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.

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

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)

임신 4개월의 흔적자궁 자연파열 1예

안종호(JH Ahn),이태호(TH Lee),박일수(IS Park),김유정(YJ Kim) 대한산부인과학회 1976 Obstetrics & Gynecology Science Vol.19 No.12

A case of sponataneous rupture of rudimentray uterine horn with 4 month gestation which was diagnosed as a rupture of tubal gestation is presented and some articles, concerned to this subject were reviewed briefly

기후변화에 따른 지표수의 수온 영향평가

안종호 ( Jong Ho Ahn ),한대호 ( Dae Ho Han ) 한국물환경학회 2010 한국물환경학회지 Vol.26 No.1

이상질세포진의 정진률향상을 위한 가검물 채취법의 비교

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).

u-Health시스템 구축을 위한 RFID/USN의 ZigBee무선통신 연구

안종호(Ahn, Jong-Ho),최성(Sung Choi) 한국산학기술학회 2008 한국산학기술학회 학술대회 Vol.- No.-

RFID 태그에 통신 기능이 부가되고 점차 주위 환경을 감지하는 센싱 기능이 부가되면, 능동적으로 정 보를 처리하는 지능형 초소형 스마트 센서 네트워크로 발전되어 현재의 고정된 개체 인식 코드 획득 수준에서 다기능 태그에 의한 상황인지 처리 수준으로 진화하여, 개체간 통신 기능을 갖춘 지능형 USN으로 발전할 것으로 전망 된다. ZigBee는 기기간 센서 네트워크를 구성, 단순 제어와 관리를 수 행할 수 있는 WPAN의 최적의 기술로 평가 받고 있으며 저 전력, 저가 등의 장점 등으로 시장 성장 성이 높은 기술이다. 유/무선 인프라를 확보하고 있는 우리는 ZigBee를 기존, 또는 현재 구축중인 유 무선 네트워크와 연결해 다양한 유비쿼터스 서비스를 개발할 수 있는 최적의 테스트베드 환경을 갖추 고 있으므로 u-Health의 기반에 꼭 필요한 기술이다.

직접여과공정을 위한 전처리공정의 제어 및 여과효율 평가

안종호(Jong Ho Ahn),채선하(Seon Ha Chae),이동주(Dong Ju Lee) 大韓環境工學會 2000 대한환경공학회지 Vol.22 No.8

여재구성에 따른 탁질입자 제거특성 및 효율 비교

안종호(Jong Ho Ahn),윤재흥(Jae Heung Yoon) 大韓環境工學會 2000 대한환경공학회지 Vol.22 No.5

국내산(國內産) 농산부산물(農産副産物) 발효사료(醱酵飼料)를 급여(給與)한 재래산양(在來山羊)의 사료섭취량(飼料攝取量) 및 소화율(消化率)

안종호 ( Ahn Jong-ho ),유황종 ( Yoo Hwang-jong ),김현진 ( Kim Hyun-jin ),조익환 ( Jo Ik-hwan ),이주삼 ( Lee Ju-sam ) 한국유기농업학회 2000 韓國有機農業學會誌 Vol.8 No.3

In this study, by-products of rice bran, rice hull, bean curd dregs and food waste were fermented with different ratios of 26,26,34 and 14% respectively and the experimental diets were prepared mixing it with various ratios of commercial diets (fermented feed : commercial feed ; A 80 : 20,B 70 : 30,C 60 : 40,D 50:50). In Experiment I, feed intake, nutrients digestibilities and nitrogen retention were investigated and body weight gain in Experiment Ⅱ. 1. For chemical composition of experimental diets, crude protein contents were 13.73, 13.78,14.45 and 15.14% in A, B,C and D respectively and the contents of crude fat and crude fiber were highest in A as 8.66 and 27.82% respectively. 2. Dry matter intakes were significantly higher (P<0.05) in A(362.06g/d) and C(358.49g/d) than B and D. Intakes of crude protein and crude fat were not significantly different (P〉0,05) among treatments however those of crude fiber and crude ash were significantly higher (P〈0.05) in A(101.47g/d). 3. Dry matter digestibilities in the range of 53.38~68.81% in all treatments have shown the highest value in C of 60% fermented feed plus 40% commercial diet but the lowest in A of 80% of fermented feed plus 20% commercial diet (1<0.05). 59.85% of digestibility of crude protein in A was also lowest among all treatments (P<0.05). 4. 8.47g/d of nitrogen intake in C was recorded highest (P<0.05) however the highest nitrogen retention was marked in D of 50% fermented feed plus 50% of commercial diet due mainly to lower excretion of nitrogen through feces. 5. The data of live weight gain in Experiment n has not been shown as a result since the proper daily gain of body weight was achieved only in D as 88.89g/d and the goats in other treatments have shown frequent diarrhea. However, neglecting the animals with diarrhea, higher amounts of concentrates in the diets (C and D) showed the tendency of higher weight gain. 6. In this study, feeding 60% fermented feed manufactured with domestic agricultural by-products of rice bran, rice hull, bean curd dregs and food waste to Korean native goats have shown satisfactory results of intake and digestibility and it indicates that utilization of domestic agricultural by-products in goats could be improved by the process of fermentation. However it’s effects on body weight gain and nitrogen retention were below than expected. Different sources of feedstuff for fermentation may result in different performances of animals. However, to draw overall conclusion from this study, 50~60% of fermented feed can be recommended in the case of mixing with concentrates.