• Journal of Multimedia Information System
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• 제7권2호
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• pp.157-164
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• 2020

Considering the frustration affordability level of college entrants and investigating the frustration tolerance of undergraduates in Shenyang City University, this paper provides the basis for the research of improving frustration tolerance of undergraduates through quantitative research results and applies film therapy to the frustration regulation of college students by discussing the role of film therapy in improving frustration affordability ability of college entrants. This paper has concluded that the necessary of improving the frustration tolerance of college students in Northeast China and the feasibility of the film therapy programs on improving the frustration tolerance of college students in Northeast China. Meanwhile, this paper shows that the principle of film selection in film therapy should be based on the requirements of the aesthetics of the film industry in the IT environment. This paper provides a reference for refining the target of film therapy for film therapists to better apply film and television psychotherapy technology, and a basis for the film therapy activity program; Furthermore, it also has a certain reference significance for film and television media workers.

• 한국의학물리학회지:의학물리
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• 제33권4호
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• pp.80-87
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• 2022

Purpose: Proton therapy has different relative biological effectiveness (RBE) compared with X-ray treatment, which is the standard in radiation therapy, and the fixed RBE value of 1.1 is widely used. However, RBE depends on a charged particle's linear energy transfer (LET); therefore, measuring LET is important. We have developed a LET measurement method using the inefficiency characteristic of an EBT3 film on a proton beam's Bragg peak (BP) region. Methods: A Gafchromic EBT3 film was used to measure the proton beam LET. It measured the dose at a 10-cm pristine BP proton beam in water to determine the quenching factor of the EBT3 film as a reference beam condition. Monte Carlo (MC) calculations of dose-averaged LET (LET_d) were used to determine the quenching factor and validation. The dose-averaged LETs at the 12-, 16-, and 20-cm pristine BP proton beam in water were calculated with the quenching factor. Results: Using the passive scattering proton beam nozzle of the National Cancer Center in Korea, the LET_d was measured for each beam range. The quenching factor was determined to be 26.15 with 0.3% uncertainty under the reference beam condition. The dose-averaged LETs were measured for each test beam condition. Conclusions: We developed a method for measuring the proton beam LET using an EBT3 film. This study showed that the magnitude of the quenching effect can be estimated using only one beam range, and the quenching factor determined under the reference condition can be applied to any therapeutic proton beam range.

• 한국멀티미디어학회논문지
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• 제20권1호
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• pp.93-100
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• 2017

In our life, stories are ubiquitous. Such stories of our lives are shared during counseling and psychotherapy. Modern storytelling is not limited to image and digital media. It encompasses various media, including offline contents such as festivals and theme parks. Furthermore, it is also utilized in film therapy. Film therapy refers to all the methods that utilize films and image media in counseling and psychotherapy. This paper summarizes and analyzes film therapy that utilizes storytelling. As the result of this analysis, it was found that we could gain insight into the identity of patients and their treatment through the storytelling that utilized films.

• 한국의학물리학회지:의학물리
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• 제28권4호
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• pp.144-148
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• 2017

When a high density metallic implant is placed in the path of the proton beam, spatial heterogeneity can be caused due to artifacts in three dimensional (3D) computed tomography (CT) scans. These artifacts result in range uncertainty in dose calculation in treatment planning system (TPS). And this uncertainty may cause significant underdosing to the target volume or overdosing to normal tissue beyond the target. In clinical cases, metal implants must be placed in the beam path in order to preserve organ at risk (OARs) and increase target coverage for tumors. So we should introduce Ti-mesh. In this paper, we measured the lateral dose profile for proton beam using an EBT3 film to confirm dosimetric impact of Ti-mesh when the Ti-mesh plate was placed in the proton beam pathway. The effect of Ti-mesh on the proton beam was investigated by comparing the lateral dose profile calculated from TPS with the film-measured value under the same conditions.

• 한국의학물리학회지:의학물리
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• 제30권4호
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• pp.112-119
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• 2019

Purpose: The advantages of ocular proton therapy are that it spares the optic nerve and delivers the minimal dose to normal surrounding tissues. In this study, it developed a solid eye phantom that enabled us to perform quality assurance (QA) to verify the dose and beam range for passive single scattering proton therapy using a single phantom. For this purpose, a new solid eye phantom with a polymethyl-methacrylate (PMMA) wedge was developed using film dosimetry and an ionization chamber. Methods: The typical beam shape used for eye treatment is approximately 3 cm in diameter and the beam range is below 5 cm. Since proton therapy has a problem with beam range uncertainty due to differences in the stopping power of normal tissue, bone, air, etc, the beam range should be confirmed before treatment. A film can be placed on the slope of the phantom to evaluate the Spread-out Bragg Peak based on the water equivalent thickness value of PMMA on the film. In addition, an ionization chamber (Pin-point, PTW 31014) can be inserted into a hole in the phantom to measure the absolute dose. Results: The eye phantom was used for independent patient-specific QA. The differences in the output and beam range between the measurement and the planned treatment were less than 1.5% and 0.1 cm, respectively. Conclusions: An eye phantom was developed and the performance was successfully validated. The phantom can be employed to verify the output and beam range for ocular proton therapy.

• 한국의학물리학회지:의학물리
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• 제21권1호
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• pp.60-69
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• 2010

전신 피부 전자선 치료(total skin electron beam therapy, TSET)를 위해서는 흔히 행해지는 일반적인 방사선 치료와 달리 치료 전 다양한 조건에서의 선량 측정과 더불어, 치료 중 지속적인 환자 신체부위별 선량 측정이 요구된다. 본 연구에서는 선형 가속기에 기반한 modified Stanford Technique으로 전신 피부 전자선 치료를 할 때 치료에 필요한 치료 전자선의 에너지와 선량의 공간적 분포 및 치료 중 환자의 각 부위별 조사선량을 EBT2 필름을 이용하여 측정 하였다. 전자선의 에너지는 이온전리함으로 측정한 값과 비교하였을 때 잘 일치하였고, 선량의 공간 분포 및 환자 각 신체부위에서의 선량 분포는 EBT2 필름을 이용하여 편리하게 측정할 수 있었다. 또한 TSET 치료중 EBT2 필름을 사용하여 in-vivo로 측정된 환자 신체 부위별 선량분포의 변화는 열형광선량계(thermoluminescent dosimeter, TLD)로 동시에 측정한 값과 비교하였을 때 잘 일치함을 알 수 있었다. 이로써 EBT2 필름의 전신 피부 전자선 치료를 위한 선량계로서의 가능성을 확인하였다.

• 한국의학물리학회:학술대회논문집
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• 한국의학물리학회 2002년도 Proceedings
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• pp.154-156
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• 2002

Brachytherapy has a long history in the treatment of cancer. However, the treatment planning technique for brachytherapy has lagged somewhat behind the corresponding developments for external beam therapy as far as the imaging technique is concerned. Currently, the orthogonal-film-based treatment planning is performed at most institutions even though the CT-based planning is available. The aim of this study is to evaluate the CT-based vs. the orthogonal-film-based treatment planning in cervix cancer. The doses to point A, point B, rectum and bladder points according to ICRU 38 were calculated for the two methods above. In addition, the volumetric studies such as 3D dose computation and DVH were obtained for the CT-based planning. For the bulky tumor, the isodose lines of point A prescription were not fairly covered for the CTV. The CT -based dose planning can overestimate the maximum dose delivered to bladder and rectum by 30%. The CT-based planning has several advantages over the orthogonal-film-based such as 3D dose display, DVH, and more accurate target delineation. It is suggested that the prescription point in cervix cancer be revised especially for the bulky tumor.

• 대한방사선치료학회:학술대회논문집
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• 대한방사선치료학회 2001년도 제21차 춘계 학술대회
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• pp.17-17
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• 2001

• 대한방사선치료학회지
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• 제12권1호
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• pp.126-133
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• 2000

• 대한방사선치료학회지
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• 제13권1호
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• pp.104-108
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• 2001