by low mAs technique.
실험계획법과 수치해석을 연계한 정밀 전자부품 사출성형 공정의 최적설계
안종호,최상련,박근,Ahn, Jong-Ho,Choi, Sang-Ryun,Park, Keun 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.7
The present work concerns the optimal design for injection molding processes by using the design of experiments (DOE) and numerical analysis. The DOE approaches is planned to be able to consider two-way interaction, and have been applied progressively for both mold design and process design. Numerical analyses have been carried out as a design of experiments for mold parameters such as runner specifications and cooling channel configurations. In order to determine optimal process parameters, experiments have been performed for various process conditions with the DOE scheduling. As a result, the quality and productivity of the product have been improved, and the proposed approach can be successfully reflected on the industrial injection molding process of precision electronics parts.
안종호(JH Ahn) 대한산부인과학회 1980 Obstetrics & Gynecology Science Vol.23 No.1
1979sus 1월 4일부터 1979년 10월 31일까지 본병원 산부인과 부인암센타를 수진한 총 2635명중 2동의 smear로 atypical suspicious, positive smear로 판정된 141명을 대상으로 정진율향상을 위한 강세포진가험물채취법을 비교검토한 바, 그 성적을 아래와 같이 요약한다. 검사총원 2635명중 세포진음성이 2494명으로 94.6%이었고 two smear중 atypical, suspicious, positive가 하나 혹은 그 이상 의 경우가 각각 51명(1.9%), 47명(1.8%), 43명(1.6%)으로 abnormal cytology의 총수는 141명(5.4%)이었다. A 및 B smear 등 동시에 2회의 강세포진을 행하였을 시는 A smear 단독으로 행하였을 시보다 0.8∼1.1%의 정진율의 증가를 관 찰할 수 있었다. 이차 세포진을 함으로 의상성 및 양성세포진의 검진율을 13.0%(12 of 92), 그리고 전이상세포진에 대하여는 19.1%(27 of 141) 의 검진율향상을 보았다. Two xonsecutive smears were obtained in 2635 patients during a single visit from Jsn. 4 1977 through Oct. 31 1979 at Gyn. oncology center. Kyungpook Na- tional University Hospital to ascertain the advantage, if any, of second cervical smear. Among them 141 patients were diagnosed as gaving abnormal cytology namely atypical. syspicious and positive smears. Results summarized were as follows. Negative cytology was revealed 94.6% of 2494 patients and in the two smeats one or more smears having atypical suspicious and postive cytology were 1.9% or 51 pts, 1.8% or 47 pts and 1.6% or 43 pts respectively. Total number of abno- rmal cytology were 141 pts or 5.4%. When A and B consecutive vaginal smears were carried out increased detecyion rate of 0.8 to 1.1% was found than A smear alone. Performing the second cervical smear increased the detection rate of suspicious snd positive cytology by 13.0%(12 to 92) and increased the detection rate of all abnormal cytology be 19.1%(27 to 141).
안종호(JH Ahn),권병일(BI Kwon) 대한산부인과학회 1968 Obstetrics & Gynecology Science Vol.11 No.3
Since radioactive substances are widely used in various field. There are increased chances of exposure to accidental irradiation. Various physical changes in human being after accidental exposure to irradiation are extensively studied, but there are few available informations upon stored blood exposed to irradiation. It is an interesting matter to know what changes are manifested in irradiated stored blood. Author studided erythrocyte, leucocyte, platelet count and hematocrit determaination in irradiated stored blood exposed to 500r, 1000r, 2500r, and 5000r with Cobalt. The analyses of the bloods are made in 1st(24 hours), 7th, 14th and 21st day after irradiation and results obtained are as follows: 1. By duration of storage, erythrocyte count of none radiated stored blood(control blood) showed a slight decrease, whereas irradiated bloods showed slightly lower count than that of control blood. The decreasing ratio of control to irradiated bloods in 1st, 7th, 14th, and 21st day manifest roughly same ratio. There are no significant differences of erythocyte count according to dosage of radiation. 2. Leucocyte count of the control blood showed gradually and moderately decreasing number with duration of storage. There are no significant differences of count in irradiated blood and control blood and also no significant difference of count by dosage or irradiation. 3. Platelet count of the control blood showed marked decrease by duration of storage and in irradiated blood, but there are no noticeable differences of count by dosage of irradiation. 4. There are no noticeable differences of hematocrit in control groups and also alteration of hematocrit in irradiated blood group.
급성 부비동염 및 안와 연조직염 소견을 보인 안와, 부비동 미만성 거대 B세포 림프종 1예
안종호(Jong Ho Ahn),지미정(Mijung Chi) 대한검안학회 2017 Annals of optometry and contact lens Vol.16 No.4
Purpose: To report a case of paranasal diffuse large B-cell lymphoma with orbital invasion that presented with acute sinusitis and orbital cellulitis. Case summary: A 78-year-old man presented with right periorbital swelling that stated 2 days after after gingival abscess treatment 2 weeks ago. Under suspicion of acute sinusitis and orbital cellulitis, systemic antibiotics and anti-inflammatory medication was started but the symptoms worsened. We performed incisional biopsy of orbital lesion via transcaruncular approach. Based on histopathological examination, the orbital mass was diagnosed as diffuse large B-cell lymphoma. Conclusions: We report the case of paranasal lymphoma with orbital extension presenting with acute sinusitis and orbital cellulitis from gingival abscess history and acute onset. This condition should be considered for patients with acute sinusitis and orbital cellulitis that aggravates for a short period of time.
복부 대동맥류에서 발치 후 발생한 범발성 혈관내 응고증 1 예
안종호 ( Jong Ho Ahn ),이정열 ( Jeong Yeol Lee ),노희종 ( Hee Jong Noh ),주민하 ( Min Ha Joo ),전만조 ( Man Jo Jeon ),윤병인 ( Byung In Yun ),장흥문 ( Heung Moon Chang ) 대한내과학회 2001 대한내과학회지 Vol.61 No.5
N/A Disseminated intravascular coagulation (DIC) is the result of a severe underlying disorder thatinitiates massive activation of the coagulation system. We report an unusual case of 79- year - old man who developed DIC after tooth extraction in abdominal aortic aneurysm. He was referred to our hospital because of persistent bleeding after tooth extraction. Physical examination indicated a pulsating mass in abdomen. Abdominal computerized tomography (CT) scan revealed 70 mm diameter aneurysm of the abdominal aorta, extending from the renal infrahilar level to the common iliac artery, and his coagulation profile showed the features of DIC by revealing thrombocytopenia, hypofibrinogenemia, and increased level of fibrinogen degradation product (FDP). After he had received blood component therapy including fresh frozen plasma and continuous intravenous heparin infusion (4,800 U/day), the bleeding diathesis and coagulopathy improved. He refused to have definitive surgery for the aneurysm. (Korean J Med 61:572- 576, 2001)