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침윤성 관상피암의 단순 유방촬영술 소견: 조직학적 등급및 연령과의 관계를 중심으로
신규희 대한영상의학회 1997 대한영상의학회지 Vol.37 No.5
Purpose : To investigate the correlation between mammographic findings of infiltrating ductal carcinoma (IDC), patient age and pathologic grading Materials and Methods : The study included 103 cases of infiltrating ductalcarcinoma in 102 women who during the preceding three years had undergone mammography and surgery. The mammogramswere retrospectively reviewed by two radiologists. The mean age of the patients was 45.2 (range 26-74) years andthe age distribution was seven in the 3rd decade, 37 in the 4th, 29 in the 5th, 24 in the 6th, and six in the 7thor above. Thirty-three lesions were histologic. Grade I, 59 were Grade II and 11 were Grade III. Results : Ten(9.7%) of 103 cases, all of whom were younger than 50, were missed during mammographic diagnosis. On mammograms, primary findings of breast malignancy were found in 54 (74%) of 73 patients younger than 50 and 27 (90%) of 30patients older than 51. Mass with or without microcalcification was found in 45 patients (62%) younger than 50 andin 26 (87%) older than 51. Nine (12%) and 3 (10%) in each age group showed secondary findings. There was nocorrelation between age distribution and histologic grading. Seventy-three percent of Grade I lesions and 78% ofthose of Grade III showed primary findings. Five lesions in each of Grade I and II were missed at mammographicinterpretation, but this was not statistically significant (p=0.250). In all 11 Grade III cases, breast cancerwere manifested as primary findings but this was not statistically significant (p=0.203). Conclusions : Themajority of IDC were detected by mammography, but 9.7% of IDC patients, all younger than 50, were misdiagnosed.Most IDC was manifested as primary findings, particularly in patients aged over 51. There were no differences inpathlogic grading according to age distribution. All histologic Grade III lesions were detected by mammography.to investigate and predict theprognosis of mycoplasma pneumonia according to radiographic pattern. Material and Method : We retrospectivelyreviewed plain chest radiographs of 230 patients in whom mycoplasm pneumonia had been serologically confirmed.Their age ranged from two months to 14 years and two months, and 203(88.3%) were younger than eight years.Radiographic patterns were classified as air space consolidation, bronchopneumonic, interstitial pneumonic ordiffuse mixed infiltrating type. The radiologic resolution period for each type was analysed by the resolution ofsymptoms and normalization of radiologic findings. Results ; The bronchopneumonic type, which was the most common, was seen in 82 patients(35.6%), airspace consolidation in 58(25.2%), interstitial in 55(23.9%), and diffuse mixedin 22(9.57%). In thirteen patients (5.7%), chest radiographs were normal, though the clinical and radiologicresolution period for each type was variable. The mean resolution period of the air space consolidation type was14.5 days, bronchopneumonic, 7.6 days ; interstitial, 10.5 days, and diffuse mixed, 15.6 days. The airspaceconsolidation type needed the longest recovery period, exceeded only by the diffuse mixed type. Conclusion : Thebronchopneumonic type was the most common radiographic pattern of mycoplasma pneumonia. The prognosis of theairspace consolidation type seems to be poorest, since this required the longest recovery period.
척추결핵과 동반된 결핵성 장요근 농양의 경피적 도관배액술의 효과
신규희 대한영상의학회 1997 대한영상의학회지 Vol.37 No.4
Purpose : To evaluate the efficacy of percutaneous catheter drainage of tuberculous abscess associated with tuberculous spondylitis.Materials and Methods : In twelve patients (male : female=1 : 2 ; mean age, 37.3 years) tuberculous abscess wass diagnosed, and was treated by percutaneous abscess drainage(PAD). All patients had either a psoas or iliopsoas abscess and in two, a paravertebral abscess was also present. Four had bilateral lesiosns, one, a unilateral lesion, and one, paravertebral abscesses and bilateral psoas. The size of abscesses ranged from 4$\times$5$\times$12cm to 6$\times$9$\times$30cm ; four were septated and all were lobulated. Using an 8.5-14F catheter, 17 of 18 abscesses were percutaneously drained ; Ultrasound guidance was used in 12 cases, and CT guidance in five.Results : The volume of drainage mater ranged from 150 to 1200 ㏄(mean, 600㏄), and the duration of catheter insertion was 6-48 (mean, 17.4) days. In no patient did significant complications arise during or after drainage, and in all cases, follow-up studies using ultrasound, CT or MRI were performed. The duration of follow-up ranged from 3 to 35 (mean, 15.4) months ; during this time, no recurrence was noted.Conclusion : Chemotherapy alone is sufficient for treating a small tuberculous psoas or iliopsoas abscess, but for a large abscess, adjuvant drainage is necessary.
이중편파레이더와 3차원 분석장을 활용한 기계학습 기반의 지상강수유형 분류
신규희,Joon Jin Song,김권일,정성화,김광호,이규원 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10
겨울철 지상강수유형을 정확히 예측하는 것은 겨울철 강수예보에 있어 중요한 문제이다. 기존의 지상강수유형 분류 방법은 대부분 열역학 변수(층후, 습구온도, 지상온도 등)의 임계치를 이용하였으나, 관측(존데 등)의 경우 시공간 분해능에 한계가 있으며 모델의 경우 모델의 예측 성능에 강수유형 정확도가 전적으로 의존하는 한계가 있었다. 한편, 이중편파레이더 기술이 발전함에 따라 관측을 통한 이중편파변수 기반의 고해상도 수상체분류 방법이 제안되었다. 그러나, 종전의 레이더 기반 수상체분류는 열역학 변수를 배제하고 레이더 변수만을 활용해왔다. 이는 강수유형을 결정짓기 위해 이중편파 변수와 열역학 변수를 함께 사용하는 데 있어 비선형성이 존재하므로 복잡한 분류 기법이 제안되어야하기 때문이다. 이러한 문제를 해결하기 위해 비선형적 관계가 있는 변수 예측에 적합한 기계학습을 활용함으로써 이중편파레이더 변수와 열역학적 변수를 모두 사용하여 지상강수유형을 분류하였다. 본 연구에서는 의사결정나무, 랜덤포레스트, 서포트 벡터 머신 기법을 기반으로 2018-2019 겨울철 강수 사례에 대해 지상강수유형 분류를 수행하였다. S 밴드 레이더 합성장의 이중편파레이더 변수와 3차원 분석장(기온, 이슬점 온도, 기압)으로부터 계산한 열역학 변수를 독립변수로 설정하였다. 기계학습에 사용된 참값은 지상에서 관측한 목측자료이며, 관측 값을 네 가지 유형(비강수, 비, 눈비 혼재, 눈)으로 분류하여 종속변수로 사용하였다. 전체 자료의 80%를 학습자료로 사용하였으며, 20%로 모형을 검증하였다. 분할표를 통해 POD, CSI, FAR를 계산하여 기계학습 방법별로 비교하였다. 랜덤포레스트가 가장 좋은 성능을 나타냈으며, 비의 경우 CSI가 0.85, 눈의 경우 0.84로 높게 나타났다. 눈비 혼재의 경우 0.28으로 나타났으나 이는 현업 보다 향상된 결과이다. 이를 기상청 이중편파레이더 관측망자료에 적용하였으며, 적용결과 지상의 목측자료와 높은 일치성을 보였다.