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송군식 대한영상의학회 1985 대한영상의학회지 Vol.21 No.3
Endodermal sinus tumors(EST) are generally recognized as a germ cell tumors with extraembryonic differentiation that resemble the endodermal sinus of the rat placenta. Like other germ cell tumors the primary EST may either occur in the gonads of in specific extragonadal sites. CT is the most accurate study in delineating the extent of primary and metastatic lesions particularly in the pelvis. Recently authors experienced six cases of the pathologically proven extragonadal endodermal sinus tumors in children and retrospecitively analyzed the radiological findings including the CT. The results were as follows: 1. Of the 6 cases of extragonadal EST, the primary lesion presented in the sacrococcygeal resion in 5 patients and liver in one patient. 2. There were 4 females and 2 males. Of the sacrococcygeal lesions 3 were females and 2 were males. 3. The age of presentation ranged from 9 months to 3 years of age (mean age = 21 months) 4. Conventional radiographic study of the sacroco cygeal lesion showed presacral, retrorectal soft tissue mass without calcification which extended into the buttock. CT revealed well circumscribed enchancing soft tissue mass with irregular central low density areas. 5. Primary EST of the liver revealed ill-defined inhomogeneous mixed echogenic mass (ultrasound) and ill-defined low density mass (CT). Angiography showed hypervascular mass with areas of necrosis and no evidence of portal vein invasion. A-V shunting was not present. 6. Regional lymph node metastasis was present at the time of diagnosis in 2 cases of sacrococcygeal EST. 7. Local recurrence of tumor was noted in 2 patients with sacroccygeal lesion after surgery and chemotherapy.
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Metrizamide를 이용한 신경계질환의 진단 -임상적 유용성과 부작용-
송군식 대한영상의학회 1985 대한영상의학회지 Vol.21 No.6
The retrospective analysis on the clinical utility and side effects of the metrizamide myelography and metrizamide. CT-cisternography were made in 292 patients. Metrizamide CT proved valuable in the diagnosis of intraspinal neoplasms with total block in myelography, demonstrating the upper margin of the neoplasms in a large number(75%) of the cases with neoplasm. Metrizamide study also clearly showed the nature and extent of the syringomyelia, and arachnoid cyst. Metrizamide CT was also helpful in the diagnosis of spinal stenosis, spinal trauma and infectious disease of the spine. The most common side effects were transient minor meningeal irritations (headache, nausea, vomiting and dizziness) which persisted no more than 48 hours in most of the patients. Five patients developed major complications such as grand mal seizure, toxic psychosis or aseptic meningitis.
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디지털 영상과 필름 - 스크린 영상의 화질비교 - 흉부.두부.비뇨기계의 정상 해부학적 구조물을 중심으로 -
송군식 대한영상의학회 1987 대한영상의학회지 Vol.23 No.1
Digital image aquisition and display is widely used in computed tomography, ultrasonography, digital subtraction angiography, nuclear emedicine and magnetic resonance image. But most of the radiological examinations performed in radiology department are made by using conventional film-screen system. The development of the digital radiography system is essential if totally digitized radiology department is desired. The advantages of digitizing the radiographic information are usually discussed in terms of PACS, furthemore there aremany other advantages such as contrast modification, spatial filtering, subtraction and superimposition of the images through the image processing by computer. Currently several approaches are under development or in clinical use, the most promising approach is the use of imaging plate composed ofphotostimulable phosphors such as barium fluorohalide crystal read with a He-Ne laser to produce digital radiographic images. Another promising approach is s an projection radiography. The authors performed the clinical study of the normal anatomic sturcture rating thoseon a scale of 0 to 3 and obtained the following results. Normal contrast digital images are comparable to conventional film-screen fimages, but the images, but the images of structures such as skin, subcutaneous fat, musculoskeletal systems, nasopharynx and larynx, trachea and main bronchi, mediastinal is its wide exposure latitude and reduced radiation to patients. Digital radiography system will be very useful in the examinations using portable unit and fluoroscopy.
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송군식 대한영상의학회 1985 대한영상의학회지 Vol.21 No.1
The pulmonary aspergillosis is a group of three separate diseases, comprising invasive aspergillosis, aspergilloma, and allergic bronchopulmonary aspergillosis, or a disease process in which one of three entities overlap with another process such as mucoid impaction, pulmonary infiltration with eosinophilia, bronchocentric granulomatosis, micorgranulomatous hypersensitivity, or asthma. The radiological findings of 24 cases of pulmonary aspergilloss diagnosed and treated at Seoul National University Hospital during the past 7 years were analyzed retrospectively. The results were as follows: 1. Final diagnosis of 24 cases of pulmonary aspergillosis was aspergilloma in 16 cases, invasive aspergillosis in 2 cases, variant form of allergic bronchopulmonary aspergillosis in 3 cases, and endobroncnial aspergillosis in 3 cases. 2. The underlying causes of the aspergilloma were healed tuberculous cavity in 6 cases, bronchiectasis in 8 cases, and no underlying dause were found in 2 case . All the 16 cases of aspergilloma were correctly diagnosed without difficultly by demonstrating the intracavitary mass or air meniscus. 3. Radiological findings of the invasive aspergillosis in kidney transplant patients were multiple round nodules with early cavitation and formation of aspergilloma which shows slowly progressive cavitation over 13 months in one case, and diffusely scattered miliary nodules with occasional cavitation in the other case. 4. Classic allergic bronchopulmonary aspergillosis were not found in our series but variant form of ABPA was found in 3 young female patients. All the three patients shows some degree of central bronchiectasis and combined aspergilloma was found in 2 cases. 5. Three patients diagnosed as endobronchial aspergillosis-saprophytic infection of aspergillus in the bronchial tree-by bronchoscopic biopsy shows nonspecific radiological findings.
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흉부영상에서 디지털영상처리술의 모의병변 검출능에 관한 실험적 연구
송군식 대한영상의학회 1992 대한영상의학회지 Vol.28 No.6
The receiver operating characteristic (ROC) curve analysis were done to evaluated the effects of digital image processing techniques on the detectability of simulated pulmonary nodules and cysts in chest radiographs. Image processing techniques used were the contrast inversion, unsharp masking, and filtered equalization method. Simulated pulmonary nodules and cysts were generated by the computer program using Turbo-C language for personal computer. Each processed and unprocessed image sets of sixty images with pulmonary nodules and cysts and one hundred and twenty normal images were analyzed by three board-certified radiologists and four senior residents training in diagnostic radiology by five rating category. Area under the ROC curve was calculated using the trapezoidal rule. Mean area under the ROC curve of seven radiologists of the unprocessed image was 0.6360 $\pm$ 0.0583, contrast inversion was 0.5660 $\pm$0.0478, unsharp masking was 0.7534 $\pm$ 0.0355 and filtered equalization as 0.6915 $\pm$ 0.0472. Unsharp masking (p<0.01) and filtered equalization image (p<0.05) was statistically significant than unprocessed image. Digital chest radiographs processed by the unsharp masking method significantly increased the detectability of simulated pulmonary nodules and cysts overlapped with mediastinum and pulmonary cysts in free lung fields.
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