우리나라의 흉부엑스선검사에서의 환자선량 권고량

정명진,이광용,이병영,김혁주,임효근 대한영상의학회 2010 대한영상의학회지 Vol.62 No.6

Purpose: To establish recommendation criteria for the determination of patient dose for a plain chest radiography examination (PCR) by surveying the examination protocols for the performance of PCR, determining patient doses, and analyzing the relationship between these protocols and patient dose. Materials and Methods: We surveyed the examination protocols for the PCR of 95 radiography units in 82 institutes. We measured the patient dose as the surface entrance dose (SED) in these unites using an anthropomorphic phantom. We ultimately compared the results of the survey against several significant criteria. Results: The protocol for performing a PCR in Korea was 111 ± 17 kVp and 7.0 ± 6.7 mAs. The mean and median SED were 0.30 ± 0.27 mGy and 0.22 mGy, respectively. The third quartile value was 0.34 mGy, while the variability between the types of institutes and the average values of SED were 0.27 ± 0.17 mGy, 0.28 ± 0.29 mGy, and 0.34 ± 0.31 mGy for primary, secondary, and tertiary hospitals, respectively. The types of units include the average values of SED, which were 0.18 ± 0.11 mGy, 0.37 ± 0.28 mGy, and 0.32 ± 0.31 mGy for film/screen, CT, and digital radiography systems, respectively. Conclusion: The average patient dose during PCR in Korea was 0.30 mGy/exam. In perspective, the diagnostic reference level of patient dose for postero-anterior chest radiography was 0.34 mGy/exam. 목적: 환자방어의 최적화를 위하여 우리나라의 흉부엑스선검사 시 환자선량 실태를 측정하고 이로부터 환자선량 권고 수치를 확립하고자 하였다. 대상과 방법: 국내 각급 의료기관 82개소의 95개 흉부 엑스선 촬영장치를 대상으로 흉부엑스선 검사 시 촬영조건 및 진단영상정보를 수집하고 기관 표준 검사 조건을 원용한 검사법으로 인형 팬텀에 대한 입사선량을 측정하였다. 입사선량 중 상향 3/4 순위에 해당하는 선량을 환자 피폭선량 진단참고준위 권고 수치로 설정하였다. 결과: 대상 기관들이 흉부엑스선검사 시 사용하는 검사조건은 관전압 평균 111 ± 17 kVp, 관전류량 7.0 ± 6.7 mAs이었다. 해당 장비들로부터 흉부엑스선검사 시 환자가 받는 피폭선량은 입사선량 기준으로 평균 0.30 ± 0.27 mGy이었으며 제1사분위수 0.13 mGy, 제2사분위수 0.22 mGy 제3사분위수 0.34 mGy이었다. 의료기관 규모별 분류 시 1차 의료기관 평균 0.27 ± 0.17 mGy, 2차 의료기관 0.28 ± 0.29 mGy, 3차 의료기관 0.34 ± 0.31 mGy이었으며, 장비 종류별 분류 시 필름-스크린 시스템 0.18 ± 0.11 mGy, CT 0.37 ± 0.28 mGy, digital radiography 0.32 ± 0.31 mGy이었다. 결론: 우리나라 의료기관의 흉부엑스선검사 시 평균 환자선량은 후전면 촬영 1회당 0.30 mGy이며, 후전면 흉부엑스선검사 시 의료기관에 권고할 수 있는 환자 피폭선량 진단 참고준위 수치는 0.34 mGy이었다.

성남시 중고 가전제품의 재사용에대한 소비자 의식 활성화

정명진,이혜임,김진영 凡石學術奬學財團 1999 凡石學術論文集 Vol.3 No.-

건강보험 적용에 따른 다학제 암 진료의 의료비 분석

정명진,전병율 대한의사협회 2021 대한의사협회지 Vol.64 No.10

Background: Cancer has been the leading cause of death in Korea for more than 40 years. As the aging population in the country increases, this trend is expected to continue. Cancer care is also being subdivided into specialties according to the development of medical technology. This division of care has made it difficult for a single physician to set up a complete cancer treatment plan. As a result, the call for multidisciplinary care has risen. Multidisciplinary cancer care allows physicians to share opinions and choose optimal patient treatment plans across multiple specialties. In August 2014, the Ministry of Health and Welfare designated a set number of approved multidisciplinary treatments and has included them under its health insurance coverage. As a result, multidisciplinary care is rapidly increasing. Current Concepts: An analysis on cancer care was conducted from 2014 to 2018, which examined the average medical expenses, hospitalization costs, and surgery costs per person according to therapeutic modality. Findings showed that multidisciplinary care decreased the overall cost of medical care in cancer patients compared to segmented care provided by single specialty physicians. Discussion and Conclusion: This study predicted that multidisciplinary care would be effective in reducing medical expenses. Cancer patients do not need to be treated by individual subspecialty physicians when personalized care treatment plans through a multidisciplinary approach is possible. The results of this study show that the Korean government should expand health insurance premium support and coverage for multidisciplinary cancer care

소형 교육용 로보트를 위한 제어시스템의 개발 ( The Development of a Control System for Small Educational Robot )

정명진,오상록,박종헌,장철 대한전자공학회 1987 대한전자공학회 학술대회 Vol.1987 No.01

췌장선암의 이중기 나선식 CT:동맥기와 지연기 영상의 비교

정명진 대한영상의학회 1995 대한영상의학회지 Vol.32 No.3

Purpose: To evaluate the efficacy of the arterial phase of dynamic spiral CT in the detection of pancreatic adenocarcinoma compared with the late phase. Materials and Methods: Two phase spiral CT images of seventeen patients with pathologically proven pancreatic ductal adenocarcinomas were compared retrospectively. CT scans were performed with 5 mm collimation at 1:1 pitch table speed. Images of arterial and late phases were obtained at 35 seconds and 180 seconds after initiation of administration of 100 mL of contrast material(3 mL/sec), respectively.Images of the arterial phase were compared with those of the late phase. Results: Images of the arterial phase showed sufficient contrast between the tumor and adjacent pancreatic parenchyma in 12 cases, insufficient in fourcases, and no significant contrast in one case. Images of the late phase showed sufficient contrast in five cases, insufficient in five cases, and no significant contrast in seven cases. Images of the arterial phase was superiorto that of the late phase in 12 patients(70.6%). In six of this 12 patients, only the images of the arterial phase showed contrast between the tumor and the adjacent parenchyma. The images of late phase showed only one case of three metastasis detected on the images of the arterial phase. Conclusion: The arterial phase of spiral CT issuperior to the late phase that is comparable with conventional CT in the detection of pancreatic adenocarcinoma.

폐의 호흡 역동적 CT:초기 임상 경험

정명진 대한영상의학회 1995 대한영상의학회지 Vol.33 No.4

Purpose : We applied spiral CT to evaluate the dynamic changes of regional ventilation of the lung in normalsubjects and abnormal patients. Materials and Methods : This study includes normal subjects (n=5) and patientswith chronic obstructive pulmonary disease (n=4), small air-way disease (n=3), diffuse panbronchiolitis (n=4), andtracheobronchial tuberculosis (n=2). Time-continuous scan data at a fixed level during forced vital capacitymaneuver(10-12 seconds) were obtained and images were reconstructed retrospectively by using 0.67 second scan dataper image. The reconstructed images were displayed in a cine mode. Time-density curves were plotted and werecorrelated with clinical diagnosis. Results : in normal subjects, mean attenuation difference between fullinspiration and full expiration was 145. 8HU and mean time interval between 20% expiration and 80% expiration was2.04 seconds. in chronic obstructive lung disease, mean attenuation difference between full inspiration and fullexpiration was 21.2HU and mean time interval between 20% expiration and 80% expiration was 3.63 seconds. In smallair-way disease, mosaic-pattern hyperlucency and normal portion of lung showed mean attenuation differencesbetween 20% expiration and 80% expiration to be 49.8HU and 167.0HU, respectively. In diffuse panbronchiolitis,centrilobular region and normal portion of lung showed mean attenuation differences between 20% expiration and 80%expiration to be 35.4HU and 79.3HU, respectively. Conclusion : Respiratory dynamic CT is an updated techniquewhich enable imaging of the functional status of the lung parenchyma. It may be useful in differentiation andquantitation of variable obstructive lung diseases.

나선식 정량적 CT:폐절제후 폐기능 예측에의 유용성

정명진 대한영상의학회 1995 대한영상의학회지 Vol.33 No.4

Purpose : We evaluated the usefulness of quantitative spiral CT to predict postoperative lung function inpatients undergoing pulmonary resection. Materials and Methods : Fourteen patients in whom pneumonectomy orsegmentectomy were performed underwent preoperative chest spiral CT and pulmonary function test(PFT). Six patientsunderwent postoperative follow-up PFT. Ten patients underwent preoperative radioisotope(RI) lung perfusion scan.Preoperative CT data were postprocessed with contiguous pixel method ranged from -910HU to -500HU to quantifytotal functional lung volume(TFLV) and regional volume to be resected(RFLV). Postoperative lung function waspredicted by following formula; Predicted postoperative PFT value = preoperative PFT x (1-RFLV/TFLV). CT predictedvalue was compared with postoperative measured PFT value and those value of RI perfusion scan. Results : CTpredicted values were very close to postoperative measured value and RI predicted value, and were correlated wellwith postoperative measured values (FVC: r=0.988, P<0.001; FEV1: r=0.994, P<0.001) and RI predicted values (FVC:r=0.976, P<0.001; FEV1: r=0.974, p<0.001). Conclusion : Quantitative spiral CT was useful to predict postoperativelung function and could be an effective alternative to RI perfusion scan.

췌장의 이중기 나선식 CT : 동맥기와 문맥기의 비교

정명진 대한영상의학회 1996 대한영상의학회지 Vol.35 No.5

Purpose : To compare the images of arterial phase (AP) and portal venous phase (PVP) in the evaluation ofconspicuousness of lesion and peripancreatic arterial and venous opacification in pancreatic diseases. Materialsand Methods : Dual-phase spiral CT was performed in 37 patients with pancreatic adenocarcinoma and 21 patientswith pancreatitis. CT scans were performed with 5mm collimation at 1 : 1 pitch table feed. Images of AP and PVPwere obtained at 30 and 65 seconds after administration of contrast material, was initiated. Using a gradingsystem, images were analalysed for conspicuousness of lesion and vascular opacification(grade 1=good, grade2=fair, grade 3=poor). Results : In pancreatic adenocarcinoma, 35 and 36 of 37 cases showed low attenuation on APand PVP, respectively. With regard to conspicuousness of tumour, PVP(mean grade : 1.24) was superior AP(mean grade: 1.43), but not significantly(p=0.0745). In arterial opacification, AP(mean grade : 1.03) was significantlysuperior to PVP(mean grade : 1.30, ; p=0.0051). In venous opacification, PVP(mean grade : 1.19) was significautlyto AP(mean grade : 2.41 ; p<0.0001). In pancreatitis, 14 and 15 of 21 cases showed localized hypo-attenuatinglesion indicating necrosis or fluid collection, on AP and PVP, respectively. With regard to conspicuousness oflesion, PVP(mean grade : 1.61) was superior to AP(mean grade : 1.81), but not significantly(p=0.1088). In arterialopacification, AP(mean grade : 1.05) was significantly superior to PVP(mean grade: 1.38 ; p=0.0180). In venousopacification, PVP(mean grade : 1.10) was significantly superior to AP(mean grade : 2.33 ; p=0.0005). Conclusion :For the diagnosis and staging of pancreatic disease, dual-phase spiral CT in arterial and portal venous phase maybe recommendable. The portal venous phase of spiral CT seems, however, to be superior to the arterial phasebecause the lesion is more conspicuous and there is venous opacification.

영어교육과 번역

정명진 한국영어교육학회 1979 ENGLISH TEACHING(영어교육) Vol.- No.18

CST-트리를 채택한 Mint 시스템을 이용한 멀티미디어 콘텐츠 검색 개선

정명진,조성제 (사)디지털산업정보학회 2013 디지털산업정보학회논문지 Vol.9 No.3

Multimedia contents’ searching methods in existing mobile computer environment tend to be brought with many over heads when attempting to search data in large bulks. The MINT system has been studied to resolve such problem. However, MINT system delivers many over heads by searching multimedia contents through applying B-Tree. The suggested method is said to be CST-MCR searching system based on CST-Tree. The specific characteristic of this method is improved MINT system by applying CST-Tree’s index. The result of capacity evaluation came out with improved capacity of 4.27% from MINT system and CST-MCR methods in average. Conclusively, it has been proven that the suggested method is superior.