• Radiation Oncology Journal
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• 제28권4호
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• pp.224-230
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• 2010

목적: 본 연구에서는 콘빔 CT에서 산란선 제거를 위한 aft-multple-slit (AMS) 시스템을 설계하였다. 예비 연구로서 본 시스템의 효용성을 검증하기 위해 MC 시뮬레이션을 수행하였다. 대상 및 방법: 가상 시뮬레이션은 산란선과 산란선+일차선을 계산할 수 있는 MCNPX의 radiography tally 5를 이용하였다. AMS는 빔의 발산성을 고려한 각이 동일한 아크 형태이고, 길이 방향에서의 산란선을 막는다. AMS의 효용성을 위한 평가는 AMS를 사용하지 않았을 때의 일차선과 산란선을 비교함으로써 수행되었다. 2D projection 영상을 얻기 위해 전체의 AMS는 한번의 캔트리 회전 후 AMS에 의해 가려진 부분의 영상 획득을 위해 다시 한 번 회전하는 구조이다. 결과: 일차선의 2D projection 영상은 모든 AMS의 폭에서 그리고 AMS를 사용하지 않았을 때에도 동일하였으나 일차선+산란선의 2D projection 영상은 slit의 폭에 따라 결과가 변했다. Slit의 폭을 5 mm, 10 mm, 15 mm, 20 mm로 하였을 때 평균 산란성 제거율은 29%, 15%, 9%, 8%였다. 결론: 본 연구에서는 AMS를 이용한 콘빔 CT의 산란선 제거 효과를 평가하였다. MC 시뮬레이션을 이용한 본 시스템의 사전 연구에서는 상당한 산란선 제거 효과를 보여주었다.

• Radiation Oncology Journal
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• 제18권4호
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• pp.221-225
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• 2000

목적 : 본 연구는 1997년에 개정된 비인강암에 대한 AJCC병기 분류법을 1992년의 분류법과 비교하여 새로운 병기 분류법의 신뢰성을 평가하고자 시행되었다. 재료 및 방법 : 1983년부터 1996년까지 서울대학교 병원 치료방사선과에 방사선 치료를 위해 내원한 185명의 조직학적으로 확진되고 원격전이의 증거가 없는 비인강암 환자들을 대상으로 하였다. 이들 환자들에 대하여 의무 기록과 전산화 단층촬영, 자기공명영상을 검토하여 1992년 병기 분류법과 1997년 병기 분류법에 따라 병기를 분류하였고 각 병기 분류법에 따라 생존율을 산출하였다. 결과 : 1992년 분류법과 1997년 분류법에 따른 5년 생존율은 병기 I에서 각각 100$\%$; 병기 II에서는 100$\%$ 와 68.8$\%$; 병기 III에서는 61.4$\%$ 와 63.8$\%$; 병기 IV에서는 61.1$\%$ 와 63.2$\%$ 였다. 각각의 분류법으로 산출한 5년 생존율은 각각의 병기분류법 내에서 병기에 따라 유의한 차이를 보였으나 양 분류법 간에는 병기 II를 제외하고는 통계학적인 차이는 없었다. 결론 : 새로운 비인강암의 AJCC 병기분류법은 이전의 1992년 분류법과 비교하여 신뢰할 수 있을 것으로 생각되나 더 많은 환자를 대상으로 임상적 연구가 진행되어야 할 것으로 생각된다.

• Journal of Acupuncture Research
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• 제17권3호
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• pp.265-276
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• 2000

1997년 11월 1일부터 2000년 6월30일까지 원광대 부속 광주 한방병원 침구과에 요추 추간판 탈출증으로 진단받고 다른 합병증이 발견되지 않은 311례의 입원치료한 환자를 대상으로 보존적 치료를 하였으나, 전혀 호전되지 않았거나 통증만 약간 감소하였던 환자 6례를 분석 검토한 결과, 다음과 같은 결론을 얻었다. 1. 4례에서 large herination이고 2례에서 medium herniation으로 대부분 탈출량이 많았다. 2. 6례 모두에서 하지직거상검사의 각도가 낮았으며 퇴원시까지 호전되지 않았다. 3. X-ray상, 6례 모두에서 straightening되어 있었고, 6례중 3례에서 disc space가 좁아져 있었다. 4. 통증이 심한 4례중 3례에서 측만증이 동반되었다. 발병일이 최소 30일부터 최고 7년까지로 오래되었다. 6. 환자들은 10대에서 30대까지로 연령층이 젊은 편이었다. 7. 입원기간이 최소 32일부터 최대 105일까지로 긴 편이었다. 총괄하면, 상기 6례는 디스크 탈출량이 많았고, 하지직거상검사상 각도가 낮았으며, 연령층이 젊었고, x-ray상 straightening되어 있었다.

• Annals of Clinical Neurophysiology
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• 제18권1호
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• pp.1-6
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• 2016

Background: Moyamoya disease is characterized by a progressive stenosis or occlusion of the intracranial internal carotid artery and/or the proximal portion of the anterior cerebral artery and middle cerebral artery. Whether the onset time was childhood or adulthood, the bony carotid canal diameter might be different, but reflects the size of internal carotid artery passing through the bony carotid canal. In this study, we aimed to identify the relationship between bony carotid canal diameter and clinical manifestation. Methods: 146 consecutive patients diagnosed with moyamoya disease by brain imaging studies were included. We measured the diameter of a transverse portion of bony carotid canal on bone window of a brain computed tomography(CT) image. Patients were divided into two groups, ischemic or hemorrhagic stroke according to clinical manifestation. As a result, 115 patients were included. The Suzuki stage was used as criteria for disease progression. Results: Bony carotid canal diameter was $3.6{\pm}0.5$ (right) and $3.6{\pm}0.4$ (left) in the hemorrhagic stroke group, and $3.7{\pm}0.4$ (right) and $3.6{\pm}0.4$ (left) in the ischemic stroke group. The bony carotid canal diameter of the moyamoya vessels (3.6 mm) was smaller than the diameter of non-moyamoya vessels (3.8 mm), significantly (p = 0.042). However, there was no difference in the collateral patterns and clinical manifestation in a comparison of both groups. Conclusions: In our study, there was no significant difference of clinical manifestations and collateral patterns depend on the bony carotid canal diameter in patients with moyamoya disease. These findings suggest that the clinical presentations of moyamoya disease are not related to the onset time of the disease.

• 대한족부족관절학회지
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• 제21권2호
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• pp.61-65
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• 2017

Purpose: The purpose of this study was to determine the correlation and ratio between the calcaneal length and width for predicting the width of calcaneus. Materials and Methods: A total of 190 feet (190 patients) were included based on computed tomography scans. The length of calcaneus (CL) was measured on the line connecting the center of a circle tangent to the cortical margin in the anterior and posterior parts of the calcaneus in a sagittal plane (W1, W2). The width of the calcaneus was defined as the horizontal line of each part (W1, W2, W3) on the same axial plane. The relationship between the measurement was determined through a correlation analysis. The reliability was assessed based on intraclass correlation coefficients. Results: The CL and widths of calcaneus (W1, W2, W3) had a good positive correlation (r=0.848 [W1/CL], r=0.738 [W2/CL], r=0.769 [W3/CL]; p<0.001). The mean CL and widths ratios were 0.33 (W1/CL), 0.37 (W2/CL), and 0.37 (W3/CL). Using these ratios to estimate the widths by multiplying each ratio by the measured calcaneal length, we found a difference between the estimated calcaneal widths and the actual measured calcaneal widths values was 0.25 mm, 0.43 mm, and 0.16 mm. All measurements showed good-to-excellent inter- and intraobserver reliability. Conclusion: This study analyzed the correlation and ratio between the length and width of the calcaneus. The results will help orthopedic surgeons fixate screws in a stable manner to prevent iatrogenic injuries to the medial neurovascular structures of the calcaneus.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제34권6호
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• pp.473-479
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• 2012

Warthintumor (WT), also known as adenolymphoma or papillary cystadenoma lymphomatosum, was described in 1895 for the first time. It is a common benign tumor of the parotid glands and the second most common neoplasm of the salivary gland, accounting for 5% to 14% of all parotid neoplasm. A 63-year-old man visited our clinic with the complaint of swelling on the right parotid gland. Physical examination showed a 3 cm, firm, well-circumscribed, painless mass on the right mandibular angle. Computed tomography imaging showed a $3.5{\times}2.0{\times}1.6$ cm well-defined cystic mass. WT is histologically characterized by bilayered, oncocystic cell, lymphoid stroma, and cystic space. With these typical cytomorphologic characteristics, the fine-needle aspiration cytology was performed as diagnostic tool before the surgery. The lymphocytes and oncocystic cell were not observed. The lesion was completely excised under general anesthesia. We diagnosed the case as WT, from the surgically excised specimen. We report on the case with a review of the literatures.

• Imaging Science in Dentistry
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• 제46권2호
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• pp.103-108
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• 2016

Purpose: The current study investigates the feasibility of a platform for a nationwide dose monitoring system for dental radiography. The essential elements for an unerring system are also assessed. Materials and Methods: An intraoral radiographic machine with 14 X-ray generators and five sensors, 45 panoramic radiographic machines, and 23 cone-beam computed tomography (CBCT) models used in Korean dental clinics were surveyed to investigate the type of dose report. A main server for storing the dose data from each radiographic machine was prepared. The dose report transfer pathways from the radiographic machine to the main sever were constructed. An effective dose calculation method was created based on the machine specifications and the exposure parameters of three intraoral radiographic machines, five panoramic radiographic machines, and four CBCTs. A viewing system was developed for both dentists and patients to view the calculated effective dose. Each procedure and the main server were integrated into one system. Results: The dose data from each type of radiographic machine was successfully transferred to the main server and converted into an effective dose. The effective dose stored in the main server is automatically connected to a viewing program for dentist and patient access. Conclusion: A patient radiation dose monitoring system is feasible for dental clinics. Future research in cooperation with clinicians, industry, and radiologists is needed to ensure format convertibility for an efficient dose monitoring system to monitor unexpected radiation dose.

• 디지털융복합연구
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• 제12권10호
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• pp.385-390
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• 2014

이 연구의 목적은 복부 MRI검사에 유용한 m-DIXON기법이 기존 e-THRIVE기법에 비해 임상적으로 유용한 검사인지 알아보기 위해 2013년 9월부터 2014년 2월까지 간 질환을 주소로 복부 MRI검사를 시행한 84명을 대상으로 분석하였다. 연구결과에서 SNR은 m-DIXON기법 $90.42{\pm}16.90$, e-THRIVE $60.42{\pm}11.54$로 나타났으며, CNR은 m-DIXON기법 $52.38{\pm}22.58$, e-THRIVE기법 $46.31{\pm}20.25$로 나타났다. 정성적 평가는 m-DIXON기법에서 영상의 질 $4.06{\pm}0.34$, 인공물 $3.64{\pm}0.22$, 지방소거 $4.16{\pm}0.15$로 나타났으며, e-THRIVE기법에서 영상의 질 $3.14{\pm}0.35$, 인공물 $3.06{\pm}0.38$, 지방소거 $3.14{\pm}0.30$으로 나타났다. 결론적으로 복부 MRI검사에서 m-DIXON기법은 e-THRIVE 기법에 비해 정량적 평가 및 정성적 평가에서 우수한 것으로 나타나, 향후 복부질환의 진단에 유용하게 활용할 것을 제안한다.

• Advances in pediatric surgery
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• 제2권1호
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• pp.17-25
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• 1996

Acute pancreatitis(AP) in children is not common but can be associated with severe morbidity rates and its diagnosis is often delayed. Thus, reported mortality rates range from 0 to 78%. We have treated 26 patients with AP from 5 to 17 years of age over the past 17 years. We are intended to assess the relevance of the prognostic criteria used to assess severity of adult AP and to review the etiology, clilical presentation, diagnosis, and management of AP in children. The authors retrospectively reviewed 26 children with AP managed in Kyung Hee University Hospital from 1978 to 1995. Among 26 patients with AP, male were 12, and female were 14. And the mean age of patients was 11.8 years. In 9(34.6%), no definitive cause was identified. Common causes of AP were trauma(23.1%) and biliary tract disease(23.1%). Other etiologies were viral infection(15.4%) and post ERCP(3.8%). The presenting features were abdominal pain(92.3%), vomiting(61.5%), fever(19.2%), submandibular pain(11.5%), and abdominal mass(7.6%). Back pain was rare(3.8%). Abdominal ultrasonographic findings were abnormal in 10 of 16 patients(62.5%) and abdominal CT findings were abnormal for 9 of 9 patients(100%). Seventeen patients(65.3%) were managed conservatively, and nine patients(34.6%) required surgical treatment. There was no mortality. To evaluate the severity of disease, we used the Imrie prognostic criteria used to assess the severity in adult AP. The number of positive criteria was correlated to the duration of hospitalization(r2=0.91) but statistically insignificant(p>0.05). But, the number of positive criteria was correlated to the operative incidence(r2=0.93) and statistically significant(p<0.05). The common causes of AP in children were unknown origin(34.6%), trauma(23.1%), and biliary tract disease(23.1%). Ultrasonography and computed tomography were useful imaging tools of AP in children. The Imrie criteria used to evaluate the severity in adult AP were suspected to be valuable to assess the severity of AP in children.

• Tuberculosis and Respiratory Diseases
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• 제70권4호
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• pp.347-351
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• 2011

We report here an unusual case of pericardial tuberculoma that was misdiagnosed as thymic carcinoma on an imaging study. A 48-year-old woman was referred for evaluation of an anterior mediastinal mass. Computed tomography (CT) scans of the chest displayed cystic masses mimicking thymic carcinoma at the anterior mediastinum. Pericardiotomy and surgical drainage of the cystic masses were done, and pathologic examination of the excised pericardial specimen showed a chronic granulomatous inflammation with necrosis, compatible with tuberculosis. Acid-fast bacilli were also identified in the specimen. After treatment with anti-tuberculosis drugs and steroids, the patient showed clinical improvement. Although tuberculous pericarditis usually presents as pericardial effusion or constrictive pericarditis, it can also present as a pericardial mass mimicking thymic carcinoma on CT. Therefore, we suggest that tuberculous pericardial abscess should be included in the differential diagnosis of a mediastinal mass in Korea, with intermediate tuberculosis prevalence.