• 대한융합한의학회지
• /
• 제1권1호
• /
• pp.35-44
• /
• 2021

Objectives: The purpose of this study is to investigate the effect of ultrasound therapy on left knee pain and instability diagnosed with Baker's cyst in a 25-year-old male patient. Methods: Patient was treated with Radio frequency ablation treatment on left knee from Naeseulan (EX-LE4) to Wijoong (BL40). The effect of radio frequency ablation was assessed by Visual Analog Scale (VAS), Western Ontario and McMaster Universities (WOMAC) and Euro Qol-5 Dimension Index (EQ-5D Index). The treatment was executed one time a day everyday form May 28th to June 1st of 2020. Patient was observed from May 26th to June 1st. Results: After five sessions of radio frequency ablation, VAS of left posterior knee pain was improved while no improvement was discovered at left medial knee. In Korean WOMAC scale, only subscale of weight bearing and walking around plain were improved. EQ-5D did not show any improvement. Conclusion: The results suggest that radio frequency ablation treatment can be a valuable option in treating knee pain and daily living function. Further study seems to be needed based on long-term intervention.

• 대한골관절종양학회지
• /
• 제6권1호
• /
• pp.35-40
• /
• 2000

유골 골종은 골의 양성 종양으로 대부분 30세 이하의 환자에 이환되며, 주로 하지의 장관골이 가장 흔히 이환된다. 주 증상으로 통증이 있으며, 밤에 심해지고, 아스피린에 특징적으로 반응하기도 한다. 수술적 제거술이 대부분의 일반적인 치료이며, 전산화 단층촬영하에 제거 술, 전산화 단층촬영하의 드릴을 이용한 파괴술 등을 통한 최소한의 침습적인 수술적 방법이나, 더욱 비침습적인 경피적 방법으로 레이저나 고주파를 발생하는 전극을 이용한 파괴술 등이 시도되고 있고, 수술적 제거술의 대체술로서 고려되고 있다. 이에 저자들은 경골 근위부의 유골 골종을 전산화 단층촬영 투시하에 고주파 치료술을 시행한 1례를 보고하며, 유골 골종의 새로운 치료법들을 고찰해 보고자 한다.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2008년도 추계학술대회 논문집
• /
• pp.641-642
• /
• 2008

• Asian Pacific Journal of Cancer Prevention
• /
• 제14권10호
• /
• pp.6151-6158
• /
• 2013

Radio frequency ablation (RFA) is an effective means of achieving local control of liver cancer. It is a particularly suitable mode of therapy for small and favorably located tumors. However, local progression rates are substantially higher for large tumors (>3.0 cm). In the current study, we report on a mathematical model based on geometric optimization to treat large liver tumors. A database of mathematical models relevant to the configuration of liver cancer was also established. The specific placement of electrodes and the frequency of ablation were also optimized. In addition, three types of liver cancer lesion were simulated by computer guidance incorporating mathematical models. This approach can be expected to provide a more effective and rationale mechanism for employing RFA in the therapy of hepatic carcinoma.

• 대한방사선협회지
• /
• 제27권2호
• /
• pp.137-147
• /
• 2001

For the cancer of the liver, surgery has been the best treatment, while patients who have the cancer of the liver in its early stages or metastatic liver cancer hardly be healed by surgery tend to be treated with PEIT (Percutaneous Ethanol Injection Thera

• Macromolecular Research
• /
• 제12권6호
• /
• pp.608-614
• /
• 2004

Isotactic polypropylene (PP) surfaces were modified with argon and oxygen plasmas using a radio­frequency (RF) glow discharge at 240 mTorr and 40 W. The changes in topography and surface structure were investigated by atomic force microscopy (AFM) in conjunction with specular reflectance of infrared (IR) microspectroscopy. Under our operating conditions, the AFM image analysis revealed that longer plasma treatment resulted in significant ablation on the PP surface, regardless of the kind of plasma employed, but the topography was dependent on the nature of the gases. Specular reflectance IR spectroscopic analysis indicated that the constant removal of surface material was an important ablative aspect when using either plasma, but the nature of the ablative behavior and the resultant aging effects were clearly dependent on the choice of plasma. The use of argon plasma resulted in a negligible aging effect; in contrast, the use of oxygen plasma caused a noticeable aging effect, which was due to reactions of trapped or isolated radicals with oxygen in air, and was partly responsible for the increased surface area caused by ablation. The use of oxygen plasma is believed to be an advantageous approach to modifying polymeric materials with functionalized surfaces, e.g., for surface grafting of unsaturated monomers and incorporating oxygen-containing groups onto PP.

• Macromolecular Research
• /
• 제12권1호
• /
• pp.134-140
• /
• 2004

Semi-crystalline poly(ethylene terephthalate) (PET) film surfaces were modified with argon and oxygen plasmas by radio-frequency (RF) glow discharge at 240 mTorr/40 W; the changes in topography and surface structure were investigated by atomic force microscopy (AFM) in conjunction with specular reflectance of infrared microspectroscopy (IMS). Under our operating conditions, analysis of the AFM images revealed that longer plasma treatment results in significant ablation on the film surface with increasing roughness, regardless of the kind of plasma used. The basic topographies, however, were different depending upon the kind of gas used. The specular reflectance analysis showed that the ablative mechanisms of the argon and oxygen plasma treatments are entirely different with one another. For the Ar-plasma-treated PET surface, no observable difference in the chemical structure was observed before and after plasma treatment. On the other hand, the oxygen-plasma-treated PET surface displays a significant decrease in the number of aliphatic C-H groups. We conclude that a constant removal of material from the PET surface occurs when using the Ar-plasma, whereas preferential etching of aliphatic C-H groups, with respect to, e.g. , carbonyl and ether groups, occurs upon oxygen plasma.

• 한국방사선학회논문지
• /
• 제16권4호
• /
• pp.427-434
• /
• 2022

심방세동 치료는 3D장비를 이용한 고주파 절제술과 냉각 풍선을 이용한 냉각 풍선 절제술이 있다. 두 시술 모두 혈관 조영 장비를 이용해 심장의 구조를 파악한 뒤 진입하는 공통점이 있다. 따라서 시술 시간에 따른 피폭의 영향이 환자와 시술자 모두 위협이 될 수 있다는 단점이 존재하므로 본 연구를 통해 총 절제술 시간과 방사선 피폭 영향 등의 연관성을 확인하고자 한다. 2019년 03월부터 2022년 07월까지 관상 동맥 조영술과 부정맥 시술을 동시에 시행한 41명 환자의 후행적 데이터를 이용하였다. 총 절제술 시간에 대한 범위는 절제술 시작 시점부터 종료 시점까지의 기록된 데이터를 대상으로 하였다. 3D 고주파 절제술 종료 시점은 4곳의 폐정맥에 대해 절제술 시행을 완료한 시점으로 하였고 냉각 풍선 절제술의 경우 전기적 절연에 성공한 데이터를 대상으로 하였다. 총 절제술에 걸린 시간을 분석한 결과 냉각 풍선 절제술에 걸린 시간이 1037.29±103.66 s로 3D를 이용한 고주파 절제술 3485.9±405.71 s 보다 2448.61 s 더 빠른 시술 시간을 보였고 통계적으로 유의했다. (p<0.05) 총 투시 조영 시간을 분석한 결과 3D를 이용한 고주파 절제술 피폭 시간이 2573.75±239.08 s로 냉각 풍선 절제술 피폭 시간 4290.9±420.42 s 보다 1717.15 s만큼 덜 노출됐으며 통계적으로 유의했다. 총면적 선량의 경우 3D 고주파 절제술이 59.04±13.1 uGy/m²로 냉각 풍선 절제술 980.6±658.07 uGy/m²보다 921.56 uGy/m²만큼 저 선량을 나타냈으며 통계적으로 유의했다. 냉각 풍선 절제술의 절연 시간이 3D 고주파 절제술보다 짧은 것으로 보아 환자의 상태가 좋지 않아 빠른 시술이 필요한 경우 냉각 풍선 절제술을 이용하는 방법이 효과적일 것으로 판단된다. 그러나 심방세동이 오래된 환자일 경우 심장의 구조적 변화가 발생할 확률이 높으므로 조작이 어려운 냉각 풍선 절제술 보다 3D 고주파 절제술을 이용해 치료하는 방법이 좋을 것으로 사료된다.

• Bulletin of the Korean Chemical Society
• /
• 제35권6호
• /
• pp.1806-1808
• /
• 2014

We report the successful preparation of gold nanoparticles (Au NPs) using a novel electroreduction process, which is simple, fast, and environmentally friendly (toxic chemicals such as strong reducing agents are not required). Our process allows for the mass production of Au NPs and adequate particle size control. The Au NPs prepared show high biocompatibility and are non-toxic to healthy human cells. By applying radio-frequency (RF) ablation, we monitored the electro-hyperthermia effect of the Au NPs at different RFs. The Au NPs exhibit a fast increase in temperature to $55^{\circ}C$ within 5 min during the application of an RF of 13 MHz. This temperature rise is sufficient to promote apoptosis through thermal stress. Our work suggests that the selective Au NP-mediated electro-hyperthermia therapy for tumor cells under an RF of 13 MHz has great potential as a clinical treatment for specific tumor ablation.