• 방사선산업학회지
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• 제11권1호
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• pp.47-54
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• 2017

Compared to other occupations, there is a greater risk of exposure to radiation due to the use of radioisotopes in nuclear medicine for diagnostic evaluations and therapy. To consider ways to reduce exposure dose for those in nuclear medicine involved in injection work and elution work among radiation workers as well as for sanitation workers and trainees among frequent workers an investigation into exposure dose and situational analysis from changes in yearly exposure dose evaluations, changes in work environment and changes in forms of inspection were conducted. Exposure dose measurements were taken by using EPD MK2 worn during working hours for one injection worker, one elution worker, two sanitation workers, and one trainee at a general hospital in the Seoul area for three days from July 18th to 20th 2016. Radiation from radioisotopes which are a part of nuclear medicine can significantly affect not only radiation workers who deal with radioisotopes directly but also frequency works as well. According to this study the annual dose limit for elution workers and injection workers were considered safe as the amount of exposure was not large enough to have a significant effect. The limits of this study consist in the duration of this study and the quantity of participants. Also there was a limitation of the measurement device involving accumulated exposure, where the EPD MK2 cannot check the changes in exposure according to a particular activity.

• Journal of Yeungnam Medical Science
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• 제25권2호
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• pp.85-91
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• 2008

Intensity-modulated radiation therapy (IMRT) is believed to be one of the best radiation treatment techniques. IMRT is able to deliver fatal doses of radiation to the tumor region with minimal exposure of critical organs. It is essential to have a comprehensive quality assurance program to assure precision and accuracy in treatment, due to the character of IMRT. We applied quality assurance technique to the Eclipse treatment planning system and sought to determine its effectiveness in patient treatment planning. An acrylic phantom, film, and an ionization chamber were used in this study.

• 한국광학회:학술대회논문집
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• 한국광학회 2001년도 하계학술발표회
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• pp.154-155
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• 2001

A laser system for therapy of cancer is proposed in this paper. In order to accuracy and statistical output control we used the constant current control method and designed the power source to protect the resonator from the over -current, rush-current and electrical fault. The most important things are the radiation type for cancer therapy in laser system, we developed the radiation type of cw, pulse, and burst pulse. The experimental result show that laser beam power increase linearly from 100mW to 300mW for input current increasing and the exposure time.

• 한국방사선학회논문지
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• 제17권3호
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• pp.305-314
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• 2023

의료기술의 발전과 방사선 치료 장비의 발전으로 세기변조방사선치료와 같은 고 정밀 방사선치료의 빈도수가 증가하였다. 정밀하고 복잡한 치료계획에서 방사선 치료 시 영상유도방사선치료는 필수가 되었다. 특히 선형가속기에 진단용 영상장비의 도입으로 CBCT스캔이 가능해졌으며 이는 3차원 이미지를 통해 환자의 자세를 검·교정할 수 있게 되었다. 보다 정밀한 환자 자세의 재현이 가능해졌지만, 영상획득과정에서 환자에게 전달되는 피폭선량은 무시할 수 없다. 방사선 치료분야에서 방사선 방호최적화는 필요하며 피폭저감화를 위한 노력은 필요하다. 하지만 3차원 CBCT영상 획득 시 피폭저감화를 위해 촬영조건을 변경하여 촬영할 경우 환자의 위치정렬을 할 수 없을 정도의 화질이나 인공물이 발생해서는 안 된다. 본 연구에서Rando phantom을 활용해 각 촬영조건별 영상을 스캔하고 평가하였다. 100 kV, 80 mA, 25 ms, F1 filter 180° 조건에서 가장 높은 SNR이 나타났다. 관전압, 관전류가 높아질수록 Noise가 감소했으며 보우타이필터는 높은 관전류에서 최적의 효과를 나타냈다. 실제 스캔된 이미지를 토대로 환자위치정렬이 모든 촬영조건에서 가능했으며 가장 낮은 SNR을 나타낸 70 kV, 10 mA, 20 ms, F0 filter 180° 조건에서 충분히 환자자세정렬을 위한 영상유도방사선치료는 가능함을 확인하였다. 본 연구에서 촬영조건에 따른 영상평가를 실시하였으며 피폭 저감화를 위해 낮은 관전압과 관전류, 작은 회전각 스캔이 선량 저감화에 효과적일 것으로 보인다. 이를 토대로 CBCT촬영 시 환자의 피폭선량을 가능한 낮게 해야 할 것이다.

• Nutrition Research and Practice
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• 제12권1호
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• pp.41-46
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• 2018

BACKGROUND/OBJECTIVES: Exposure of the normal lung tissue around the cancerous tumor during radiotherapy causes serious side effects such as pneumonitis and pulmonary fibrosis. Radioprotectors used during cancer radiotherapy could protect the patient from side effects induced by radiation injury of the normal tissue. Delphinidin has strong antioxidant properties, and it works as the driving force of a radioprotective effect by scavenging radiation-induced reactive oxygen species (ROS). However, no studies have been conducted on the radioprotective effect of delphinidin against high linear energy transfer radiation. Therefore, this study was undertaken to evaluate the radioprotective effects of delphinidin on human lung cells against a proton beam. MATERIALS/METHODS: Normal human lung cells (HEL 299 cells) were used for in vitro experiments. The 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide (MTT) assay assessed the cytotoxicity of delphinidin and cell viability. The expression of radiation induced cellular ROS was measured by the 2'-7'-dicholordihydrofluorescein diacetate assay. Superoxide dismutase activity assay and catalase activity assay were used for evaluating the activity of corresponding enzymes. In addition, radioprotective effects on DNA damage-induced cellular apoptosis were evaluated by Western blot assay. RESULTS: Experimental analysis, including cell survival assay, MTT assay, and Western blot assay, revealed the radioprotective effects of delphinidin. These include restoring the activities of antioxidant enzymes of damaged cells, increase in the levels of pro-survival protein, and decrease of pro-apoptosis proteins. The results from different experiments were compatible with each to provide a substantial conclusion. CONCLUSION: Low concentration ($2.5{\mu}M/mL$) of delphinidin administration prior to radiation exposure was radioprotective against a low dose of proton beam exposure. Hence, delphinidin is a promising shielding agent against radiation, protecting the normal tissues around a cancerous tumor, which are unintentionally exposed to low doses of radiation during proton therapy.

• 한국융합학회논문지
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• 제13권1호
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• pp.1-12
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• 2022

본 연구에서는 웹기반 인지재구조화 교육과 결합된 VR 노출 프로그램이 사회 불안 감소에 미치는 영향을 확인하였다. 실험 집단(n=12)은 웹기반 인지 재구조화 교육과 가상현실노출 프로그램(VRET)에 4회기 참석하였고, 비교집단(n=15)은 동일한 가상현실노출 프로그램(VRET) 이외에 연설기법에 대한 교육을 받았다. 두 집단 모두 프로그램 참여 전,후에 자기보고식 증상심각도 척도와 암묵적 해석 편향을 측정하였으며, 4주 후에 추후평가를 실시하였다. 프로그램 직후 실험집단과 비교집단 모두 사회적 불안 수준이 감소하였으나, 4주가 지난 후 실험집단에서만 긍정적인 해석 편향이 증가하였고, 부정적인 해석 편향이 감소하였으며, 감소된 사회불안 수준이 유지되었다. 이러한 결과는 VRET 치료효과를 증진시키기 위해서 자신의 생각에 대한 객관적 점검을 시도해 볼 수 있는 인지적 개입이 결합될 필요가 있음을 시사한다.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 2002년도 추계학술대회 논문집
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• pp.187-192
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• 2002

Research has shown that many smokers experience an increase in the desire to smoke when exposed to smoking-related cues. Cue exposure treatment (CET) refers to the manualized, repeated exposure to smoking-related cues, aimed at the reducing cue reactivity by extinction. In this study, we constructed a virtual reality system for evoking a desire of nicotine, which was based on the results of a Questionnaire of Nicotine-craving. And we investigated the effectiveness of the virtual reality system as compared to classical device (pictures). As a result, we reached the conclusion that virtual reality elicits more craving symptoms than the classical devices.

• 한국임상수의학회지
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• 제17권1호
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• pp.298-298
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• 2000

Seven years old male lion in Everland Zoo has three fractured canine tooth. To avoid the risk of a possible fracture with pulp exposure after restroration of largest abration defects, endodontic therapy was performed. The pulp chamber was filled with calcium hydroxide, zinc oxide cement and gutta percha. We also installed the Crown prosthesis was installed in fractured canine tooth to protect the tooth and to improve the cosmetics and function of the tooth. The lion could eat in one day and there were no any signs of dental problem. It is the obvious prophylactic procedure for wild animal is the inclusion of an oral examination at every opportunity to handle the animal. It is considered that crown prosthesis after endodontic therapy was useful for maintaining normal physiological function and for provention of additional fracture or complication.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제16권3호
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• pp.185-189
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• 2013

Corticosteroid (budesonide) nebulizer therapy is commonly performed. Its side effects have been considered as being safe or ignorable. The authors present a case of esophageal candidiasis in a healthy female adolescent who was treated with budesonide nebulizer therapy a few times for a cough during the previous winter season. This child presented with dysphagia and epigastric pain for 1 month. Esophageal endoscopy showed a whitish creamy pseudomembrane and erosions on the esophageal mucosa. Pathologic findings showed numerous candidal hyphae. She did not show any evidence of immunodeficiency, clinically and historically. The esophageal lesion did not resolve naturally. The esophageal lesion completely improved with the antifungal therapy for 2 weeks; the symptoms disappeared, and the patient returned to normal health. It is important that frequent esophageal exposure to topical corticosteroids application can cause unexpected side effects.

• 동의신경정신과학회지
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• 제26권1호
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• pp.49-61
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• 2015

Post traumatic stress disorder (PTSD) is an anxiety disorder that usually occurs after suffering from a psychological trauma that can not threatening events, which is one of the individual's subjective pain and their families and the larger society due to the chronic disease burden results. Treatment with a medication, as well as cognitive behavioral therapy (CBT), exposure therapy, prolonged exposure therapy (PE), eye-movement desensitizing, and reprocessing (EMDR) are preferentially performed, including psychotherapy. Korean medical psychotherapy consists of a wide range of manual therapy, but it does not have systematically screening limits. This study was developed by Korean medical psychotherapy program for PTSD, and it was carried out as a preliminary clinical trial for validity. The Korean medical psychotherapy program for PTSD consists of four stages as follows: building chapter of safety, flow and send, accept, and integration. Based on this preliminary clinical study of PTSD, seven patients were treated for 2 hours per week for 5 weeks. We report the meaningful results gained by observing the changes in IES-RK points, questionnaire on five-faceted mindfulness, quality of life, anxiety, depression, insomnia, hwabyung scale, HRV, and EEG, before and after the Korean medical psychotherapy program.