관동맥질환에서 저밀도 지단백 입자 크기의 분포

임효영,김인숙,승기배,강동헌,전두수,장기육,박준철,이수영,홍순조,최규보 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.8

자발성 뇌실내출혈 환자에서 임상적 -전산화단층촬영상소견의 상관관계

황선철,김범태,장재칠,주교성,신원한,최순관,변박장 대한신경외과학회 1998 Journal of Korean neurosurgical society Vol.27 No.6

구강악안면영역의 3차원 CT 영상 재형성시 역치 및 불투명도에 대한 연구

최문경,이삼선,허경회,이원진,최순철 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.1

Purpose : This study was designed to determine a proper threshold value and opacity in three-dimensional CT volume rendering of oral and maxillofacial area. Materials and Methods : Three-dimensional CT data obtained from 50 persons who were done orthognatic surgery in department of oral and maxillofacial radiology of Seoul National University retrospectively. 12 volume rendering post-processing protocols of combination of threshold (100HU, 150HU, 221HU, 270HU) and opacity (58%, 80%, 90%) were applied. Five observers independently evaluated image quality using a five-point range scale. The results were analyzed by receiver operating characteristic curves, ANOVA and Kappa value. And three oromaxillofacial surgeons chose the all images that they thought proper clinically in the all of images. Results : Analysis using ROC curves revealed the area under each curve which indicated a diagnostic accuracy. The highest diagnostic accuracy appear with 100HU and 58% opacity. and the lowest diagnostic accuracy appear with 221HU and 58% opacity that are being used protocol in department of oral and maxillofacial radiology of Seoul National University. But, no statistically significant difference was noted between any of the protocols. And the number of proper images clinically that chosen by three oromaxillofacial surgeons is the largest in the cases of protocol 8 (221HU, opacity 80%) and protocol 11 (270HU, opacity 80%) in one after the other. Conclusion : Threshold and opacity in volume rendering can be controled easily and these can be causes of making an diagnostic accuracy. So we need to select proper values of these factors.

비소가 가견 치아와 치조골에 미치는 영향

최순철 慶北大學校 齒科大學 1989 慶北齒大論文集 Vol.6 No.1

About 0.1㎎ of the arsenic trioxide was inserted into the pulp chambers of the third and the fourth right premolars in 10days. The arsenic trioxide was removed after 1 week in 3 dogs and after 2days in 7dogs. The serial standardized periapical radiographs using XCP instruments and resin bite blocks were taken twice in a week to the fourth week and weekly thereafter for a total of 8 weeks. All radiographs were evaluated by the visual examination on the viewbox. The obtained results were as follows; 1) In 3 dogs removing the arsenic trioxide after 1 week, all the third and the fourth right premolars were dislodged without significant radiographic change in the adjacent bone tissue. 2) In 7 dogs removing the arsenic trioxide after 2 days, the first radiographic sign of the bone destruction was observed at 7 and 10 days. 3) Variable types of alveolar bone destruction, external root resorption, periapical lesions and sequestrum formation were observed.

소방 2급응급구조사의 성인 심폐소생술에 대한 숙련도 분석

최용철,이창섭,왕순주 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.1

Purpose: The purpose of this study is to predict a reasonable direction to design a pertinent educational program in the future by evaluating an adult CPR (Cardiopulmonary Resuscitation) skill per-formed by EMTs engaged in fire services organization and comparing the CPR success rate of Factors as like a duty place and licensed year. Methods: We studied CPR skill by the use of a CPR manikin(Skillmeter Resusci Annie, Laerdal company). The study population consisted of 320 EMTs. Every EMT performed four cycle after investigating the manikin for 2 minutes. We regarded chest compression with 100 times in a minute as the 100% success rate. We analysed the skill of chest compression, ventilation and chest Compression times- success rate by the records printed in the CPR paper. Results: The average success rate of chest compression was 59.42 f 29.26% and ventilation 49.22 129.65%. The success rate of manual CPR was different between chest compression and ventilation. Also the success rate of chest compression times was high relatively as a 87.32+9.14%(p=0.000). For the CPR skill, ventilation was lowest as 49.22%. The factors such as duty place and licensed year did not influence the CPR success rate (p>0.001). Conclusion: We could have conclusion that CPR training should be shared more time in ventilation than in chest compression. Also we could reach to a conclusion that it is important to increase the times of CPR training for improving the accuracy of CPR and that the continuing education of CPR training frequency might be more than four times in a year.

파노라마 방사선사진에 있어서 하악골 위치에 따른 상의 변화 (Ⅱ)

최순철 慶北大學校 齒科大學 1988 慶北齒大論文集 Vol.5 No.1

The author has observed image distortion in the panoramic radiographs of the dry mandible using Panelipse Ⅱ. The radiopaque steel balls were inserted into the apical region of the incisors, premolars, the 1st molar, the second molar, the 3rd molar and the region of mandibular foramen. The dry mandible was placed in five position as follows, Position Ⅰ. The standard position Position Ⅱ. Bodily movement of the mandible 1㎝ anteriorly Position Ⅲ. Bodily movement of the mandible 1㎝ posteriorly Position Ⅳ. Bodily movement of the mandible 1㎝ to the right Position Ⅴ. Bodily movement of the mandible 1㎝ to the left The results as fallows; When compared with the image in the standard position: 1) In position 2, horizontal dimension was decreased, especially in the region of incisors and premolars. 2) In position 3, there was a severe horizontal blurring in the region of incisors and premolars. The horizontal dimensional change was more prominent 3) In Position 4, horizontal dimension was decreased. 4) In position 5, there were decreased horizontal dimension in the region of incisors, severe blurring in the region of premolar and 1st molar, and increased horizontal dimension in the other areas. 5) In all positions, vertical dimension was not greatly changed.

응급구조사 보수교육의 교과과정 개발에 관한 연구

최용철,이창섭,왕순주 한국화재소방학회 2003 한국화재소방학회논문지 Vol.17 No.1

응급구조사는 매년 그들이 가지고 있는 지식과 기술을 유지하고 신장시키기 위해 일정시간 보수교육을 받도록 되어 있다. 보수교육과정은 급변하는 의료환경에 대응할 수 있도록 편성·운영되어야 한다. 그러나 우리나라에는 합리적인 교육과목 및 교과내용을 포함하는 표준교과과정이 없다. 따라서 본 연구는 표준교과과정을 개발하기 위해 선진국의 다양한 보수교육과정들을 분석하고 교육욕구에 대한 설문을 실시하였다. 개선방안은 다음과 같다 : (a) 교과목의 수를 늘리고 내용을 세분화시켜야 한다. (b) 과목별 합리적인 수업시간이 배정되어야 한다. (c) 현장실무에 적용가능한 교과과정이 편성되어야 한다. (d) 보수교육의 회수를 늘려서 교육기회를 확대하여야 한다. (e) 교육여건을 개선하고 교육결과에 대한 평가와 환류가 이루어져야 한다. 이러한 개선방안들을 토대로 하여, 본 연구에서는 보수교육의 표준교과과정(안)을 제시하였다. As EMTs(Emergency Medical Technician), they will be required to attend a certain number of hours of continuing education each year to maintain, update, and expand their knowledge and skills. Continuing Education courses must be designed to keep up with the rapid changes in medicine. But, there are no standard CE curricula including reasonable subject matters and contents in this country. This paper analyzed many different CE curricula in advanced countries and examined the survey for educational needs to develop a standard CE curriculum. The following alternative plans to improve was proposed : (a) The subject matters should be enlarged and the contents subdivided. (b) The reasonable school hours of each subject matter should be allocated. (c) The applicable curriculum to the field affairs should be designed. (d) The frequency of CE should increased to expand an educational chance. (e) The educational circumstances should be improved, the educational outcomes be evaluated and flowed back. On the basis of the above alternatives plans, this paper proposed a model for the standard CE curriculum.

口內全顎標準放射線寫眞 撮影時 撮影法과 필름維持法에 따른 撮影上의 失策

崔甲植,卞鍾秀,崔珣哲 大韓口腔顎顔面 放射線學會 1986 Imaging Science in Dentistry Vol.16 No.1

75명의 치과대학 4학년생들이 촬영한 300예의 구내전악표준방사선사진들을 촬영법과 필름의 유지법에 따라 필름들을 피촬영자의 엄지나 검지로 유지하고 등각법으로 촬영한 경우(Ⅰ군), 필름을 Rinn Snap-A-Ray기구로 유지하고 등각법으로 촬영한 (Ⅱ군), 필름을 Rinn XCP 기구로 유지하고 Short cone에서 평행법으로 촬영한 경우(Ⅲ군), 필름을 Rinn XCP기구로 유지하고 Long cone에서 평행법으로 촬영한 경우 (Ⅳ군)으로 분류하여 75예의 구내전악표준방사선사진으로 구성된 각 군의 재촬영의 조사하여 각 군에서 가장 많이 나타난 실책의 종류와 부위, 그리고 구내전악표준방사선사진 1회당 평균재촬영매수에 대해 아래의 결과를 얻었다. Ⅰ군 : Incorrect film placement(47.8%)와 상악 견치부(26.9%)였으며 0.89매였다. Ⅱ군 : Incorrect film placement(44.0%)와 상악대구치부(28.6%)였으며 1.12매였다. Ⅲ군 : Incorrect film placement(79.1%)와 상악대구치부(32.0%)였으며 2.05매였다. Ⅳ군 : Incorrect film placement(67.7%)와 상악대구치부(30.7%)였으며 1.69매였다. 평균재촬영매수에서는 같은 촬영법인 Ⅰ군과 Ⅱ군간에서와 Ⅲ군와 Ⅳ군간에서는 유의한 차가 나타나지 않았으나(P>0.05),등각촬영법의 군(Ⅰ+Ⅱ)보다 평행촬영법의 군(Ⅲ+Ⅳ)에서 0.86매 많았다(P<0.01). The purpose of this study was to investigate the numbers and causes of retakes in 300 complete mouth radiographic surveys made by 75 senior dental students. According to radiographic techniques and film holding methods, they were divided into 4 groups: GroupⅠ: Bisecting-angle technique with patient's fingers. GroupⅡ: Bisecting-angle technique with Rinn Snap-A-Ray device. GroupⅢ: Paralleling technique with Rinn XCP instrument(short cone) GroupⅣ: Paralleling technique with Rinn XCP instrument(long cone) The most frequent cause of retakes, the most frequent tooth area examined, of retakes and average number of retakes per complete mouth survey were evaluated. The obtained results were as follows: GroupⅠ: Incorrect film placement (47.8%), upper canine region, and 0.89. GroupⅡ: Incorrect film placement (44.0%), upper molar region, and 1.12. GroupⅢ: Incorrect film placement (79.2%), upper molar region, and 2.05. GroupⅣ: Incorrect film placement (67.7%), upper molar region, and 1.69. The average number of retakes per complete mouth survey of paralleling technique (GroupIII+IV) was higher than that of bisecting-angle technique (GroupI+II)(p<0.01). There was no differnce between GroupⅠand Group Ⅱ, and between Group Ⅲ and Group Ⅳ in the average number of reatkes per complete mouth survey(p>0.05).

하악 제1대구치의 치근 만곡에 영향을 주는 요인

최항문,이원진,허민석,이삼선,김정화,최순철,박태원 대한구강악안면방사선학회 2006 Imaging Science in Dentistry Vol.37 No.1

Purpose : To find the cause of root curvature by use of panoramic and lateral cephalometric radiograph. Materials and Methods : Twenty six 1st graders whose mandibular 1st molars just emerged into the mouth were selected. Panoramic and lateral cephalometric radiograph were taken at grade 1 and 6, longitudinally. In cephalometric radio graph, mandibular plane angle, ramus-occlusal plane angle, gonial angle, and gonion-gnathion distance (Go-Gn distance) were measured. In panoramic radio graph, elongated root length and root angle were measured by means of digital subtraction radiography. Occlusal plane-tooth axis angle was measured, too. Pearson correlations were used to evaluate the relationships between root curvature and elongated length and longitudinal variations of all variables. Multiple regression equation using related variables was computed. Results : The Pearson correlation coefficient between curved angle and longitudinal variations of occlusal plane-tooth axis angle and ramus-occlusal plane angle was 0.350 and 0.401, respectively (p<0.05). There was no significant correlation between elongated root length and longitudinal variations of all variables. The resulting regression equation was Y=10.209+0.208X_(1)+0.745X_(2) (Y: root angle, X_(1): variation of occlusal plane-tooth axis angle, X_(2): variation of ramus-occlusal plane angle). Conclusion: It was suspected that the reasons of root curvature were change of tooth axis caused by contact with 2nd deciduous tooth and amount of mesial and superior movement related to change of occlusal plane. (Korean J Oral Maxillofac Radiol 2006; 36 : 55-62)

우리 나라 구강악안면방사선학 교육 현황

최순철 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.1

Although x-ray had been used in Dental Clinic and taught as Roentgenology as a part of other lectures, the independent lecture was established at Seoul National University in 1953. The first independent Department was separated from the Department of Oral Surgery at Seoul National University in 1963. Nowadays, there are 6 national and 5 private dental schools in South Korea. Each dental school has a Department of Oral and Maxillofacial Radiology, which fulfills its role in student education and clinical service. What is specially noteworthy is that 8 of the 11 dental schools have changed or will change from the 2+4 year system to 4+4 year system (postgraduate course). The curriculum has also been or is being amended according to this change. Although the contents of courses for Oral and Maxillofacial Radiology are not much different among dental schools, the methods and structure of education are various. We have to do a systematic and comprehensive analysis of the present educational methods and structure of Oral and Maxillofacial Radiology and need to seek the new and more suitable ones based on competency.